JP2002144086A - Push-up device for backing welding - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a push-up device for backing welding in which close attachment of a backing used in a one side welding is excellent, the welding heat input is reduced, and the welding deformation is suppressed to the minimum. SOLUTION: A base 2 is supported by an air cylinder 1, a coil spring 5 is fitted through a guide bar 4 fixed to the base 2, a holding plate 6 is supported by the coil spring 5, the backing 7 is placed on the holding plate 6, the backing 7 is pushed up by the air cylinder 1, and pressed thereagainst by the coil spring 5. A space is provided between the coil spring 5 and the guide bar 4 to allow the backing 7 to be oscillated. In addition, heat transfer radiating plates 10 and 13 are brought into contact with upper and lower surfaces of a steel plate 8 to be welded across a joint part of the steel plate 8 to be welded so as to radiate the welding heat input outwardly.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for pushing a backing material used in one-side welding.

[0002]

2. Description of the Related Art Single-side welding is performed in various uses such as joining steel materials. Single-sided welding is performed by attaching a backing material to the back surface of the welded steel plate.However, in the joint welding, bending occurs in the joint direction, and there is a difference in plate thickness at the joint. May be. For this reason, the adhesion of the backing material is often not sufficiently good.

[0003] When performing single-sided welding, if the adhesion of the backing material is poor, there is an inconvenience that good welding cannot be obtained due to burn-out during welding or fluctuation of the back bead. At present, as a backing material, for example, an operator manually attaches a plate-shaped ceramic plate with an aluminum tape.

In submerged arc welding,
An air hose is provided in the frame, a backing jig provided with a backing plate or a flux bag in contact with the air hose, and a backing flux is sprayed on the backing plate or the flux bag. Is pressed against the back of At this time, in order to bring the backing flux into close contact with the steel plate to be welded, the air hose is inflated in the frame body to push up the backing plate or the like to bring the backing flux into close contact.

[0005] That is, the bending of the welded steel plate in the joint direction and the decrease in the adhesion of the backing material due to the difference in plate thickness are compensated for by the scatter height of the flux as the backing material. In addition, in the case of this method, since the plate is simply pushed up with an air hose, even if the plate-shaped backing material is applied using this method, the backing due to the bending in the joint direction of the welded steel plate or the difference in the plate thickness. It cannot compensate for the decrease in the adhesion of the material.

When performing single-sided welding, the amount of heat input to one side is increased, and the bending of the steel plate to be welded in the joint direction, that is, welding deformation is increased. Therefore,
It is necessary to minimize the welding deformation, but there has been no effective means for minimizing the welding deformation.

[0007]

SUMMARY OF THE INVENTION The present invention focuses on the fact that when performing single-sided welding, it is important to apply a backing material with good adhesion to perform good welding. It is an object of the present invention to obtain a backing material push-up device that improves the adhesion of a material, and to obtain a means attached to the backing material push-up device to reduce heat input and minimize welding deformation. .

[0008]

Means for Solving the Problems A main body girder is provided between bogies running across a joining platen for supporting a welded steel plate, an air cylinder is erected on the girder, and the board is supported by the air cylinder. Is provided, and a coil spring is provided which is attached by being inserted through a guide bar fixed to the substrate, a holding plate is supported by the coil spring, a backing material is placed on the holding plate, and air is applied to the backing material. The cylinder was pushed up to the welded steel plate surface, and the coil spring pressed against the welded steel plate surface.

In addition, a gap is provided between the coil spring and the guide bar so that the holding plate can swing and swing. Further, a column is erected on the carriage, an upper frame is provided on the column, a heat conduction radiating plate is provided on the upper frame via a top holding jig, and a heat conduction radiation plate is provided on the substrate via a bottom holding jig. A plate was provided, and a heat conduction radiating plate was brought into contact with a welded steel plate with a joint portion interposed therebetween so that heat input could be radiated to the outside.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a front view of a jig portion of the backing material lifting device of the present invention, and FIG. 2 is a perspective view schematically showing the backing material lifting device.

In the drawing, 1 is an air cylinder, 2 is a substrate of a backing jig supported by the air cylinder 1, and 3 is a substrate 2
It is a frame for fixing the guide bar 4 and the coil spring 5 fixed thereon. In the case of this example, the guide bar 4 is screwed into the frame 3 and a guide bolt fixed with a nut is used. Note that the substrate 2 and the frame 3 may be an integral frame.

The coil spring 5 is mounted on the frame 3 with the guide bar 4 inserted through the center.
In a free state, the coil spring 5 projects from the tip of the guide bar 4. Further, the diameter of the guide bar 4 is smaller than the inner diameter of the coil spring 5, and an interval is formed between the guide bar 4 and the coil spring 5.

Reference numeral 6 denotes a pressing plate for backing, which is fixedly supported by the coil spring 5. 7 is a backing material,
It is mounted on the holding plate 6, pushed up to the welded steel plate 8 by the air cylinder 1, and pressed against the welded steel plate 8 by the coil spring 5.

Reference numeral 9 denotes a lower surface holding jig attached to the substrate 2, on the upper surface of which a heat conductive radiation plate 10 is attached. As the heat conducting radiation plate 10, a heat absorbing copper plate or the like is used. Then, when the substrate 2 is pushed up by the air cylinder 1, the heat conduction radiation plate 10 is pressed against the back surface of the welded steel plate 8.

Reference numeral 11 denotes an upper surface holding jig which is attached to the upper frame 12 of the main body so as to be able to move up and down. The lower surface of the jig has a heat conduction radiating plate 13 attached thereto. They come into contact with each other and stop the upward movement of the welded steel plate 8. Upper and lower heat conduction radiation plates 10 and 13
Are arranged along the joint portion with the joint portion of the welded steel plate 8 interposed therebetween, and constrain the joint portion.

Reference numeral 14 denotes a main body girder, and the air cylinder 1 is mounted on the main body girder 14. The main body includes left and right trolleys 15 capable of running, a support 16 erected on the trolley 15, a main body girder 14 supported between the left and right trolleys 15, and an upper frame 12 fixed to the left and right supports 16. , And supports the welding steel plate 8,
It travels across the platen plate 17 to be welded, and the platen platen 1
7 between the lattices 17 'of the substrate 7 by the air cylinder 1.
Is raised and lowered.

The upper holding jig 11 is attached to the upper frame 12 via a screw bolt or the like, and can be moved up and down in accordance with the thickness of the welded steel plate 8. Therefore, at the time of backing, it is adjusted so as to be in contact with the surface of the welded steel plate 8 according to the thickness of the welded steel plate 8 arranged on the lattice 17 ′ of the plate joining plate 17.

The configuration of the present invention is as described above. Next, the operation thereof will be described. First, when the welded steel plate 8 is set on the platen table 17, the bogie 15 is used to move the main body to the weld joint position. Then, the upper surface holding jig 11
Is adjusted so that the heat-conducting radiation plate 13 comes into contact with the surface of the welded steel plate 8.

Next, after placing the backing material 7 on the holding plate 6, the air cylinder 1 is operated to push up the substrate 2. At this time, the stroke of the air cylinder 1 is adjusted so that the backing material 7 is pushed up to the lower surface position of the welded steel plate 8 and the heat conduction radiation plate 10 of the lower surface holding jig 9 is in contact with the back surface of the welded steel plate 8. Is set. In this state, the backing material 7 is pressed against the back surface of the welded steel plate 8 by the elastic force of the coil spring 5.

Therefore, the heat conduction radiating plates 10 and 13 are in contact with the front and back surfaces of the welded steel plate 8 with the welded joint portion of the welded steel plate 8 interposed therebetween, thereby restraining the welded joint portion and the backing material 7 on the back surface. Are brought into close contact with each other. In this state, backing single-side welding is performed. Reference numeral 18 denotes a welding torch.

By the way, with the start of welding, the welded steel plate 8 bends in the joint direction due to welding heat input.
In some cases, steel plates having different thicknesses are welded. However, according to the backing jig of the present invention, since the backing material 7 is pressed by the coil spring 5 that can swing and swing, the welding steel plate 8 is deformed. On the other hand, the backing material 7 follows, and the adhesion can be maintained.

Further, the welded joint is sandwiched between the welded steel plates 8.
Since the heat conduction radiating plates 10 and 13 are in contact with the front and back surfaces, the welding heat input can be actively radiated to the outside, the apparent heat input is reduced, and welding deformation is minimized. be able to.

[0023]

According to the present invention, when performing single-sided welding, the backing material can follow the deformation of the welded steel plate, the adhesion of the backing material can be enhanced, and good welding can be performed. became. In addition, by actively dissipating the heat input to the outside to the outside, welding deformation can be minimized.

Moreover, a heat conducting radiating plate for dissipating heat input from the welding is attached to the backing material pushing-up device, and the welding joint of the welded steel plate can be restrained by the heat conducting radiating plate. . As a result, an effective backing material lifting device can be obtained with a simple configuration.

[Brief description of the drawings]

FIG. 1 is a front view of a backing jig portion of a backing material pushing-up device of the present invention.

FIG. 2 is a perspective view schematically showing the backing material pushing-up device.

[Explanation of symbols]

REFERENCE SIGNS LIST 1 air cylinder 2 substrate 3 frame 4 guide bar 5 coil spring 6 holding plate 7 backing material 8 welded steel plate 9 bottom holding jig 10 heat conduction radiating plate 11 top holding jig 12 upper frame 13 heat conduction radiating plate 14 main body girder 15 cart 16 Prop 17 Plate joint plate 18 Welding torch

Claims (4)

[Claims] 1. A main body girder is provided between carts running across a plate joining platen for supporting a welded steel plate, an air cylinder is erected on the girder, and a substrate is provided by being supported by the air cylinder. Providing a coil spring that is attached by inserting a guide bar fixed to the substrate, supporting the holding plate on the coil spring, placing a backing material on the holding plate, and moving the backing material to the welded steel plate surface with an air cylinder A welding backing material pushing-up device characterized in that it is pushed up and pressed against a surface of a welding steel plate by a coil spring. 2. The welding backing material lifting device according to claim 1, wherein a gap is provided between the coil spring and the guide bar so that the holding plate can swing. 3. A column is erected on a carriage, an upper frame is provided on the column, a heat conduction radiating plate is provided on the upper frame via an upper surface pressing jig, and a substrate is provided via a lower surface pressing jig. 3. The heat conduction radiation plate according to claim 1, wherein a heat conduction radiation plate is provided, and the heat conduction radiation plate is brought into contact with the welded steel plate with the joint portion interposed therebetween so that heat input can be radiated to the outside. Welding backing material lifting device. 4. The apparatus for pushing up a welding backing material according to claim 3, wherein an upper surface holding jig is mounted on the upper frame so as to be vertically movable.