JPS58148079A - Electric welding of material made of aluminum alloy - Google Patents

Abstract

PURPOSE:To enable easy finding of poor penetration of root part, by knurling over whole face of the root part of the groove of mterial to be welded, and abutting the root part to each other and performing electric welding. CONSTITUTION:Jagged flaws 13 are worked by a knurling tool over whole face of the root part 12 of the groove 11 of a material made of aluminum alloy. Jagged flaws 13 of the root part 12 are butted from left and right and electric welded by large current MIG welding. Even if poor penetration occurs in the root part 12 at the time of welding, it can be find out easily by radiographic inspection etc. as jagged part 13 is remaining.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of electric welding aluminum alloy materials.

When aluminum alloy materials are welded by high-current MIG welding, the amount of thermal contraction of the welded part is large, and as shown in FIG.
If defective weld penetration occurs, the root portion 12 will be in close contact with each other as shown in Fig. 2, and this problem will arise in that the defective weld penetration cannot be detected by radiographic testing or ultrasonic flaw detection. there were.

Conventionally, in order to solve this problem, as shown in FIG.
The method of welding by providing a

However, this method still has problems at present, such as the fact that it is extremely difficult to control the dimension of the gap a in an optimal j-method manner in accordance with the material, the wall thickness, etc. of the material.

The present invention was developed as a result of studies to solve the above-mentioned problems.

Therefore, an object of the present invention is to be able to weld the materials to be welded without creating a gap between the root portions of each groove, and even if a weld penetration defect occurs at the root portion, it can be corrected by radiographic testing or ultrasonic testing. The object of the present invention is to provide a method for electric welding aluminum alloy materials that can be easily detected by flaw detection tests.

That is, in the present invention, in the first part of the groove of each material to be welded,
The gist of this method is to electrically weld an aluminum alloy material by applying a roughness to the entire surface, and then electrically welding the root portion of the roughened material by contacting the phase 17.

Hereinafter, the present invention will be explained in detail by way of embodiments with reference to the drawings.

4 and 5 show embodiments of the present invention.
The figure is an explanatory cross-sectional front view showing a state in which the groove root portions of each welding material are in contact, FIG. 5 is an enlarged view of section A in FIG. 4, and FIG. FIG. 7 is an enlarged view of section B in FIG. 6, which is an explanatory cross-sectional front view showing a state where poor penetration has occurred in the welded part.

First, in this embodiment, a knurling machine (not shown) is used to cut the root portion 12 of the groove 11 of the material to be welded, that is, the aluminum alloy material 10.
After that, the root portions 12 of each material 10 with the uneven scratches 13 knurled are brought into contact with each other from the left and right sides as shown in FIG. Large current MIG belonging to welding
Electric welding is performed by welding (instead of a tungsten electrode, a filler metal electrode wire is continuously fed to generate an arc).

In addition, in the case of machining the uneven scratches 13 on the root portion 12 in this embodiment, the t([''-let machining machine) was used as described above, but this is different from using another machining machine to form the uneven scratches 13 on the surface of the root portion 12. Of course, it is also possible to create uneven scratches.

As described above, in the present invention, since the unevenness flaws 13 are formed over the entire surface of the root portion 12 of the groove 11 of each material 10 to be welded, in the event that the root portion 12 is melted as shown in FIG. Even if a portion with poor weld penetration occurs, unevenness flaws 13 will remain in this portion with poor penetration as shown in Fig. 7, and the root portion 12 will not be in close contact with each other as in the conventional one described above. can be easily detected by radiographic testing or ultrasonic testing.

Therefore, in the present invention, there is no need to provide a gap between the root portions of each groove as in the conventional welding method described above. As a result, in the present invention, the tacking work is extremely easy, and the workability of the welding work can be significantly improved.

[Brief explanation of drawings]

Figure 1 is a cross-sectional front view explanatory diagram showing the history of abutment of the groove root of each material to be welded using the conventional welding method, and Figure 2 shows poor penetration in the part welded using the conventional welding method. FIG. 3 is a cross-sectional front view explanatory diagram showing a state in which a gap is provided in the root portion of each groove, and FIGS. 4 is a cross-sectional front view explanatory diagram showing a state where the groove root portion of each welding material is in contact with each other, FIG. 5 is an enlarged view of part A in FIG. 4, and FIG. The figure is an explanatory cross-sectional front view showing a state in which poor penetration has occurred in a part welded using the method of the present invention, and FIG. 7 is an enlarged view of part B in FIG. 6. 10... Welded object Material, 11... Groove, 12... Root part, 16... Uneven scratches. 1st cause 2nd figure 2nd 6N figure 7

Claims (1)

[Claims] An aluminum alloy material characterized in that the root portion of the groove of each material to be welded is machined with a roughness over the entire surface, and then the root portions processed with the roughness are brought into contact with each other and electrically welded. electric welding method.