JPH0222159Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Field of Industrial Application) The present invention relates to the shape of a backing material used for single-sided welding of various structures.

(Prior art and its problems) When building structures by welding in shipbuilding, architecture, bridges, etc., it is often impossible to weld both sides.
For this reason or for the purpose of saving time and effort in the welding process, single-sided welding is widely practiced, and a backing material is used in this single-sided welding to form an underwave bead.

Conventional backing material for single-sided welding is, for example, disclosed in Japanese Patent Application Laid-open No. 1983-
Like the backing material disclosed in Japanese Patent No. 61594, a backing material having a shape in which a slug pocket is provided in the central longitudinal direction of a solid material is generally used. Although this slag pocket is important in obtaining a healthy back bead, it also has the disadvantage that molten slag tends to flow in the direction of welding progress, resulting in a deterioration of the original function of the slag.

(Means/actions for solving the problems) The present invention aims to solve the problems of the conventional backing material mentioned above, and its gist is to This backing material for single-sided welding has protrusions provided at intervals on a slag pocket recessed in the slag pocket. The present invention will be explained below with reference to the drawings.

Fig. 1 is an overall perspective view of one specific example of the present invention;
Figure a is a diagram of its usage state, and Figure 2b is a diagram of Figure 2a.
It is an IB-IB diagram.

1 is a solid material such as a heat-resistant ceramic tile, which has a rectangular cross section, and has a slug pocket 4 in the longitudinal direction of the center of the upper surface (the surface in contact with the groove). Reference numeral 2 designates a tape for attaching a backing material made of a flexible heat-resistant material such as Al foil for attaching the solid material 1 to the back surface of the groove 6 of the material to be welded 5, and is configured to be wider than the solid material 1. The tape 2 is coated with adhesive on one side, the solid material 1 is continuously lined up and pasted in the longitudinal direction at the center of the coated surface, and the peeling tape 3 that is peeled off when using a backing material is pasted on both ends in the longitudinal direction. There is.

The above is an aspect of a conventionally known backing material for single-sided welding, and the backing material of the present invention further has a protrusion 7 formed on a part of the slug pocket 4 provided on the upper surface of the solid material 1. The protrusions 7 are arranged at predetermined intervals in the longitudinal direction of the slug pocket 4 when viewed from the entire material. As is clear from FIGS. 2a and 2b, this protrusion 7 functions as a weir for the molten slag flowing longitudinally through the slag pocket during welding (for example, single-sided welding with flux-cored wire), and as a result, the solid material 1 A slag layer is formed uniformly between the back bead and the back bead, and a glossy and uniform back bead is formed.
However, the thickness of the protrusion 7 should be such that it will be melted by welding heat (several thousand degrees centigrade) so as not to affect the shape of the back bead reinforcement. That is, the thickness of the protrusions 7 needs to be thick enough to function as a dam for the flowing molten slag, and suppressed to a thickness that does not affect the shape of the back bead. This thickness should be appropriately determined depending on the type of welding, etc., and cannot be determined uniformly.

In addition, in the example shown above, the solid material is a short tile-shaped solid material, which is arranged continuously on the tape for attaching the backing material. Of course, it is also possible to adopt a mode in which a rise is provided.

(Effects of the invention) As described above, according to the backing material for single-sided welding of the present invention, excessive flow of molten slag is suppressed during welding, and the original function of molten slag shines, resulting in a glossy and uniform welding material. It is very effective in forming the back bead.

[Brief explanation of the drawing]

FIG. 1 is an overall perspective view showing a specific example of the present invention;
Figure 2a is a usage state diagram of the backing material of the present invention, Figure 2b
The figure is the IB-IB diagram. 1...Solid material, 4...Slag pocket, 7...
Convexity.

Claims (1)

[Scope of utility model registration request] A backing material for single-sided welding consisting of a slug pocket recessed in the longitudinal direction of the center of the upper surface of a solid material, and protrusions provided at intervals.