JP2918756B2 - Vertical electrogas welding torch - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a welding torch for electro-gas welding a vertical butt portion of a steel structure or a ship building long material.

[0002]

2. Description of the Related Art As a welding device for a vertical butt joint having a narrow groove, a welding torch is sandwiched by a roller mechanism so that the welding torch can be moved up and down. With a consumable gas nozzle,
A vertical electrogas welding device for performing welding has been developed (see Japanese Patent Publication No. 59-22625), and a welding torch used for the vertical electrogas welding device has been developed (see Japanese Patent Publication No. 60-20116). ).

An outline of the apparatus described in Japanese Patent Publication No. 59-22625 will be described with reference to FIGS. That is, the materials 1a and 2
a welding torch 21 is inserted into a groove formed by enclosing a backing metal 3a and a front metal 4a made of a copper plate to perform vertical electrogas welding, and the welding torch 21 is electrically conductive. A non-consumable one made of good copper or copper alloy and formed in a tubular shape.
, And a pressure roller 9a pressed by a pressure screw 8a. The roller 7a penetrates the gas junction box 17, and is provided with a glass fiber or the like provided at a lower portion of the junction box 17. A concentric gas nozzle 18 surrounds and is inserted into a groove. A base 12a for holding these members is driven by a motor 13a via a slider mechanism with a sliding shaft 20a as a guide, as indicated by arrows 14a.
, And the wire 25a supplied to the welding portion through the welding torch 21 is also oscillated in the direction of the arrow 14a. Further, the welding device is clamped to the material 2a to be welded by screws 15a, and a gas junction box 17 is provided with a mouthpiece 16 for taking in shielding gas. The knob 24a provided on the vibrating part is connected to the base 12
A push screw 23a for stopping the vibration of a at one end is turned.

The operation of the above welding apparatus will be described. As the wire 25a is fed through the welding torch 21 and melts, the gas nozzle 18 gradually wears out and the welding torch 2
1 is driven by the roller 7a and rises, and the welding proceeds. The shielding gas taken into the gas junction box 17 is
The welding portion is shielded through the gap between the gas nozzle 18 and the welding torch 21. On the other hand, the base 12a attached to the sliding block 19a is vibrated in the direction of the arrow 14a, and the welding torch 21 and the gas nozzle 18 vibrate similarly in the groove, so that the heat input is evenly distributed from the front to the back of the groove. Let V
In the groove of the mold, if necessary, the screw 23a is fed to temporarily stop the vibration at the groove surface to distribute the heat input corresponding to the cross-sectional area of the groove. , And sound welding without defects such as insufficient penetration is performed.

However, in the vertical electrogas welding apparatus described above, the gas nozzle 18 is consumed as welding progresses, and the components of the gas nozzle melt into the molten metal and intervene in the molten metal. After the welding is completed, all the gas nozzles do not wear out and the vicinity of the mounting portion remains about 60 mm. Therefore, it is necessary to remove the residual material and replace with a new nozzle. In addition, it is necessary to determine the length of the consumable gas nozzle according to the welding length, prepare a gas nozzle according to the welding length, and, after setting the gas nozzle, set the welding torch. It becomes extremely complicated. Also, since the welding torch is raised or installed in a state penetrating the gas junction box, the welding torch may be damaged or friction, which may hinder the lifting operation.

[0006]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems of the conventional apparatus. The welding torch and the gas nozzle are separated from each other, and the gas nozzle body is consumed. Vertical electrogas welding, which reduces the complexity of preparing gas nozzles and replacing gas nozzles each time welding is completed, prevents damage to the welding torch, and allows the welding torch to be smoothly raised by the clamping rollers. It is intended to provide a torch for use.

[0007]

In order to achieve the above object, the present invention provides a welding torch which is inserted into a groove of a welding base material and which can be pulled up in synchronization with a welding speed. A gas nozzle 32, an outer cylinder 34 supported in the gas nozzle 32 via a gas nozzle guide 33, and a nozzle body 36 inserted and fixed to the outer cylinder 34 and having a wire insertion hole at the center. Cylinder 3
The inside of 4 is formed with chambers 42 and 43 serving as cooling water supply / drain passages separated in the axial direction by a nozzle body 36. The chambers are connected at the front of the nozzle body, and the rear of the outer cylinder 34 is relayed by water. This is a vertical electrogas welding torch characterized by being connected and fixed to a metal fitting 37, and further connecting and integrating the water relay metal fitting 37 and the gas relay metal fitting 36.

[0008]

The present invention will be described below in detail. The vertical electrogas welding torch according to the present invention can be as long as 500 mm or more in length and in some cases close to 1000 mm, and its diameter is about 12 mm. The basic cross-sectional structure of the vertical electrogas welding torch includes a gas nozzle connected to a gas relay fitting, an outer cylinder inserted into the gas nozzle, and a nozzle body inserted into the outer cylinder. A wire insertion hole is formed at the center of the nozzle body, and a cooling water supply / drain passage extending in the axial direction is formed between the outer cylinder and the nozzle body. In addition, a gas nozzle is coaxially guided between the gas nozzle and the outer cylinder, and a gas nozzle guide for maintaining a shield gas passage space is connected to an outer periphery of the outer cylinder.
As for the material of the torch for vertical electrogas welding of the present invention, stainless steel or the like is preferable for the gas nozzle and the outer cylinder in consideration of corrosion due to the atmosphere during welding and the like. Further, it is desirable that the nozzle body is made of a copper alloy in consideration of electric conduction.

[0009]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a torch for vertical electrogas welding according to the present invention. FIG. 3 is a longitudinal sectional view showing a specific example of a torch for vertical electrogas welding.
(A), (b), (c), A-A 'and B- in FIG.
It shows a configuration in a line cross section of B ′ and CC ′.

A gas nozzle 32 having a desired length and diameter and having a circular cross section is connected to a gas relay fitting 31 for sending a shielding gas to the gas nozzle 32 by means such as brazing at a rear portion 32b of the gas nozzle 32. I have. An insulating material 48 is mounted on the outer periphery of the gas nozzle 32.
An outer cylinder 34 is inserted into the gas nozzle 32, and the outer cylinder 3
A nozzle body 36, which is slightly longer than the outer cylinder 34 and has a power supply tip 40 fixed at the end thereof, is mounted in the inside 4. The outer cylinder 34 has a water supply / drain pipe 4 near its rear end.
In this configuration, a water relay fitting 37 connecting the fifth and the fourth 46 is connected.

The front part 36a and the rear part 3 of the nozzle body 36
6b is tightly attached to the inner circumference of the outer cylinder 34 by brazing, and is fixed to the inner circumference of the outer cylinder 34 by brazing.

The front portion 36a serves as a power supply chip mounting portion for screwing the rear end of the power supply chip 40 as shown in the figure, and the other rear portion 36b serves as an introduction portion for a wire fed through a conduit (not shown). ing. Nozzle body 36
Is formed at the center thereof with a wire insertion hole 35 penetrating therethrough. Further, the front and rear portions 36a, 36b of the nozzle body 36
Between the nozzle body 36 and the outer cylinder 34 between the two, two chambers 42 and 43 serving as a cooling water supply channel and a drainage channel defined by the nozzle body 36 are formed to extend in the axial direction, These chambers 42, 43 are respectively
5, 46.

The gas nozzle 32 whose rear end portion 32b is connected and supported by the relay bracket 31 is 10 times higher than the front portion 34a of the outer cylinder 34.
Gas nozzle guide 33 (spacer) at about 0 mm
In the drawing, three gas nozzle guides 33 are provided in the circumferential direction between the gas nozzle 32 and the outer cylinder 34 to be held concentrically with the outer cylinder 34, and a gas passage 47 is provided between the outer cylinder 34 and the gas nozzle 47. Is formed. Gas relay fitting 31 is O
It is connected to a water relay fitting 37 by a bolt 39 via a ring 38 and is integrated therewith.

FIG. 4 (b) shows an example of the configuration taken along the line BB 'of FIG. 3; the nozzle body 36 is inscribed at two places on the inner surface of the outer cylinder 34 and is divided into two independent chambers 42 and 43.
Further, a gas nozzle guide 33 is provided between the gas nozzle 32 and the outer cylinder 34 as shown in the figure to connect the two on the circumference, maintain a shield gas passage, and
The structure is such that the shielding gas is released. FIG. 4A is a cross-sectional view taken along the line AA 'of FIG. 1 and the chambers 42 and 43 formed separately and separated from each other, that is, a passage communicating with the front portion 36a of the nozzle body 36. 41 are formed. FIG. 4C shows C-
A water relay fitting 37 is connected to a water supply pipe 46 and a drain pipe 45, and the outer cylinder 34 and the nozzle body 36
The pipes for supplying and draining the cooling water via the water relay fitting 37 are formed in the chambers 42 and 43 which are formed separately from each other. In addition, welding power is supplied by a water supply pipe 46 and a drain pipe 45 connected to the water relay fitting.

FIGS. 1 and 2 schematically show a vertical electrogas welding apparatus using a vertical electrogas welding torch according to the present invention. The gas relay box 17 shown in FIGS. As a means to eliminate the swing of
The apparatus has rotatable guide rollers 10 and 11, and the function of the apparatus is the same as that of the apparatus shown in FIGS. 5 and 6 described above. The guide rollers 10 and 11 are for correcting the deflection of the torch, and may be guides having no rotating mechanism as long as they have a small friction coefficient.

The above-mentioned torch 5 for vertical electrogas welding
Is held between a roller 7 driven by a lifting motor 6 and a pressure roller 9 pressed by a pressure screw 8, and is inserted into a groove with guide rollers 10 and 11 as guides.

The operation of the above welding apparatus will be described. The wire 25 is inserted into the insertion hole 3 of the torch 5 for vertical electroslag welding.
5, the torch 5 for vertical electrogas welding is sandwiched between the roller 7 and the pressure roller 9 as it melts, and rises by the rotation of the roller 7, and the welding proceeds. Further, the shielding gas supplied by the gas hose 27 is released as shown by an arrow 28 to shield the welded portion.

During welding, cooling water from a cooling water supply source connected to a water supply pipe 46 is supplied into the chamber 42, and the nozzle body 36 and the outer cylinder 34 are water-cooled. It is taken out from the drainage pipe 45. Further, the shielding gas is forcibly supplied from a gas supply source connected to the gas pipe 44, passes through the gas passage 47, and passes through the gas nozzle lower part 3.
It is released from 2a and shields the weld. Further, the wire 25 is fed from the nozzle body rear portion 36b to the wire insertion hole 35, protrudes from the power supply tip 40 attached to the nozzle body tip 36a, and is supplied to the welded portion.

[0019]

As described above, the vertical torch for electro-gas welding according to the present invention has a gas nozzle, an outer cylinder, and a nozzle body of two.
It has a heavy structure, and the gas nozzle guide contacts the inner surface of the gas nozzle and the water relay fitting and the gas relay fitting are connected to each other. Since there is no torch, the torch can be lifted smoothly. Further, since the gas nozzle is made non-consumable and integrated with the nozzle body, it rises with the progress of welding, so that it can be used repeatedly. Furthermore, if the torch for vertical electrogas welding has a sufficient length than the welding length, it is possible to perform welding from any short length to any long length within the range of the torch for vertical electrogas welding.

[Brief description of the drawings]

FIG. 1 is an overall view showing an example of a welding apparatus for applying a torch for vertical electrogas welding according to the present invention.

FIG. 2 is a side view of FIG. 1;

FIG. 3 is a sectional view showing a specific example of the torch of the present invention.

FIG. 4 is an example of a sectional structure of the torch of FIG.
(A), (B) shows a cross section taken along the line BB ', and (C) shows a cross section taken along the line CC'.

FIG. 5 is an overall view showing a welding apparatus for applying a conventional welding torch.

FIG. 6 is a side view of FIG. 5;

[Explanation of symbols]

 Reference Signs List 1, 1a, 2, 2a Workpiece to be welded 5 Torch for vertical electrogas welding 21 Welding torch 31 Gas relay fitting 32 Gas nozzle 33 Gas nozzle guide 34 Outer cylinder 35 Wire insertion hole 36 Nozzle body 37 Water relay fitting 38 O-ring 40 Feeding chip 42, 43 rooms 47 gas passages

Continuation of the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) B23K 9/173 B23K 9/29 B23K 9/02 B23K 25/00 B23K 9/00 101

Claims (1)

(57) [Claims] 1. A welding torch which is inserted into a narrow groove of a welding base material and can be pulled up in synchronization with a welding speed, a gas nozzle having a rear portion connected to a gas relay fitting, and a gas nozzle supported in the gas nozzle via a gas nozzle guide. And a nozzle body inserted and fixed to the outer cylinder and having a wire insertion hole in the center, and a chamber serving as a supply / drain passage of cooling water axially partitioned by the nozzle body inside the outer cylinder. formed, TatsuMuko electro-gas welding torch, characterized in that the outer tube rear has a structure which is connected and fixed to the water relay fitting with communicating the chamber at the front of the nozzle body.