JP2019084571A - Built-up welding device - Google Patents

Abstract

To efficiently perform built-up welding of high quality at a low cost.SOLUTION: A built-up welding device has a welding wire supply portion which supports a plurality of rod-shaped welding wires 11 in parallel, and sends that in a longitudinal direction so as to bring a tip end 11a of each welding wire 11 close to each other; a welding wire heating portion which heats each welding wire 11; a laser irradiating portion which irradiates a laser L to a part where the tips 11a of the welding wires 11 approach each other; a moving portion which relatively moves each welding wire 11 and a base material subjected to built-in welding; and a control portion which controls the supply speed of each welding wire 11 at the welding wire supply portion, a heating temperature of each welding wire 11 at the welding wire heating portion, and the energy density of the laser L to each welding wire 11 at the laser irradiating portion.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a buildup welding apparatus.

  As a method for securing the corrosion resistance and friction resistance of a structure, it is known to apply build-up welding having the performance to the surface of the structure. In such a method, the material cost can be reduced by using an inexpensive material for the structure (base material). However, if the performance of the material of the structure is poor, there is a problem that the performance (quality) of the build-up welding is degraded if the dilution of the components of the structure is large and mixed in the build-up welding.

  Here, for example, in the welding device of Patent Document 1, it is described to combine a laser diode beam and a hot wire for the purpose of realizing high quality welding.

  Also, for example, in the overlay welding method of Patent Document 2, when supplying the weld material into the heat input region including the surface of the base material, the length of the heat input region in the width direction orthogonal to the traveling direction of the heat input region is It is described that the length of the heat input region on the surface of the base material is equal to or greater than the length in the width direction. Moreover, in patent document 2, using a several welding wire as a welding material is described.

International Publication No. 2010/123035 JP, 2015-139819, A

  By combining the laser diode beam and the hot wire disclosed in Patent Document 1, it is possible to suppress the dilution ratio of the component of the base material, and it is possible to improve the quality of overlay welding. On the other hand, it is conceivable to improve the construction efficiency by using a plurality of welding wires, and it can be expected to speed up the welding operation and reduce the manufacturing cost.

  However, even if a plurality of welding wires are used, the quality and construction efficiency of overlay welding may not be able to be improved depending on the molten state of each welding wire and the molten state of the base material. For example, in the cited reference 2, a configuration in which three welding wires are arranged side by side is shown, but simply by arranging a plurality of welding wires, the thickness of overlay welding applied by each welding wire is uniform. There is no indication on the conversion or equalization of the dilution rate of the base material.

  The present invention is intended to solve the above-mentioned problems, and it is an object of the present invention to provide a buildup welding apparatus capable of efficiently performing high quality buildup welding at low cost.

  In order to achieve the above-mentioned object, the build-up welding device according to one aspect of the present invention supports a plurality of rod-like welding wires arranged side by side, and has lengths so that the tips of the welding wires approach each other. Welding wire feeding unit for feeding in the direction, welding wire heating unit for heating each welding wire, laser irradiating unit for irradiating a laser to a portion where the tip of each welding wire is brought close to each other, each welding wire, A moving unit relatively moving the base material to be subjected to overlay welding, a supply speed of each welding wire in the welding wire supply unit, a heating temperature of each welding wire in the welding wire heating unit, and the laser irradiation And a control unit that controls the energy density of the laser to each of the welding wires in the unit.

  Further, in the build-up welding apparatus according to one aspect of the present invention, the control unit equally controls the supply speed of each welding wire with respect to the welding wire supply unit, and the welding wire heating unit of each welding wire. It is desirable to control the heating temperature equally.

  In the build-up welding apparatus according to one aspect of the present invention, it is preferable that the control unit equally control the energy density of the laser to each of the welding wires in the laser irradiation unit.

  In the build-up welding apparatus according to one aspect of the present invention, the laser irradiation unit has a moving mechanism that moves the laser along the direction in which the welding wires are arranged, and the control unit performs the laser irradiation It is desirable to equally control the power of the laser to each of the welding wires and to control the rate of movement of the lasers at each of the welding wires equally for each part.

  Further, in the build-up welding device according to one aspect of the present invention, the control unit controls the energy density of the laser to each of the welding wires equally for the laser irradiation unit when wrapping the side portion of the adjacent path. The heating speed of each welding wire is equally controlled for the welding wire heating part, and the feeding speed of the welding wire located in the lap part of the welding wire feeding part is the feeding speed of the welding wire located outside the lap part It is desirable to control more slowly.

  Further, in the buildup welding apparatus according to the aspect of the present invention, when the control unit wraps the side portion of the adjacent path, the energy density of the laser at the position of each welding wire is equal for the laser irradiation unit. Controlling the feed speed of each welding wire equally for the welding wire feeding part, and heating temperature of the welding wire located in the lap part for the welding wire heating part of the welding wire located outside the lap part It is desirable to control the temperature higher than the heating temperature.

  Further, in the build-up welding device according to one aspect of the present invention, the control unit equally controls the supply speeds of the welding wires with respect to the welding wire supply unit when the side portions of adjacent paths are wrapped. The heating temperature of each welding wire is equally controlled for the welding wire heating part, and the energy density of the laser to the welding wire located in the lap part for the laser irradiation part is the laser for the welding wire located outside the lap part It is desirable to control higher than the energy density of

  Further, in the build-up welding apparatus according to one aspect of the present invention, the laser irradiation unit has a moving mechanism that moves the laser along the parallel arrangement direction of the welding wires, and the control unit is an adjacent path When wrapping the side portion of the welding wire, the feeding speed of each welding wire is equally controlled for the welding wire feeding part, the heating temperature of each welding wire is equally controlled for the welding wire heating part, and each of the laser irradiation parts is The laser output power to the welding wire is equally controlled, and the moving speed of the laser at the position of the welding wire located at the lap portion is from the moving speed of the laser at the position of the welding wire located other than the lap portion. It is desirable to control too late.

  Further, in the build-up welding apparatus according to one aspect of the present invention, the laser irradiation unit has a moving mechanism that moves the laser along the parallel arrangement direction of the welding wires, and the control unit is an adjacent path When wrapping a part of the wire, the supply speed of each welding wire is controlled equally for the welding wire supply part, the heating temperature of each welding wire is equally controlled for the welding wire heating part, Equally controls the moving speed of the laser at the position of the welding wire, and controls the output of the laser to the welding wire located in the lap portion higher than the output of the laser to the welding wire located outside the lap portion It is desirable to do.

  Further, in the build-up welding apparatus according to one aspect of the present invention, the laser irradiation unit has a moving mechanism that moves the laser along the parallel arrangement direction of the welding wires, and the control unit is an adjacent path In the case where a part of the welding wire is to be wrapped, the feeding speed of each welding wire is equally controlled for the welding wire feeding part, the heating temperature of each welding wire is equally controlled for the welding wire heating part, and Controlling the moving speed of the laser at the position of the welding wire located at the portion slower than the moving speed of the laser at the position of the welding wire located at the position other than the lap portion; It is desirable to control the output of the laser at a higher value than the output of the laser to the welding wire located outside the lap portion.

  Further, in the build-up welding apparatus according to the aspect of the present invention, it is preferable that the laser irradiation unit is configured to irradiate the laser in a band shape in the arrangement direction of the welding wires.

  Further, in the build-up welding apparatus according to the aspect of the present invention, when a gap is formed between the tips of the welding wires, the control unit determines the energy density of the laser to the gap with respect to the laser irradiation unit. It is desirable to control the energy density of the laser to the welding wire less than that of the welding wire.

  According to the present invention, by arranging a plurality of welding wires in parallel, the width of the path in the arranging direction of the welding wires can be expanded, the construction time is shortened and the welding efficiency is improved, thereby reducing the manufacturing cost. can do. Moreover, according to the present invention, by making the tips of the plurality of welding wires close to each other, the dilution ratio of the base material in build-up welding is made uniform in the width of the pass, and corrosion resistance and friction resistance are sufficiently ensured. Quality can be improved. Moreover, according to the present invention, by bringing the tips of the plurality of welding wires close to each other, the thickness of the overlay welding can be made uniform uniformly in the width of the path, and the corrosion resistance and friction resistance are sufficiently ensured. Can be improved.

FIG. 1 is a block diagram of a buildup welding apparatus according to an embodiment of the present invention. FIG. 2: is a block diagram of the welding wire supply part in the build-up welding apparatus which concerns on embodiment of this invention. FIG. 3 is a conceptual view of overlay welding performed by the overlay welding apparatus according to the embodiment of the present invention. FIG. 4 is a conceptual view showing the operation of the buildup welding apparatus according to the embodiment of the present invention. FIG. 5 is a conceptual view of overlay welding performed by the overlay welding apparatus according to the embodiment of the present invention. FIG. 6 is a conceptual view showing the operation of the build-up welding apparatus according to the embodiment of the present invention. FIG. 7 is a conceptual view showing the operation of the buildup welding apparatus according to the embodiment of the present invention. FIG. 8 is a conceptual view showing the operation of the build-up welding apparatus according to the embodiment of the present invention. FIG. 9 is a conceptual view showing the operation of the buildup welding apparatus according to the embodiment of the present invention. FIG. 10 is a conceptual view showing the operation of the buildup welding apparatus according to the embodiment of the present invention. FIG. 11 is a conceptual view showing the operation of the build-up welding apparatus according to the embodiment of the present invention. FIG. 12 is a conceptual view showing a laser irradiation form of the laser irradiation part in the build-up welding apparatus according to the embodiment of the present invention. FIG. 13 is a conceptual view showing a laser irradiation form of the laser irradiation part in the build-up welding apparatus according to the embodiment of the present invention.

  Hereinafter, embodiments according to the present invention will be described in detail based on the drawings. The present invention is not limited by this embodiment. In addition, constituent elements in the following embodiments include those that can be easily replaced by persons skilled in the art or those that are substantially the same.

Embodiment 1
FIG. 1 is a block diagram of a buildup welding apparatus according to the present embodiment. FIG. 2: is a block diagram of the welding wire supply part in the overlay welding apparatus which concerns on this embodiment.

  As shown in FIG. 1, in the build-up welding apparatus according to this embodiment, a base material holding unit 1, a welding wire supply unit 2, a welding wire heating unit 3, a laser irradiation unit 4, a moving unit 5, and control And 6.

  The base material holding portion 1 holds a base material 10 to be subjected to build-up welding.

  The welding wire supply unit 2 supports the rod-like welding wire 11 and feeds the tip end of the welding wire 11 toward the base material 10 in the longitudinal direction. The welding wire supply unit 2 has a support mechanism 2A, a delivery mechanism 2B, and a head 2C. The support mechanism 2A rotatably supports the reel 12 on which the rod-like welding wire 11 is wound. The delivery mechanism 2 B pulls the welding wire 11 wound around the reel 12 from the reel 12 and delivers it along the length direction. The head 2C penetrates the welding wire 11 delivered by the delivery mechanism 2B along the length direction, and supports the welding wire 11 movably in the length direction. The head 2 </ b> C is disposed in the vicinity of the base material holding portion 1 and supports the tip of the welding wire 11 toward the base material 10. In addition, the cross section of the welding wire 11 is formed in a circular shape, an elliptical shape, a rectangular shape, or the like.

  The welding wire supply part 2 is provided with two or more. In FIG. 2, the structure in which the three welding wire supply parts 2 were provided is shown. In FIG. 2, the support mechanism 2A and the delivery mechanism 2B are omitted, and a part of the tip side of the head 2C (2Ca, 2Cb, 2Cc) is shown. In this configuration, each head 2C (2Ca, 2Cb, 2Cc) supports a plurality of rod-like welding wires 11 in parallel, and is disposed so that the tips 11a of the welding wires 11 approach each other. And in this embodiment, each welding wire 11 sent from each head 2C (2Ca, 2Cb, 2Cc) contacts the tip 11a which mutually approached in a welding position (position to which laser L is irradiated). There is.

  The welding wire heating unit 3 heats the welding wire 11. The welding wire heating unit 3 has a power supply unit 3A. The power supply unit 3A brings the welding wire 11 into a semi-molten state by supplying power to the welding wire 11 (head 2C). The semi-molten state refers to a state in which the welding wire 11 is easily melted by heating, and in a state in which the shape is maintained so that it can be delivered from the head 2C.

  In the present embodiment, as described above, a plurality of welding wire supply units 2 are provided. For this reason, the welding wire heating part 3 is provided corresponding to each welding wire supply part 2, and heats each welding wire 11, respectively.

  The laser irradiation unit 4 irradiates a laser to a portion of the tip 11 a of the welding wire 11. The laser irradiation unit 4 has a laser oscillator 4A and a laser irradiation head 4B. The laser oscillator 4A emits a laser L which has a predetermined output. The laser irradiation head 4B is connected to the laser oscillator 4A via the transmission cable, and irradiates the laser L guided by the transmission cable toward the base material 10.

  In the present embodiment, as described above, a plurality of welding wire supply units 2 are provided. For this reason, the laser irradiation part 4 irradiates the laser L to the site | part to which the front-end | tip 11a was approached mutually of each welding wire 11. As shown in FIG. Specifically, in FIG. 2, the laser irradiation unit 4 irradiates a laser having a beam diameter larger than the diameter of one welding wire 11 (for example, the diameter of one welding wire 11 is φ 1.2 mm and the beam diameter is φ 2 .0 mm). And as shown in FIG. 1, the laser irradiation part 4 has the moving mechanism 4C which moves this laser L along the parallel arrangement direction (arrow A direction of FIG. 2) of each welding wire 11. As shown in FIG. The moving mechanism 4C moves the laser irradiation head 4B. Further, in the moving mechanism 4C, the laser irradiation head 4B of the laser irradiation unit 4 has a laser optical system, and the laser irradiation head 4B is changed by changing the direction and focal length of the optical axis of the laser L by an optical system such as a mirror. It may be possible to scan the laser L without moving it.

  The moving unit 5 moves the welding wire 11 and the base material 10 relative to each other. In the present embodiment, the moving unit 5 is provided in the base material holding unit 1 that holds the base material 10, and moves the base material holding unit 1 along three axis directions of X axis, Y axis, and Z axis orthogonal to each other. It is configured to be possible.

  In the present embodiment, as described above, a plurality of welding wire supply units 2 are provided. Therefore, the moving unit 5 moves the welding wires 11 relative to the base material 10 together. For example, as shown in FIG. 2, in the build-up welding apparatus of the present embodiment, each moving welding wire 11 is relatively moved in the direction of arrow B by moving the base material holding unit 1 by the moving unit 5. Overlay welding can be performed in one pass, and furthermore, each welding wire 11 is relatively moved in the direction of arrow C and then moved in the direction of arrow B to make the paths adjacent and perform overlay welding it can.

  The control unit 6 controls the operation of the buildup welding apparatus. The control unit 6 is, for example, a computer, and is realized by an arithmetic processing unit, a storage unit, or the like. The arithmetic processing unit includes a microprocessor such as a CPU (Central Processing Unit). The storage device includes memory and storage such as ROM and RAM. The arithmetic processing unit performs arithmetic processing in accordance with a computer program stored in the storage device.

  The control unit 6 controls the operations of the delivery mechanism 2B of the welding wire supply unit 2, the welding wire heating unit 3, the laser oscillator 4A and the moving mechanism 4C of the laser irradiation unit 4, and the moving unit 5. Specifically, the control unit 6 controls the delivery mechanism 2B of each welding wire supply unit 2 to change the supply speed of each welding wire 11. Further, the control unit 6 controls each welding wire heating unit 3 to change the heating temperature of each welding wire 11. Further, the control unit 6 controls the laser oscillator 4A of the laser irradiation unit 4 to change the output of the laser L. Further, the control unit 6 controls the moving mechanism 4C of the laser irradiation unit 4 to change the moving speed of the laser L. Further, the control unit 6 controls the moving unit 5 to move the welding wires 11 and the base material 10 relative to each other.

  FIG. 3 is a conceptual view of overlay welding performed by the overlay welding apparatus according to the present embodiment.

  As shown in FIG. 3, the weld overlay 13 is applied to the surface of the base material 10 and the weld on the surface of the base material 10 together with the weld overlay 11A where the welding wire 11 is melted and the weld overlay 11A. The base material fusion zone 10A is diluted. The weld overlay 11A (welding wire 11) is made of, for example, a material having corrosion resistance and friction resistance. On the other hand, base material fusion zone 10A (base material 10) is made of an inexpensive material having low corrosion resistance and low friction resistance, and contributes to reduction of manufacturing cost. However, if unevenness occurs in the dilution ratio of the base material fusion zone 10A to the weld overlay weld zone 11A, the corrosion resistance and friction resistance performance possessed by the weld overlay weld zone 11A (welding wire 11) can not be secured sufficiently and the quality decreases. Tend to The dilution ratio is calculated by the following equation (1), with the thickness α of the weld overlay 11A and the thickness β of the base melt 10A.

  Dilution rate% = [β / (α + β)] · 100 (1)

  Further, by arranging the plurality of welding wires 11 in parallel, the width W of the path in the arranging direction of the welding wires 11 can be expanded, and the construction time is shortened to improve the welding efficiency, thereby reducing the manufacturing cost. . However, even if a plurality of welding wires 11 are simply juxtaposed, unevenness occurs in the thickness of the weld overlay 13 in the width W of the pass, and the corrosion resistance and friction resistance of the weld overlay 11A (welding wire 11) However, the quality tends to deteriorate.

  With respect to these problems, according to the overlay welding apparatus of the present embodiment, by making the tips 11a of the plurality of welding wires 11 approach each other, the dilution ratio of the base material 10 in the overlay welding 13 is obtained in the width W of the pass. It can be made uniform and quality can be improved. Moreover, according to the build-up welding apparatus of the present embodiment, by bringing the tips 11a of the plurality of welding wires 11 close to each other, the thickness of the build-up weld 13 can be made uniform and uniform in the width W of the pass. can do.

  FIG. 4 is a conceptual view showing the operation of the buildup welding apparatus according to the present embodiment.

  FIG. 4 is an operation of performing overlay welding shown in FIG. 3 and illustrates control of the control unit 6. Here, the diameters (cross-sectional shape and cross-sectional area) of the welding wires 11 in the welding wire supply unit 2 are the same. In addition, that the diameter of each welding wire 11 is the same includes that there may be a manufacturing error in the welding wire 11, and the same applies to the other embodiments.

  The control unit 6 controls the welding wire heating unit 3 to heat each welding wire 11. Further, the control unit 6 controls the laser oscillator 4A of the laser irradiation unit 4 to irradiate the laser L. Further, the control unit 6 controls the moving mechanism 4C of the laser irradiation unit 4 to move the laser L to the position of each welding wire 11 in the movement range M shown in FIG. That is, each welding wire 11 is accompanied by the surface of the base material 10 by irradiating each welding wire 11 in the semi-molten state with the laser L and moving the laser L along the direction in which the welding wires 11 are arranged. It melts and is applied to the surface of the base material 10 as overlay welding 13. Furthermore, the control unit 6 controls the feeding mechanism 2B of the welding wire feeding unit 2 to feed each welding wire 11, and controls the moving unit 5 to relatively move each welding wire 11 and the base material 10. Thereby, build-up welding 13 of width W of a pass is continuously given by the length of the arrow B direction.

  Then, as shown in FIG. 4, the control unit 6 controls the welding wire supply unit 2 so that the supply speeds Va of feeding the respective welding wires 11 become equal. Further, the control unit 6 controls the welding wire supply unit 2 so that the supply speed Va for feeding each welding wire 11 becomes constant.

  Furthermore, the control unit 6 controls the welding wire heating unit 3 so that the heating temperatures T of the respective welding wires 11 become equal. Further, the control unit 6 controls the welding wire heating unit 3 so that the heating temperature T of each welding wire 11 becomes constant.

  That is, by sending each welding wire 11 at the same feed rate Va and heating it at the same heating temperature T, the molten state of each welding wire 11 and the base material 10 becomes equal, whereby the width W of the path and the continuity It is possible to make the dilution rate of the base material 10 in the buildup welding 13 uniform in the direction, and to make the thickness of the buildup welding 13 uniform. As a result, it is possible to improve the quality by sufficiently securing the corrosion resistance ability and the friction resistance ability in the overlay welding 13.

  Moreover, since the melting of the welding wire 11 is promoted by heating each welding wire 11, it is possible to reduce the dilution rate of the base material melting portion 10A to the buildup melting portion 11A. The base material fusion zone 10A (base material 10) can contribute to reduction of manufacturing cost by using an inexpensive material having low corrosion resistance and friction resistance performance, but the base material fusion zone to the weld overlay zone 11A If the dilution rate of 10A is high (for example, more than 20%), the corrosion resistance and the friction resistance possessed by the weld overlay 11A (welding wire 11) can not be sufficiently ensured, and the quality tends to be lowered. For this reason, the quality can be further ensured by reducing the dilution ratio of the base material melting portion 10A to the build-up melting portion 11A as much as possible (for example, about 5%).

  Further, it is desirable that the control unit 6 controls the laser irradiation unit 4 so that the energy density Q of the laser L to each welding wire 11 becomes equal. Specifically, the control unit 6 controls the laser irradiation unit 4 so that the output P of the laser to each welding wire 11 is equal, and the moving speed Vb of the laser L at the position of each welding wire 11 is equal. Control to be The energy density Q of the laser L is obtained by Q = P / Vb.

  That is, by welding each welding wire 11 with equal energy density Q, the molten state of each welding wire 11 and base material 10 becomes equal, and thereby, the base material in overlay welding 13 in the width W of the path and the continuous direction The dilution ratio of 10 can be made uniform, and the thickness of the weld overlay 13 can be made uniform. As a result, it is possible to improve the quality by sufficiently securing the corrosion resistance ability and the friction resistance ability in the overlay welding 13.

Second Embodiment
FIG. 5 is a conceptual view of overlay welding performed by the overlay welding apparatus according to the present embodiment.

  The overlay welding 13 shown in FIG. 5 includes overlay welding 13A of the previous pass and overlay welding 13B of the subsequent pass adjacent to overlay welding 13A of the previous pass. The overlay welding 13A of the previous pass corresponds to the overlay welding 13 shown in FIG. The rear pass overlay welding 13B is applied by wrapping the side portion adjacent to the forward pass overlay welding 13A on the side of the forward pass overlay welding 13A. In this way, the overlay welding 13A of the first pass and the overlay welding 13B of the second pass can be applied continuously without leaving a gap.

  6-9 is a conceptual diagram which shows operation | movement of the build-up-welding apparatus which concerns on this embodiment.

  FIGS. 6-9 is operation | movement which performs build-up welding 13B of the pass after shown in FIG. 5, Comprising: It shows about control of the control part 6. FIG. Here, the diameters (cross-sectional shape and cross-sectional area) of the welding wires 11 in the welding wire supply unit 2 are the same.

  The control unit 6 controls the welding wire heating unit 3 to heat each welding wire 11. Further, the control unit 6 controls the laser oscillator 4A of the laser irradiation unit 4 to irradiate the laser L. Further, the control unit 6 controls the moving mechanism 4C of the laser irradiation unit 4 to move the laser L to the position of each welding wire 11 within the movement range M shown in FIGS. That is, each welding wire 11 is accompanied by the surface of the base material 10 by irradiating each welding wire 11 in the semi-molten state with the laser L and moving the laser L along the direction in which the welding wires 11 are arranged. It melts and is applied to the surface of the base material 10 as overlay welding 13B of a later pass. Furthermore, the control unit 6 controls the feeding mechanism 2B of the welding wire feeding unit 2 to feed each welding wire 11, and controls the moving unit 5 to relatively move each welding wire 11 and the base material 10. Thereby, build-up welding 13B of the pass after width W of a pass is continuously given by the length of the arrow B direction.

  Then, in the operation shown in FIG. 6, the control unit 6 controls the laser irradiation unit 4 so that the energy density Q of the laser L to each welding wire 11 becomes equal. Specifically, the control unit 6 controls the laser irradiation unit 4 so that the output P of the laser to each welding wire 11 is equal, and the moving speed Vb of the laser L at the position of each welding wire 11 is equal. Control to be

  Further, as shown in FIG. 6, the control unit 6 controls the welding wire heating unit 3 so that the heating temperatures T of the respective welding wires 11 become equal. Further, the control unit 6 controls the welding wire heating unit 3 so that the heating temperature T of each welding wire 11 becomes constant.

  Further, as shown in FIG. 6, the control unit 6 makes the supply speed Va of the welding wire 11 located in the lap part of the welding wire supply part 2 slower than the supply speed Va of the welding wire 11 located outside the lap part. To control. Further, the control unit 6 controls the welding wire supply unit 2 so that the supply speed Va for feeding each welding wire 11 becomes constant.

  That is, in the operation shown in FIG. 6, the welding wire 11 located at the wrap portion is fed at a slower supply speed Va than the welding wire 11 located at other than the wrap portion, whereby the supply amount of welding wire 11 located at the wrap portion However, it is less than the welding wire 11 located outside the lap portion. For this reason, in the build-up welding 13B of the later pass, the build-up melted portion 11A of the welding wire 11 in the wrap portion becomes smaller than other than the wrap portion. As a result, heat can sufficiently be transmitted at the contact point D between the overlay welding 13A of the previous pass and the overlay welding 13B of the later pass shown in FIG. 5, so that the overlay welding 13A of the base material 10 and the earlier pass is performed. It is possible to prevent the poor fusion to the welding and fix the build-up welding 13B of the later pass, and the quality can be improved. Moreover, in the subsequent pass overlay welding 13B, the thickness of the overlay welding portion 11A in the lap portion can be reduced, and the thickness of the overlay welding 13 can be made uniform and uniform in the width W of the pass. Can.

  Further, in the operation shown in FIG. 7, the control unit 6 controls the laser irradiation unit 4 so that the energy density Q of the laser L to each welding wire 11 becomes equal. Specifically, the control unit 6 controls the laser irradiation unit 4 so that the output P of the laser to each welding wire 11 is equal, and the moving speed Vb of the laser L at the position of each welding wire 11 is equal. Control to be

  Further, as shown in FIG. 7, the control unit 6 controls the welding wire supply unit 2 so that the supply speeds Va of feeding the respective welding wires 11 become equal. Further, the control unit 6 controls the welding wire supply unit 2 so that the supply speed Va for feeding each welding wire 11 becomes constant.

  Further, as shown in FIG. 7, the control unit 6 makes the heating temperature T of the welding wire 11 located in the lap portion of the welding wire heating portion 3 higher than the heating temperature T of the welding wire 11 located outside the lap portion. To control. Further, the control unit 6 controls the welding wire heating unit 3 so that the heating temperature T of each welding wire 11 becomes constant.

  That is, in the operation shown in FIG. 7, welding wire 11 located in the wrap portion is heated by heating welding wire 11 located in the wrap portion to a higher heating temperature T than welding wire 11 located outside the wrap portion, It melts faster than the welding wire 11 located other than a lap | wrap part. As a result, heat can sufficiently be transmitted at the contact point D between the overlay welding 13A of the previous pass and the overlay welding 13B of the later pass shown in FIG. 5, so that the overlay welding 13A of the base material 10 and the earlier pass is performed. It is possible to prevent the poor fusion to the welding and fix the build-up welding 13B of the later pass, and the quality can be improved. Moreover, in the subsequent pass overlay welding 13B, melting in the lap portion is promoted, so that the thickness of the overlay welding portion 11A can be reduced, and the thickness of the overlay welding 13 is uniform uniformly in the width W of the pass. To improve the quality.

  Further, in the operation shown in FIG. 8, the control unit 6 controls the welding wire supply unit 2 so that the supply speeds Va of feeding the respective welding wires 11 become equal. Further, the control unit 6 controls the welding wire supply unit 2 so that the supply speed Va for feeding each welding wire 11 becomes constant.

  Further, as shown in FIG. 8, the control unit 6 controls the welding wire heating unit 3 so that the heating temperatures T of the respective welding wires 11 become equal. Further, the control unit 6 controls the welding wire heating unit 3 so that the heating temperature T of each welding wire 11 becomes constant.

  In addition, as shown in FIG. 8, the control unit 6 controls the energy density Q of the laser L directed to the welding wire 11 positioned at the lap portion of the laser irradiating portion 4 by the laser L directed to the welding wire 11 positioned other than the lap portion. Control is made to be higher than the energy density Q. Specifically, the control unit 6 controls the laser irradiation unit 4 so that the laser output P to each welding wire 11 becomes equal, and the movement of the laser L at the position of the welding wire 11 located in the lap portion The velocity Vb is controlled to be slower than the moving velocity Vb of the laser L at the position of the welding wire 11 located outside the lap portion.

  That is, in the operation shown in FIG. 8, the welding wire 11 located at the lap portion is irradiated with the laser L having an energy density Q higher than that of the welding wire 11 located at other than the lap portion. The wire 11 melts faster than the welding wire 11 located outside the wrap. As a result, heat can sufficiently be transmitted at the contact point D between the overlay welding 13A of the previous pass and the overlay welding 13B of the later pass shown in FIG. 5, so that the overlay welding 13A of the base material 10 and the earlier pass is performed. It is possible to prevent the poor fusion to the welding and fix the build-up welding 13B of the later pass, and the quality can be improved. Moreover, in the subsequent pass overlay welding 13B, melting in the lap portion is promoted, so that the thickness of the overlay welding portion 11A can be reduced, and the thickness of the overlay welding 13 is uniform uniformly in the width W of the pass. To improve the quality.

  Further, in the operation shown in FIG. 9, the control unit 6 controls the welding wire supply unit 2 so that the supply speeds Va of feeding the welding wires 11 become equal. Further, the control unit 6 controls the welding wire supply unit 2 so that the supply speed Va for feeding each welding wire 11 becomes constant.

  Further, as shown in FIG. 9, the control unit 6 controls the welding wire heating unit 3 so that the heating temperatures T of the respective welding wires 11 become equal. Further, the control unit 6 controls the welding wire heating unit 3 so that the heating temperature T of each welding wire 11 becomes constant.

  Further, as shown in FIG. 9, the control unit 6 controls the energy density Q of the laser L directed to the welding wire 11 located at the lap portion of the laser irradiating portion 4 by the laser L directed to the welding wire 11 located outside the lap portion. Control is made to be higher than the energy density Q. Specifically, the control unit 6 controls the laser irradiation unit 4 so that the moving speeds Vb of the laser L at the positions of the welding wires 11 become equal, and the laser L to the welding wire 11 located in the lap portion The power P of the laser is controlled to be higher than the power P of the laser to the welding wire 11 located outside the lap portion.

  That is, in the operation shown in FIG. 9, the welding wire 11 located at the lap portion is irradiated with the laser L having an energy density Q higher than that of the welding wire 11 located at other than the lap portion. The wire 11 melts faster than the welding wire 11 located outside the wrap. As a result, heat can sufficiently be transmitted at the contact point D between the overlay welding 13A of the previous pass and the overlay welding 13B of the later pass shown in FIG. 5, so that the overlay welding 13A of the base material 10 and the earlier pass is performed. It is possible to prevent the poor fusion to the welding and fix the build-up welding 13B of the later pass, and the quality can be improved. Moreover, in the subsequent pass overlay welding 13B, melting in the lap portion is promoted, so that the thickness of the overlay welding portion 11A can be reduced, and the thickness of the overlay welding 13 is uniform uniformly in the width W of the pass. To improve the quality.

  Further, although not clearly shown in the figure, the control unit 6 combines the operations shown in FIG. 8 and FIG. 9 and wraps the moving speed Vb of the laser L at the position of the welding wire 11 located in the wrap portion for the laser irradiation portion 4 Control to be slower than the moving speed Vb of the laser L at the position of the welding wire 11 located outside the part, and the output P of the laser L to the welding wire 11 located in the lapping part is located outside the lapping part By controlling so that the output P of the laser L to the welding wire 11 becomes higher, the energy density Q of the laser L to the welding wire 11 located in the lap portion is a laser for the welding wire 11 located outside the lap portion It may be controlled to be higher than the energy density Q of L.

  That is, even in the case where the operations shown in FIGS. 8 and 9 are combined, the laser L having an energy density Q higher than that of the welding wire 11 located other than the lap is irradiated to the welding wire 11 located in the lap. Then, the welding wire 11 located in the lap part melts faster than the welding wire 11 located in other than the lap part. As a result, heat can sufficiently be transmitted at the contact point D between the overlay welding 13A of the previous pass and the overlay welding 13B of the later pass shown in FIG. 5, so that the overlay welding 13A of the base material 10 and the earlier pass is performed. It is possible to prevent the poor fusion to the welding and fix the build-up welding 13B of the later pass, and the quality can be improved. Moreover, in the subsequent pass overlay welding 13B, melting in the lap portion is promoted, so that the thickness of the overlay welding portion 11A can be reduced, and the thickness of the overlay welding 13 is uniform uniformly in the width W of the pass. To improve the quality.

  Although not explicitly shown in the drawing, the diameter (the cross-sectional shape and the cross-sectional area) of the welding wire 11 located in the wrap in the welding wire supply unit 2 may be thinner than the welding wire 11 located outside the wrap.

  In this case, the control unit 6 controls the laser irradiation unit 4 so that the energy density Q of the laser L to each welding wire 11 becomes equal. Specifically, the control unit 6 controls the laser irradiation unit 4 so that the output P of the laser to each welding wire 11 is equal, and the moving speed Vb of the laser L at the position of each welding wire 11 is equal. Control to be

  Further, the control unit 6 controls the welding wire supply unit 2 so that the supply speeds Va of feeding the respective welding wires 11 become equal. Further, the control unit 6 controls the welding wire supply unit 2 so that the supply speed Va for feeding each welding wire 11 becomes constant.

  Further, the control unit 6 controls the welding wire heating unit 3 so that the heating temperatures T of the respective welding wires 11 become equal. Further, the control unit 6 controls the welding wire heating unit 3 so that the heating temperature T of each welding wire 11 becomes constant.

  That is, by making the diameter of the welding wire 11 located in the wrap smaller than that of the welding wire 11 located outside the wrap, the supply amount of the welding wire 11 located in the wrap is a welding wire located outside the wrap Less than 11 For this reason, in the build-up welding 13B of the later pass, the build-up melted portion 11A of the welding wire 11 in the wrap portion becomes smaller than other than the wrap portion. As a result, heat can sufficiently be transmitted at the contact point D between the overlay welding 13A of the previous pass and the overlay welding 13B of the later pass shown in FIG. 5, so that the overlay welding 13A of the base material 10 and the earlier pass is performed. It is possible to prevent the poor fusion to the welding and fix the build-up welding 13B of the later pass, and the quality can be improved. Moreover, in the subsequent pass overlay welding 13B, the thickness of the overlay welding portion 11A in the lap portion can be reduced, and the thickness of the overlay welding 13 can be made uniform and uniform in the width W of the pass. Can.

Third Embodiment
10 and 11 are conceptual views showing the operation of the build-up welding apparatus according to the present embodiment.

  FIG. 10 and FIG. 11 show the control of the control section 6 in the operation of performing the overlay welding 13 of the pass shown in FIG. Here, the diameters (cross-sectional shape and cross-sectional area) of the welding wires 11 in the welding wire supply unit 2 are the same.

  As shown in FIGS. 10 and 11, in the welding wire supply unit 2, a gap H is formed between the tips 11 a of the welding wires 11. The clearance H is smaller than the diameter of each welding wire 11.

  In this case, as shown in FIG. 10 and FIG. 11, the control unit 6 causes the energy density Q of the laser L to the gap H in the laser irradiation unit 4 to be smaller than the energy density Q of the laser L to the welding wire 11 Control. Specifically, as shown in FIG. 10, the control unit 6 controls the laser irradiation unit 4 so that the gap H and the laser output P to each welding wire 11 become equal, and at the position of the gap H The moving speed Vb of the laser L is controlled to be faster than the moving speed Vb of the laser L at the position of each welding wire 11. Alternatively, as shown in FIG. 11, the control unit 6 controls the laser irradiation unit 4 so that the moving speed Vb of the laser L at the position of the gap H and each welding wire 11 becomes equal, and the laser to the gap H The output P of L is controlled to be lower than the output P of the laser to each welding wire 11. Or although not clearly shown in the figure, the control unit 6 combines the operations shown in FIG. 10 and FIG. 11 so that the moving speed Vb of the laser L at the position of the gap H for the laser irradiating unit 4 at the position of the welding wire 11 The control may be made to be faster than the moving speed Vb of the laser L, and the output P of the laser L to the gap H may be controlled to be lower than the output P of the laser L to the welding wire 11.

  That is, according to the build-up welding device of the present embodiment, the width W of the path shown in FIG. 3 can be expanded by providing the gap H between the tips 11a of the welding wires 11, thereby shortening the construction time and welding By improving the efficiency, the manufacturing cost can be reduced. Moreover, in the operation shown in FIGS. 10 and 11, the laser beam L of low energy density Q is irradiated to the gap H with respect to the welding wire 11, whereby the gap H, ie, the surface of the base material 10 has low energy density Q The laser L is to be irradiated. Thereby, the melting of the base material 10 in the gap H where the welding wire 11 does not exist is reduced, so that the dilution rate of the base material 10 in the overlay welding 13 can be made uniform in the width W of the pass to improve the quality. it can.

  In addition, when the clearance gap H is formed in the welding wire supply part 2 between the front-ends 11a of each welding wire 11 by combining with the operation | movement shown in FIG.10 and FIG.11 and the operation | movement shown in FIGS. In addition to the above effects, the quality of the overlay welding 13B of the subsequent pass shown in FIG. 5 can be improved.

Fourth Embodiment
FIG. 12 and FIG. 13 are conceptual diagrams showing a laser irradiation form of the laser irradiation part in the build-up welding apparatus according to the present embodiment.

  In the form shown in FIG. 12, the laser irradiation part 4 is comprised so that the laser L may be irradiated in strip shape over the parallel arrangement direction of each welding wire 11 by the laser optical system of the laser irradiation head 4B. In this case, the position of the laser L irradiated with respect to each welding wire 11 of the laser irradiation part 4 is fixing. The control unit 6 can control the laser irradiation unit 4 so as to change the power density of the laser L by changing the output of the laser L in the direction in which the welding wires 11 are juxtaposed, as shown in FIGS. The operations shown in FIGS. 9 and 11 can be performed, and the above effects can be obtained.

  In the embodiment shown in FIG. 13, a plurality of laser irradiation units 4 are provided to irradiate the position of each welding wire 11 with the laser L. In this case, the position of the laser L irradiated with respect to each welding wire 11 of the laser irradiation part 4 is fixing. The control unit 6 can control the laser irradiation unit 4 to change the output of each laser L to change the energy density of the laser L, thereby performing the operations shown in FIG. 6, FIG. 7, and FIG. And the above effects can be obtained.

DESCRIPTION OF SYMBOLS 1 base material holding part 2 welding wire supply part 2A support mechanism 2B delivery mechanism 2C head 3 welding wire heating part 3A power supply part 4 laser irradiation part 4A laser oscillator 4B laser irradiation head 4C moving mechanism 5 movement part 6 control part 10 base material 10A Base material fusion zone 11 welding wire 11a tip 11A overlay welding zone 12 reel 13 overlay welding 13A overlay welding of the previous pass overlay welding pass 13B H gap L laser P power Q energy density T heating temperature Va supply Speed Vb Movement speed W Path width

Claims (12)

A welding wire supply unit for supporting a plurality of rod-like welding wires in parallel and feeding the tips of the welding wires in the longitudinal direction so that the tips of the welding wires approach each other;
A welding wire heating unit for heating each of the welding wires;
A laser irradiator for irradiating a laser to a portion of each of the welding wires whose tips are brought close to each other;
A moving unit for relatively moving each of the welding wires and a base material to be subjected to overlay welding;
A control unit that controls a supply speed of each welding wire in the welding wire supply unit, a heating temperature of each welding wire in the welding wire heating unit, and an energy density of a laser to each welding wire in the laser irradiation unit ,
Overlay welding device.   The overlay welding according to claim 1, wherein the control unit equally controls the supply speed of each of the welding wires for the welding wire supply unit, and equally controls the heating temperature of each of the welding wires for the welding wire heating unit. apparatus.   The overlay welding apparatus according to claim 2, wherein the control unit equally controls the energy density of the laser to each of the welding wires for the laser irradiation unit.   The laser irradiator has a moving mechanism for moving the laser along the direction in which the welding wires are juxtaposed, and the control unit controls the laser irradiators to control the output of the laser to the welding wires equally. The overlay welding apparatus according to claim 2, wherein the moving speeds of the laser at the positions of the welding wires are equally controlled.   The control unit equally controls the energy density of the laser to each welding wire with respect to the laser irradiation unit when the side portions of adjacent paths are wrapped, and the heating temperature of each welding wire with respect to the welding wire heating unit The overlay welding apparatus according to claim 1, wherein the welding wire supply unit controls the welding speed of the welding wire positioned at the lap with respect to the welding wire supply unit more slowly than the welding speed of the welding wire positioned at other than the lap. .   The control unit equally controls the energy density of the laser at the position of each welding wire with respect to the laser irradiation unit when the side portions of adjacent paths are wrapped, and supplies the welding wire with respect to the welding wire supply unit. The overlay according to claim 1, wherein the speed is equally controlled, and the heating temperature of the welding wire located in the lap portion of the welding wire heating portion is controlled higher than the heating temperature of the welding wire located outside the lap portion. Welding equipment.   The control unit equally controls the supply speed of each welding wire with respect to the welding wire supply unit and equally controls the heating temperature of each welding wire with respect to the welding wire heating unit, when the side portions of adjacent paths are wrapped. The meat according to claim 1, wherein the energy density of the laser to the welding wire located in the lap portion of the laser irradiation portion is controlled to be higher than the energy density of the laser to the welding wire located outside the lap portion. Fill welding equipment.   The laser irradiation unit has a moving mechanism for moving the laser along the direction in which the welding wires are juxtaposed, and when the control unit wraps the side portion of the adjacent path, each of the welding wire supply units The feeding speed of the welding wire is equally controlled, the heating temperature of each welding wire is equally controlled for the welding wire heating section, the laser output to each welding wire is equally controlled for the laser irradiation section, and the lap is The overlay welding apparatus according to claim 1, wherein the moving speed of the laser at the position of the welding wire located in the section is controlled slower than the moving speed of the laser at the position of the welding wire located other than the lap section.   The laser irradiation unit has a moving mechanism for moving the laser along the direction in which the welding wires are juxtaposed, and when the control unit wraps a part of adjacent paths, each of the welding wire supply units The feeding speed of the welding wire is equally controlled, the heating temperature of each welding wire is equally controlled for the welding wire heating section, and the moving speed of the laser at the position of each welding wire is equally controlled for the laser irradiating section. The buildup welding apparatus according to claim 1, wherein the output of the laser to the welding wire positioned in the lap portion is controlled to be higher than the output of the laser to the welding wire positioned other than the lap portion.   The laser irradiation unit has a moving mechanism for moving the laser along the direction in which the welding wires are juxtaposed, and when the control unit wraps a part of adjacent paths, each of the welding wire supply units The feeding speed of the welding wire is controlled equally, the heating temperature of each welding wire is equally controlled for the welding wire heating part, and the moving speed of the laser at the position of the welding wire located in the lap part for the laser irradiation part Is controlled to be slower than the moving speed of the laser at the position of the welding wire located outside the lap portion, and the output of the laser to the welding wire located in the lap portion is the welding wire located outside the lap portion The overlay welding apparatus according to claim 1, wherein the control is performed higher than the output of the laser.   The overlay welding apparatus according to any one of claims 1 to 3 and 5 to 7, wherein the laser irradiation unit is configured to irradiate the laser in a band shape along the direction in which the welding wires are arranged in parallel. .   The control unit controls the energy density of the laser to the gap smaller than the energy density of the laser to the welding wire, when the gap is formed between the tips of the welding wires. The overlay welding apparatus according to any one of claims 1 to 11.

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