JP3226691B2 - Backing equipment for single side welding - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a cracking is applied to the lower surface side of the butt joint, rolls along to the person projecting alignment joint Urato
The present invention relates to a single-sided welding backing device provided with a member .

[0002]

BACKGROUND ART lining device for the one-sided welding, since the backing member rolls along the butt joint, together with the unnecessary length of the backing member corresponding to the weld length, along the curved surface Although it has the advantage of being able to cope with the formed butt joint, the contact area between the weld metal and the backing member is small, and the contact time is short, so that the welding is not sufficiently cooled and is separated from the backing member. The back surface of the metal comes into contact with air (for example, see Japanese Patent Application Laid-Open No. 5-8091).

[0003]

Therefore, there is a disadvantage that the back surface of the deposited metal immediately after leaving the backing member is easily oxidized by oxygen in the air. The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a backing device for single-sided welding in which the back surface of the deposited metal is less likely to be oxidized.

[0004]

Characterizing feature of the present invention for achieving the above object, according to an aspect of the Bei We have applied to the lower surface side of the butt joint, a backing member which rolls along those projecting alignment joint
The backing device for single-sided welding obtained , wherein an enclosing plate surrounding the peripheral surface of the backing member is provided along a circumferential direction of the backing member, between the peripheral surface of the backing member and the enclosing plate. But,
The point is that a supply path for supplying a shield gas to the back surface of the deposited metal is formed.

[0005]

The shield gas is supplied to the back surface of the weld metal immediately after leaving the backing member, so that the back surface of the weld metal is hardly oxidized. However, the shield gas flows along the peripheral surface of the backing member. While being sprayed on the back surface of the weld metal, both the peripheral surface of the backing member and the back surface of the weld metal are effectively cooled by the shielding gas, which can promote the cooling of the weld metal. When the surface is formed of a metal such as copper, oxidation of the peripheral surface can be suppressed.

[0006]

Therefore, the supply of the shielding gas to the back surface of the deposited metal and the promotion of cooling of the deposited metal are synergistically prevented from oxidizing the back surface of the deposited metal. In particular,
When the peripheral surface of the backing member is formed of a metal such as copper, the peripheral surface is cooled, so that oxidation of the peripheral surface of the backing member can be suppressed, so that the durability of the backing member is improved. .

[0007]

FIG. 4 shows a single-sided automatic welding apparatus for manufacturing an outer wall of a cylindrical tank or the like by joining a stainless steel plate A which has been bent into a cylindrical shape by MIG welding from the outer peripheral side thereof. And a manipulator 4 supporting the supporting member 2 on a column 3 so as to be movable in the vertical direction and the boom longitudinal direction.
A MIG welding machine 7 holding the welding torch 5 in the weaving device 6, a wire feeder 9 for supplying a welding wire 8 to the welding torch 5, and a lower surface of a butt joint 10 of stainless steel plates A. The backing device 12 includes a roller-shaped backing member 11 that rolls in the direction of the arrow along the longitudinal direction of the butt joint 10, and a support roller 13 that supports the bent stainless steel plate A. MIG welding machine 7 and wire feeder 9
Is fixed to the main boom 1, and the backing device 12 is fixed to the sub-boom 2 in a state where the rotation center of the backing member 11 is located directly below the welding torch 5.

The backing device 12 includes a support arm 14 that rotatably supports the backing member 11, and a support arm 14 that uses a gas pressure of nitrogen gas supplied from a nitrogen gas supply pipe 15 through a pressure reducing valve 16. Cylinder 1 for driving up and down 14
7, a hood-shaped surrounding plate 19 surrounding the backing member peripheral surface 18 is provided along the circumferential direction of the backing member 11, and the cylinder 17 is moved around the vertical axis with respect to the sub-boom 2. It is configured to be rotatably movable so that the rolling direction of the backing member 11 can be changed.

As shown in FIG. 3, the backing member 11 is formed on an aluminum ring 21 rotatably supported on a support shaft 20 fixed to the support arm 14 and a rim 22 of the ring 21. A backing metal 23 made of copper is fitted in the circumferential groove, and the backing metal 23 is configured to be pressed against the lower surface of the butt joint 10 with a predetermined pressing force by the extension operation of the cylinder 17.

When a drum-shaped tank wall B is manufactured by butt-welding edges along a longitudinal direction of a stainless steel sheet A bent into a cylindrical shape, as shown in FIGS. With the steel plate A placed on the support roller 13 and the butt joint 10 fixed at a fixed position, the main boom 1 and the sub boom 2 are moved together without changing the relative positions of the MIG welding machine 7 and the backing device 12. , As shown by the arrow in FIG.
When welding is started while moving forward toward the tip side, the backing member 11 pressed against the lower surface side of the butt joint 10 rolls counterclockwise in FIGS. A predetermined underflow is formed on the back surface of the weld metal 24.

When the ends of two drum-shaped tank walls B obtained by welding a stainless steel plate A into a cylindrical shape are butt-welded to each other, the drum-shaped tank wall B is placed on a supporting roller 13 and FIG. As shown, the backing device 12 in which the rolling direction of the backing member 11 is changed by 90 ° by rotating the cylinder 17 and the MIG welding machine 7 are fixed at a fixed position, and the driving rotation of the support roller 13 is performed. When welding is started while rotating the two drum-shaped tank walls B in a counterclockwise direction in FIG. 5, the backing member 11 pressed against the lower surface side of the butt joint 10 is rotated in FIG. By rolling clockwise, a predetermined reverse wave is formed on the back surface of the weld metal 24.

As shown in FIG. 1 to FIG.
9 is fixed to the support arm 14 and surrounds the backing member portion on the upper side in the welding progress direction in a U-shape over an angle range of about 90 °, so that the distance from the backing member peripheral surface 18 is closer to the upper end side. A closing plate 25 is provided, which is arranged in a substantially fan shape in a side view in a narrowed state and closes a gap between the lower end of the surrounding plate 19 and the peripheral surface 18 of the backing member.

The backing member peripheral surface 18 and the surrounding plate 19
Is formed in a supply path 26 for supplying a shield gas to the back surface of the weld metal 24, and the nitrogen gas supply pipe 15 is connected to a through hole formed in the closing plate 25 via a flow rate control valve 29. Nitrogen gas as a shielding gas is sent into the supply passage 26 while being diffused through the filter 27, and flows along the peripheral surface 18 of the backing member while enclosing the enclosure plate 19.
It is sprayed on the back surface of the weld metal 24 from a U-shaped notch 28 in a plan view formed on the upper end side.

[Other Embodiments] Shielding gas types are nitrogen gas, argon,
An inert gas such as helium may be used. 2. A supply path may be formed so that the shielding gas is supplied to the back surface of the deposited metal from the lower side in the welding direction. 3. A supply path may be formed so that the shielding gas is supplied to the back surface of the deposited metal from the front and rear in the welding direction with the welding position interposed therebetween. 4. The length of the supply path is not particularly limited, and may be formed over substantially the entire circumference of the backing member except for the welding position. 5. The material of the backing material provided on the backing member is not limited to metal such as copper, and may be glass fiber or solid flux. 6. A cooling means for cooling the backing member from inside may be provided separately. 7. The backing device for single-sided welding according to the present invention may be used for various types of arc welding other than MIG welding.

In the claims, reference numerals are provided for convenience of comparison with the drawings, but the present invention is not limited to the configuration shown in the accompanying drawings.

[Brief description of the drawings]

FIG. 1 is a partial cross-sectional side view of a main part.

FIG. 2 is a plan view of a main part.

FIG. 3 is a sectional view of a main part.

FIG. 4 is a side view

FIG. 5 is a front view of a main part.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Butt joint 11 Backing member 18 Peripheral surface 19 Enclosure plate 24 Welded metal 26 Supply path

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-63-43767 (JP, A) JP-A-50-149561 (JP, A) JP-A-56-66379 (JP, A) 70480 (JP, A) (58) Field surveyed (Int. Cl. ⁷ , DB name) B23K 37/06 B23K 9/16

Claims (1)

(57) [Claims] 1. A cracking is applied to the lower surface side of the butt joint (10), rolls along the skilled projecting alignment joint (10) Urato
A backing device for single-sided welding comprising a backing member (11), wherein a surrounding plate (19) surrounding a peripheral surface (18) of the backing member (11) extends in a circumferential direction of the backing member (11). The space between the peripheral surface (18) of the backing member (11) and the enclosing plate (19) is formed as a supply path (26) for supplying a shielding gas to the back surface of the deposited metal (24). Backing equipment for single-sided welding.