JP2000158162A - Method and device for laser cut welding - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain an excellent welding quality without deteriorating a welding velocity. SOLUTION: In this device, a cutting light condensed beam, wherein the cutting laser beams outputted from a cutting laser oscillator 13 are condensed, is radiated to end parts of one metallic plate and the other metallic plate nipped between first and second clamp parts 1 and 2 while a cut welding torch 20 is moved so as to cut the metallic plates. The second clamp part 2 is moved on the first clamp 1 side, so as to butt end faces of the metallic plates after cutting. A welding light condensed beam, wherein the welding laser beams outputted from a welding laser oscillator 14 are condensed, is radiated to the butt part of the metallic plates while the cut welding torch 20 is moved, so as to perform welding. At that time, while the light condensed beam, wherein the cutting laser beams are condensed, is radiated to the butt part for pre- heating, the welding light condensed beam is radiated for performing welding.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a laser cutting welding method and a laser cutting method in which the end faces of a laser cut metal plate are butted and the butted portion is laser welded.

[0002]

2. Description of the Related Art In a rolling line for a steel plate or the like, in order to continuously perform rolling, the leading end surface of a succeeding metal plate is abutted against the trailing end surface of a preceding metal plate, and the butted portion is welded. ing. As one of the butt welding methods, there is a butt laser welding method of welding a butt portion with a laser beam. According to this method, the weld bead width is narrow and a deep penetration is obtained, so that the weldability is excellent. Further, since the heat-affected zone is narrow, distortion is small, and coarsening of crystal grains is suppressed, there is an advantage that the quality of the welded portion is excellent.

[0003] On the other hand, when performing laser welding, it is necessary to perform the butting of the metal plates with high precision. Further, in order to avoid using a filler metal for replenishing the molten metal to the welded portion, the welding must be performed. It is necessary to make the gap as small as possible. In order to achieve such matching accuracy,
Conventionally, a high-rigidity and large shear has been attached to a laser welding apparatus in order to increase cutting accuracy. However, the cut surface by the shear becomes a form having a cut surface and a fractured surface, and it is difficult to obtain uniformity in the thickness direction. For this reason, in order to obtain optimum cutting conditions, a mechanism for adjusting the clearance of the blade in accordance with the thickness and the material of the blade is required, and the rigidity and size of the shear itself are increased, resulting in high equipment costs.

For this reason, in recent years, as disclosed in Japanese Patent No. 2564042, there has been proposed a laser cutting welding method and apparatus in which a laser beam for welding is also used for cutting an end face of a metal plate.

[0005]

The types of beams (mode, frequency, and output indicating the form of energy density distribution in a beam cross section) differ between laser cutting and laser welding. In other words, the type of laser beam is generally a single mode in which the output is low but the light condensing property is excellent (the energy density has a peak at the center of the beam cross section, and the energy density decreases toward the periphery). Density mode) and a ring mode (having an energy density distribution with a peak of energy density at a position separated from the center of the beam cross section by a certain radius) or a ring mode that provides high output but is inferior in light focusing. There is a multi-mode beam (having an energy density distribution having a trapezoidal high energy density region at the center of the beam cross section). In laser cutting, in order to perform cutting with high accuracy and at high speed, a beam having a high peak output due to pulse oscillation in a single mode excellent in light collecting property is suitable. On the other hand, in order to realize high-speed laser welding, those capable of continuously oscillating a high-power beam are suitable. In this case,
A ring-mode or multi-mode beam in a high power region where an optical lens cannot be used in transmitting a beam from an oscillator is suitable.

Therefore, as described in the above publication, when cutting and welding are performed using a kind of laser beam, either cutting or welding performance is sacrificed due to the characteristics of the laser beam. That is, if the emphasis is placed on weldability, the uniformity of the cut surface becomes insufficient. On the other hand, if the emphasis is placed on cutability, the welding speed during welding decreases. For this reason, a decrease in productivity due to a decrease in welding speed or a decrease in welding quality due to a decrease in cut surface accuracy is caused.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a laser cutting welding method and an apparatus therefor capable of obtaining excellent welding quality without reducing the welding speed.

[0008]

According to a first aspect of the present invention, there is provided a laser cutting welding method, wherein a cutting laser beam output from a cutting laser oscillator is focused on one of a metal plate and the other metal plate. A cutting beam is irradiated and cut to make a cut. The end faces of the cut metal plate are abutted with each other, and the welding portion is irradiated with a welding condensed beam obtained by condensing a welding laser beam output from a welding laser oscillator. It is to be welded.

According to the present invention, the cutting laser beam and the welding laser beam are controlled by the cutting laser oscillator and the welding laser oscillator, respectively, in a mode optimal for cutting or welding, ie, a single mode laser beam for cutting. Since a ring mode or multi-mode laser beam can be used for welding,
In laser welding, the welding speed does not decrease, and in laser cutting, a cut surface with excellent flushness can be obtained, which in turn improves the matching of the mating surfaces at the butted part, improving the welding quality. Can be planned.

Further, in the laser cutting welding method according to claim 2, in the invention described in claim 1, the butt portion is irradiated with a condensed beam obtained by condensing the cutting laser beam, and is preheated. The welding is performed by irradiating the welding focused beam.

According to the present invention, when the butted portion is irradiated with the welding condensed beam and the irradiated portion is welded,
Since the irradiating section is preheated in advance by irradiation of the converging beam, the energy absorption rate of the converging beam for welding is improved, good penetration is obtained, and the welding speed and welding quality are further improved. I can do it. Note that the cutting laser beam is not used only for cutting a metal plate, but is used as an output of a cutting laser oscillator as in the invention of the present invention (the same in the inventions according to the following claims). Is appropriately adjusted and used for preheating. In the present invention, the focused beam used for preheating includes:
Not only the cutting condensing beam obtained by condensing the cutting laser beam by the cutting condensing member but also the preheating condensing beam condensed by a preheating condensing member different from the cutting condensing member is included. It is a thing.

In a third aspect of the present invention, in the laser cutting welding method according to the second aspect, the butt portion is irradiated with the condensed beam to preheat the butt portion to a glowing state.

According to the present invention, when the butt portion is irradiated with the welding condensed beam and the irradiated portion is welded, the irradiated portion to be laser-welded is preheated to a red-hot state. The energy absorption of the focused beam for welding is extremely high, very good penetration is obtained, and excellent welding speed and welding quality can be obtained.

According to a fourth aspect of the present invention, there is provided a laser cutting welding apparatus comprising: a first clamp portion for holding one metal plate so as to be able to be opened and held; and a metal plate for holding the other metal plate so as to be able to be opened and held. A second clamp portion capable of moving relative to an end surface of one of the metal plates sandwiched by the first clamp portion so that the end surface of the plate can approach and separate from the end surface of the one metal plate; a laser oscillator for cutting; a laser oscillator for welding; A laser beam for cutting, which is output by a laser oscillator for laser beam, and a laser beam for cutting, the laser beam for laser beam being condensed so as to cut the metal plate sandwiched between the first clamp portion and the second clamp portion. A cutting welding torch comprising a welding laser beam output by an oscillator and a welding condensing portion for converging so as to weld the butted portions of the end faces of the one and the other metal plates, and The cross-sectional welding torch is one having a torch moving unit that moves in the width direction and length direction of the metal plate.

According to this invention, the cutting laser beam is condensed by the cutting condensing section, and the cutting condensing beam is moved in the width direction of the metal plate sandwiched by the first and second clamp sections. By irradiating while irradiating, the metal plate is cut in the width direction. Thereafter, by moving the second clamp portion relatively to the first clamp portion side, the end surfaces of the cut metal plates are butted against each other. Then, the butt portion is welded by irradiating the welding laser beam while being moved along the butt portion of the metal plate while the welding laser beam is focused by the welding condensing portion. At this time, the laser beam for cutting and the laser beam for welding can use the laser beam in the mode most suitable for cutting or welding by the laser oscillator for cutting and the laser oscillator for welding, respectively. In addition, it is possible to obtain a cut surface which is excellent in flushness in laser cutting, thereby improving the matching of the mating surfaces at the butted portions and improving the welding quality.

According to a fifth aspect of the present invention, in the laser cutting welding apparatus according to the fourth aspect, the welding laser beam is focused by the welding focusing section. The welding condensate beam is preliminarily irradiated on the irradiating section by pre-irradiating the irradiating section with the cutting laser beam condensed by the cutting condensing section so as to preheat the irradiating section of the abutting section. The light part and the cutting light condensing part are arranged close to each other.

According to the present invention, the butt portion is irradiated with the welding condensed beam, and when the irradiated portion is welded,
Since the irradiation unit is preheated in advance by the irradiation of the cutting condensing beam, the energy absorption rate of the welding condensing beam is improved, good penetration is obtained, and the welding speed and welding quality are further improved. Can be achieved.

According to a sixth aspect of the present invention, in the laser cutting welding apparatus according to the fourth aspect, the welding laser beam is focused on the cutting welding torch by the welding focusing section. The cutting laser beam is condensed so as to pre-heat the irradiating portion of the butt portion to which the welding condensing beam is irradiated. A preheating condensing section for condensing the laser beam; and an optical path switching means for switching an optical path of the cutting laser beam output from the cutting laser oscillator from the cutting condensing section side to the preheating condensing section side. It was done.

According to this invention, the butt portion of the metal plate is irradiated with the converging beam for welding, and when welding the irradiating portion, the cutting laser beam output from the laser oscillator for cutting is used to switch the optical path. Transmitted to the preheating condensing section via, the preheating condensed beam condensed by this preheating condensing section is irradiated beforehand on the irradiation section, and the irradiation section to be laser welded is preheated, The energy absorption rate of the focused beam for welding is improved, good penetration is obtained, and the welding speed and welding quality can be further improved. As described in claim 5, when the irradiation part of the welding condensed beam is preheated by the condensing beam for cutting, it is necessary to arrange the condensing part for cutting close to the condensing part for welding. According to the present invention, the degree of freedom of the arrangement of the light-collecting portion for cutting and the light-collecting portion for welding is increased, and the design and manufacture are easy.

According to a seventh aspect of the present invention, in the laser cutting welding apparatus according to the fourth aspect, the welding laser beam is focused on the cutting welding torch by the welding focusing section. The cutting laser so that the preheating condensed beam in which the cutting laser beam is condensed so as to preheat the irradiation portion of the butting portion to which the welding condensing beam is irradiated is irradiated on the irradiation portion in advance. A preheating condensing section for condensing the beam is provided, and the cutting condensing section and the preheating condensing section are connected to the cutting laser oscillator via optical fibers, respectively. An optical path switching means for transmitting the output cutting laser beam to one of the optical fibers is provided.

According to the present invention, the cutting laser beam output from the cutting laser oscillator is transmitted to the cutting light collecting section or the preheating light collecting section via one of the optical fibers by the optical path switching means. Since the transmission path of the laser beam for cutting and the torch for cutting welding can be easily and easily configured, the degree of freedom in the arrangement of the focusing part for cutting and the focusing part for welding is increased, and Is easy. Also, when the butt portion is irradiated with the welding condensed beam and the irradiated portion is welded, the cutting laser beam output from the cutting laser oscillator is applied to the preheating condensing portion via the optical path switching means. Transmitted, the preheating condensed beam condensed by the preheating condensing part is previously irradiated on the irradiation part, and the irradiation part to be laser-welded is preheated. And good penetration can be obtained, and the welding speed and welding quality can be further improved.

[0022]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS First, a laser cutting welding apparatus according to an embodiment will be described with reference to the drawings. In FIG. 1, for convenience of description, the length direction of the metal plate is indicated by the X axis,
The orthogonal coordinate system in which the width direction of the metal plate is the Y axis (the direction of the arrow is positive) is shown.

As shown in FIG. 1, the laser cutting and welding apparatus comprises a first clamp portion 1 for holding a metal plate such as a steel plate conveyed horizontally in the X-axis direction so as to be openably slidable, and the first clamp portion. A second clamp portion 2 is disposed on the base 3 so as to be opposed to the first clamp member 1 and to be movable toward the X-axis so as to be movable toward and away from the first clamp member 2. The first clamp portion 1 and the second clamp portion 2 move upward and downward with respect to the upper plate 5 serving as a reference for positioning the metal plate in the vertical direction, and move the metal plate between the upper plate 5 and the upper plate 5. Lower plate 6 to hold and open
And a lifting means 7 such as a hydraulic cylinder for raising and lowering the lower plate 6 with respect to the upper plate 5.

A pair of carriers 9, 9 are provided on both sides of the base 3 so as to be able to stop moving in the X-axis direction. A torch for cutting and welding is provided on the upper portions of the carriers 9, 9 along the Y-axis direction. A movable frame 10 for moving the movable member 20 along the Y-axis direction so as to be able to stop moving is provided. The carriers 9, 9 and the moving frame 10 constitute a torch moving section of the present invention.

Further, in a region near the base 3 which does not interfere with the carriers 9, 9, a cutting laser oscillator 13 is provided.
And a welding laser oscillator 14. The cutting laser oscillator 13 is capable of performing pulse oscillation and continuous oscillation and oscillating a single-mode laser beam having excellent light condensing properties. Specifically, a solid-state laser such as a YAG laser or a CO ₂ gas laser Gas lasers such as are preferred.
On the other hand, the welding laser oscillator 14 oscillates a ring-mode or multi-mode laser beam capable of continuous high-power oscillation. Specifically, a gas laser such as C
O ₂ gas lasers are preferred. The cutting laser beam and the welding laser beam output from the cutting laser oscillator 13 and the welding laser oscillator 14 are used for a relay box 17 having telescopic beam transmitting members 16A and 16B such as bellows and a reflecting mirror. Is transmitted to the cutting and welding torch 20 attached to the moving frame 10 via the.

As shown in FIG. 2, the cutting and welding torch 20 has a welding laser oscillator 14 inside a torch body 21.
A welding condensing mirror 24 is provided for condensing the welding laser beam W1 transmitted through the beam transmitting member 16B through the reflecting mirrors 22 and 23, and is condensed by the welding condensing mirror 24. Focused welding beam W
2 is irradiated vertically toward the metal plate located below. The torch main body 21 has the welding condensing beam W
A welding gas nozzle 26 for injecting a shielding gas is provided so as to cover the irradiation part (welding part) 2. The shield gas is used to prevent oxidation of the welded portion and to prevent evaporation of the metal. For example, an inert gas such as nitrogen gas or argon gas is used.

A torch main body 21 is provided with a preheating condenser lens 28 for condensing the cutting laser beam C1 used for preheating. This preheating condenser lens 28
The irradiation part of the condensing beam H for preheating condensed by this is located near the front of the irradiation part of the condensing beam W2 for welding in the positive Y-axis direction (the traveling direction of the cutting torch 20 during welding). It is arranged to be located.

At the lower part of the torch body 21, a cutting gas nozzle 31 having a cutting condenser lens 30 for condensing the cutting laser beam C1 used for cutting is attached. As the cutting condenser lens 30, a lens having a short focal length and excellent condensing properties is used, and the condensed condensing beam C <b> 2 which is condensed is vertically irradiated toward a metal plate located below. You. The cutting gas nozzle 3
1, a gas supply port 32 is provided below the cutting condenser lens 30. The assist gas supplied from the gas supply port 32 is supplied to the metal plate from the nozzle tip port together with the cutting condenser beam C2. It is sprayed toward the surface of. When the metal plate is laser-cut, the assist gas causes an oxidation reaction with the metal to accelerate the dissolution and evaporation of the metal. For example, oxygen gas is used for laser cutting of a steel plate.

In the torch main body 21, the optical path of the cutting laser beam C1 transmitted from the cutting laser oscillator 13 through the beam transmitting member 16A is set to the cutting condensing lens 30 side or the preheating. An optical path switching reflecting mirror 34 for switching to the side of the condensing lens 28 is provided, and the optical path switching reflecting mirror 34 is configured to be able to stop rotating around a pivot shaft 35.

The condensing beam W2 for welding, the condensing beam H for preheating and the condensing beam C2 for cutting are reflected by a reflecting mirror so that the center line of each beam passes through a plane set up perpendicular to the metal plate. An optical system member such as a mirror is disposed. The welding condensing mirror 24, the preheating condensing lens 28, the cutting condensing lens 30, and the optical path switching reflection mirror 34 are each a welding condensing part of the present invention. , A preheating condensing unit, a cutting condensing unit, and an optical path switching unit.

Next, the laser cutting welding method of the present invention will be described through the operation of the laser cutting welding apparatus. First, as shown in FIG.
At a position separated from the clamp unit 2, the end of one metal plate S <b> 1 is clamped by the first clamp unit 1, and the end of the other metal plate S <b> 2 is clamped by the second clamp unit 2. Then, the end of the metal plate S1 held by the first clamp unit 1 is laser-cut. That is, while moving the welding torch 20 in the positive direction of the Y-axis from the outside in the width direction of the metal plate S1, the cutting laser beam C1
The light is transmitted to the cutting condensing lens 30 through 4, and the cutting condensing beam C2 is irradiated on the metal plate S1 to cut the end of the metal plate S1 in the width direction. At this time, a high-pressure assist gas is supplied from the gas supply port 32, and laser cutting is promoted by oxidizing heat generated in the cutting section.

After cutting the metal plate S1, as shown in FIG.
The carrier 9, 9 is moved to the second clamp portion 2 side, and the cutting and welding torch 20 is moved in the negative direction of the Y-axis.
The end of the metal plate S2 sandwiched by the laser cutting is performed.

After laser cutting the end of the metal plate S2, as shown in FIG. 5, the second clamp 2 is connected to the first clamp 1
Then, the end cut surface of the metal plate S1 held by the first clamp portion 1 and the end cut surface of the metal plate S2 held by the second clamp portion 2 are abutted. During this time, the carriers 9, 9 are also moved to the first clamp portion 1 side, and the irradiating portions of the welding condensing beam W2 and the preheating condensing beam H emitted from the cutting and welding torch 20 are made of the metal plate S1 and the metal plate S2. Are positioned so as to be located on a straight line passing through the abutting portion of.

Next, a welding laser beam W1 is output from the welding laser oscillator 14, and this is reflected by the reflection mirrors 22,2.
3, the laser beam is transmitted to the welding condensing mirror 24 to form a condensing welding beam W2, and the output of the cutting laser oscillator 13 is adjusted to produce a cutting laser beam C1 for preheating. And the optical path switching reflection mirror 34 is rotated,
The optical path is cut from the condenser lens 30 for cutting to the condenser lens 2 for preheating.
Then, the laser beam for cutting C1 is condensed by the condensing lens for preheating 28 to form a condensing beam H for preheating. Then, when the cutting welding torch 20 is moved in the positive direction of the Y-axis, the preheating condensing beam H is irradiated immediately before the irradiation of the welding condensing beam W2, and the butting portion of the metal plate S1 and the metal plate S2 is joined. An irradiation part which glows red by irradiation of the condensing beam H for preheating is formed, and then the condensing beam W2 for welding is irradiated to the irradiation part in the red heat state. At this time, since the irradiation part of the welding condensing beam W2 is already in a red-hot state, the energy absorption rate of the welding condensing beam W2 can be greatly increased, and only the welding condensing beam W2 is simply irradiated. As compared with the case of welding by welding, deep penetration can be obtained, and high-speed welding of high quality can be realized. The preheating state is preferably a glowing state (including a dark glowing state) when irradiating the welding condensing beam W2, but even if the preheating state does not reach the glowing state,
Compared to the case where welding is performed by simply irradiating only the welding condensing beam W2, the energy absorption rate of the welding condensing beam W2 is improved, so that weldability and welding speed can be improved.

In the above embodiment, the cutting laser oscillator 1
The laser oscillator 3 and the welding laser oscillator 14 are arranged on both sides of the base 3, but both oscillators may be provided on one of the sides as shown by a two-dot chain line in FIG. FIG. 6 shows a structural example of the cutting welding torch 20A in this case.
In FIG. 6, members having the same functions as those in FIG. 2 are indicated by the same reference numerals.

In this cutting welding torch 20A, the cutting gas nozzle 31 provided with the cutting condenser lens 30 is provided on the laser beam incident side of the torch main body 21A via the cylindrical body 40. The cutting laser beam C1 output from the cutting laser oscillator 13 is provided in the torch main body 21A.
An optical path switching reflection mirror 34A is provided which can stop moving between a cutting position where the light is reflected toward the cutting condenser lens 30 and a preheating position where the light is passed in the transmission direction, and the optical path switching reflection mirror 34A is moved to the preheating position. A preheating condensing mirror (corresponding to a preheating condensing part) 43 for condensing the cutting laser beam C1 that has passed at a certain time via the reflection mirrors 41 and 42 is provided. The preheating condensing beam H condensed by the preheating condensing mirror 43 is applied to the irradiation part of the welding condensing beam W2 near the front in the traveling direction of the cutting welding torch 20A, and the irradiation part is irradiated. Preheat in advance. The arrow in the figure indicates the traveling direction of the cutting welding torch 20A during welding.

In the above embodiment, the transmission of the cutting laser beam C1 to the preheating condenser lens 28 and the cutting condenser lens 30 is performed by the reflection mirror.
Since the laser oscillator 13 may have a smaller output than the laser oscillator 14 for welding, for example, a yag laser oscillator is used as the laser oscillator 13 for cutting, and the laser beam for cutting is condensed by an optical fiber into a condensing section for cutting and a condensing section for preheating. It may be transmitted to a unit. FIG. 7 shows a structural example of the cutting torch 20B in this case. In FIG. 7, members having the same functions as those in FIG. 2 are indicated by the same reference numerals.

In the cutting and welding torch 20B, the reflection mirrors 22 and 23 and the welding light focusing mirror 24 for forming the welding focused beam W2 are provided inside the torch main body 21B.
Is merely provided. On the other hand, the torch body 21B
At the front end of the cutting torch part (corresponding to a cutting condensing part) 51 pointing vertically downward, and near the front of the cutting and welding torch 20B in the traveling direction with respect to the irradiation part of the welding condensing beam W2. A preheating condensing torch portion (corresponding to a preheating condensing portion) 52 is provided via a mounting member 60, and these condensing torch portions 51 and 52 are provided with a cutting laser oscillator and optical fibers 54 and 55. Are linked by A cutting gas nozzle 58 and a preheating gas nozzle 59 having gas supply ports 56 and 57, respectively, are attached to the distal ends of the cutting light collecting torch 51 and the preheating light collecting torch 52, respectively. An assist gas is supplied to a gas supply port 56 of the cutting gas nozzle 58, and a shielding gas is supplied to a gas supply port 57 of the preheating gas nozzle 59. These gases are supplied from a gas injection port formed at the tip of the nozzle. It is sprayed so as to cover the converging beam C2 for cutting and the converging beam H for preheating. The arrow in the figure indicates the cutting welding torch 20 during welding.
The direction of travel of B is shown.

In this embodiment, the cutting torch 20
B only needs to transmit the welding laser beam W1 and therefore has a simple structure. Further, since the transmission of the cutting laser beam C1 used for cutting or preheating is performed by the optical fibers 54 and 55, the transmission path is also required. It can be easily configured. The cutting laser oscillator is provided with an optical path switching means so that the cutting laser beam output from the cutting laser oscillator can be preheated to the optical fiber 54 on the cutting condensing torch 51 side. The light is transmitted to any one of the optical fibers 55 on the side of the light collecting torch 52.

In the above embodiment, the preheating condenser lens, the preheating condenser mirror, and the preheating condenser torch are provided.
Thus, the irradiation part of the welding condensing beam W2 is preheated in advance. However, these preheating condensing parts are not necessarily required, and the irradiation part of the welding condensing beam W2 is cut near the front in the welding direction. An optical system may be provided so that the irradiation part of the condensing beam C2 comes, and the output of the condensing beam C2 for cutting may be adjusted to be used as a condensing beam for preheating.

[0041]

According to the present invention, a laser oscillator for cutting and a laser oscillator for welding are separately provided, so that a laser beam in a mode optimal for cutting or welding can be used. The welding quality can be improved without lowering the speed. Further, by preheating the irradiation part of the welding condensing beam in advance, the energy absorption rate of the welding condensing beam can be improved, and the welding speed and welding quality can be further improved. .

[Brief description of the drawings]

FIG. 1 is an overall perspective view of a laser cutting welding apparatus according to an embodiment.

FIG. 2 is an explanatory sectional view of the cutting torch according to the embodiment;

FIG. 3 is a cross-sectional side view of a main part showing a state where an end of one metal plate is laser-cut.

FIG. 4 is a cross-sectional side view of a main part showing a state where an end of the other metal plate is laser-cut.

FIG. 5 is a cross-sectional side view of a main part showing a state where a butted portion where the end faces of one metal plate and the other metal plate are butted is laser-welded.

FIG. 6 is an explanatory sectional view of a cutting torch according to another embodiment.

FIG. 7 is an explanatory cross-sectional view of a cutting welding torch when a cutting laser beam is transmitted by an optical fiber.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 1st clamp part 2 2nd clamp part 9 Carrier 10 Moving frame 13 Laser oscillator for cutting 14 Laser oscillator for welding 20, 20A, 20B Torch for cutting and welding 24 Condensing mirror for welding 28 Condensing lens for preheating 30 Cutting Condensing lens 34, 34A Optical path switching reflecting mirror 43 Preheating condensing mirror 51 Cutting condensing torch 52 Preheating condensing torch 54, 55 Optical fiber

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) // B21B 1/26 B21B 1/26 C 15/00 15/00 A

Claims (7)

[Claims] 1. A metal plate after cutting by irradiating each of the one metal plate and the other metal plate with a cutting condensing beam obtained by condensing a cutting laser beam outputted from a cutting laser oscillator. A laser cutting welding method in which end faces of the laser beam are butted, and the butted portion is welded by irradiating a welding condensed beam obtained by condensing a welding laser beam output from a welding laser oscillator. 2. The laser cutting welding according to claim 1, wherein the welding is performed by irradiating the converging beam with the condensing beam for welding while irradiating the butted portion with a condensed beam obtained by condensing the laser beam for cutting and preheating. Method. 3. The laser cutting welding method according to claim 2, wherein the butt portion is irradiated with the condensed beam to preheat to a red hot state. 4. A first clamp portion for holding one of the metal plates so as to be able to be opened and held, and an end surface of the other metal plate for holding and holding the other metal plate so as to be able to be opened and held by the first clamp portion. A second clamp portion movable relatively close to and away from the end surface of the one of the metal plates, a cutting laser oscillator, a welding laser oscillator, and a cutting laser beam output by the cutting laser oscillator. A laser beam for welding output from the laser oscillator for welding, and a laser beam for welding output from the laser oscillator for welding. A cutting and welding torch provided with a welding condensing portion for condensing so that the butted portions of the end surfaces of the other metal plates are welded; and Laser cutting welding device having a torch moving unit that moves in the direction. 5. The cutting light condensing portion for preheating an irradiation portion of the butting portion to which a welding condensing beam in which the welding laser beam is condensed by the welding light condensing portion is irradiated. 5. The welding condensing unit and the cutting condensing unit are arranged close to each other so that the cutting condensed beam in which the laser beam is condensed is irradiated on the irradiation unit in advance. Laser cutting welding equipment. 6. The cutting torch for preheating an irradiating section of the butt section to which a welding condensed beam in which the welding laser beam is condensed by the welding condensing section is irradiated. A preheating condensing section for condensing the cutting laser beam so that the preheating condensed beam in which the cutting laser beam is condensed is irradiated on the irradiation section in advance, and the laser beam for cutting is output by the cutting laser oscillator. 5. The laser cutting welding apparatus according to claim 4, further comprising: an optical path switching means for switching an optical path of the cutting laser beam from the cutting light collecting section to the preheating light collecting section. 7. The cutting and welding torch is irradiated with a welding condensed beam in which the welding laser beam is condensed by the welding condensing portion, and the cutting is performed to preheat an irradiating portion of the butting portion. A preheating condensing unit that condenses the cutting laser beam so that the preheating condensed beam in which the laser beam is condensed is irradiated on the irradiation unit in advance; and the cutting condensing unit and Each of the preheating condensing portions is connected to the cutting laser oscillator via an optical fiber, and an optical path switching means for transmitting the cutting laser beam output by the cutting laser oscillator to the one of the optical fibers is provided. The laser cutting welding device according to claim 4, wherein the laser cutting welding device is provided.