JPH06574U - Welding torch - Google Patents

Abstract

(57) [Summary] [Purpose] To prevent a shield failure even when the tip of the torch nozzle extends above the upper surface of the narrow groove. [Structure] The width W of the torch nozzle 1 is reduced for a narrow groove. A pair of left and right nozzle movable parts 2 is provided at the tip of the torch nozzle 1.
The a and 2b are joined so as to be openable and closable. When performing welding at a deep place in the narrow groove 13, the left and right nozzle movable parts 2a and 2b are closed to reduce the width W. When the nozzle movable portions 2a, 2b on the left and right of the narrow groove 13 are projected upward, the screwed shaft 5 constituting the opening / closing device 11 is lowered to lower the lever 8.
The nozzle moving parts 2a and 2b are opened to the left and right via a and 8b. As a result, the nozzle opening is enlarged left and right, and the shield condition is improved.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention mainly relates to a welding torch used when performing narrow groove welding.

[0002]

[Prior art]

 For example, when butt-welding thick-walled members, particularly when performing narrow groove welding, the welding torch cannot be inserted into the narrow groove unless the torch nozzle is made thin.

Therefore, conventionally, as shown in FIG. 4, a welding torch having a thin width by reducing the width W of the torch nozzle d so that it can be inserted into the joint narrow groove c of the thick members a and b to be welded. I am trying to use. e is an electrode wire.

[0004]

[Problems to be solved by the device]

 However, when welding is performed in the narrow groove c using the conventional welding torch in which the width W of the torch nozzle d is reduced, the work can be performed in the groove c as shown in FIG. 3, but as shown in FIG. When the tip of the torch nozzle d goes out from inside the groove c and comes off above the upper surface of the groove c, the width W of the torch nozzle is small and the shield range is small. There is a problem in that a shielding gas in the groove is caused by the shielding gas ejected from between the wires e and a defect (a blow hole) occurs. Therefore, it is necessary to replace the welding torch with a wide torch nozzle width, and unmanned operation cannot be achieved.

Therefore, according to the present invention, it is possible to perform welding work in a narrow groove, and even if the torch nozzle tip part deviates from the upper surface of the groove, the shielding gas can cover the inside of the groove and enhance the shielding effect. It is intended to provide a welding torch.

[0006]

[Means for Solving the Problems]

 In order to solve the above problems, the present invention attaches a pair of left and right movable parts of the nozzle to the tip of the torch nozzle so as to be opened and closed in the left and right directions so that the nozzle openings can be adjusted wide and narrow, and the left and right movable parts of the nozzle can It shall be configured with a device for opening and closing.

[0007]

[Action]

 When performing welding in a narrow groove, welding is performed with the torch nozzle width reduced, and when the tip of the torch nozzle reaches a position that is off the upper surface of the groove, the nozzle movable part at the tip of the torch nozzle is opened to widen the nozzle width. To do. As a result, the shield condition is improved and the shield performance inside the groove can be secured even if the tip of the torch nozzle goes out of the groove.

[0008]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings.

FIGS. 1 and 2 show an embodiment of the present invention. In order to make a welding torch for a narrow groove, in the configuration in which the nozzle width W of the torch nozzle 1 is small, the tip of the torch nozzle 1 is shown. In addition, a pair of left and right movable nozzle parts 2a and 2b, which are divided in the left-right direction (direction orthogonal to the welding line), are connected by a joint part 3 made of a soft material so as to be freely rotatable in the left-right direction. Moreover, even if the above-mentioned nozzle movable parts 2a and 2b are opened to the maximum in the left-right direction, one nozzle opening is formed, for example, as shown in FIG. 1C, the left and right nozzle movable parts 2a, 2b are formed. The bellows 4 are connected to each other.

Further, on the front and rear side surfaces of the torch nozzle 1, as opening / closing devices 11, shaft supporting metal members 6 for guiding at least the threaded shaft 5 and a nut member 7 screwed with the threaded shaft 5 are provided. Also, the lower end of the screwed shaft 5 screwed in the nut member 7 and arranged in the vertical direction is guided by the shaft support metal 6, and the lower ends thereof are respectively connected to the left and right nozzle movable parts 2a and 2b. Each of the levers 8a and 8b pivotally attached by means of a pin 9 is rotatably pivoted at its other end by a pin 9, and a knob 10 attached to the upper end of the screwed shaft 5 is turned to be screwed. By moving the shaft 5 up and down, the left and right nozzle movable parts 2a and 2b are opened and closed via the levers 8a and 8b.

Reference numeral 1a is an electrode wire.

In the butt welding of the members 12 a and 12 b to be welded, when welding the deep rollers in the narrow groove 13, the torch nozzle 1 is placed in the narrow groove 13 as in the conventional case shown in FIG. The nozzle movable parts 2a and 2b at the tip of the torch nozzle are closed so that the torch nozzle is inserted into the nozzle.

When the welding in the narrow groove 13 progresses and the tip portion of the torch nozzle comes out above the upper surface of the groove 13 as shown in FIG. 2, the screwed shaft 5 is rotated and lowered. The levers 8a and 8b are rotated to push the nozzle movable portions 2a and 2b outward with the joint portion 3 as the center, and open in the left and right directions. As a result, the nozzle opening is enlarged so as to be wide in the left-right direction, the ejection angle of the shield gas is widened, and the groove 13 can be covered with the shield gas.

FIG. 3 shows another embodiment of the present invention. Instead of connecting the left and right nozzle movable parts 2a and 2b with the bellows 4, it is a superposed type and the left and right nozzle movable parts 2a and 2b are connected. By opening and closing 2b, one nozzle port is expanded and contracted in the left-right direction.

Also in this embodiment, the nozzle movable parts 2a and 2b can be opened and closed to the left and right to change the jetting angle of the shield, and the nozzle movable parts 2a and 2b are moved above the groove 13 as in the above-described embodiment. The situation of the shield can be improved even if it comes out.

It should be noted that the present invention is not limited to the above-described embodiment, and, for example, in the above-described embodiment, the case where the nozzle movable parts 2a and 2b are opened and closed by manually operating the screw shaft 5 has been shown. However, for example, it may be programmed in advance according to the finish height of each pass in narrow groove welding, and the openings of the nozzle movable parts 2a and 2b may be automatically adjusted according to this program. Of course, various changes can be made without departing from the spirit of the invention.

[0017]

[Effect of device]

 As described above, according to the welding torch of the present invention, since the nozzle movable portion that can be opened and closed in the left and right directions is attached to the tip of the torch nozzle so as to be openable and closable, welding in a narrow groove can be performed especially. When the tip end of the torch nozzle moves above the upper surface of the groove as it advances, the nozzle width can be easily changed from a small nozzle width to a large nozzle width, and the occurrence of shield failure can be prevented. It is possible to prevent the occurrence of defects (blowholes) due to defective shields, and it is possible to achieve unattended operation without the need to replace the welding torch.

[Brief description of drawings]

1 shows an embodiment of the welding torch of the present invention,
(A) is a front view, (B) is a side view of (A), and (C) is an AA arrow view of (A).

FIG. 2 is a front view showing a state in which a nozzle movable portion is opened.

FIG. 3 shows another embodiment of the present invention and is a sectional view corresponding to FIG.

FIG. 4 is a schematic front view showing a state in which narrow groove welding is performed by a conventional welding torch.

5 is a schematic front view showing a state in which the torch nozzle tip portion is disengaged upward from the groove upper surface from the situation of FIG. 4. FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Torch nozzle 2a, 2b Nozzle movable part 3 Joint part 4 Bellows 5 Screw shaft 7 Nut member 8a, 8b Lever 11 Opening device 13 Narrow groove

Claims (1)

[Scope of utility model registration request] 1. A device for opening and closing a pair of left and right movable parts of a nozzle, which can be opened and closed in the left-right direction to adjust the width of the nozzle opening, is provided at the tip of the torch nozzle body, and the device for opening and closing the movable part of the nozzle. Welding torch characterized by becoming.