SU565944A1 - Method of treating welded joints - Google Patents

Description

(54) METHOD FOR PROCESSING WELDED JOINTS

one

The invention relates to welding engineering manufacture, in particular to the methods of processing welds, made by iQjii argon-arc or microplasma:

One of the defects in welds made by argon-arc and microplasma methods is an undercut of the weld, which reduces the strength of the welded joint.

The known method of treating welded joints for eliminating undercutting and increasing the radius of conjugation of the base metal and the weld, consists in the imposition of fillet welds, i.e., re-welding of the undercut location. The fillet welds are made by arnon-arc welding using voltaic electrodes using filler wire or removing the boundary of the seam.

However, in the mass production of critical parts, for example, in the manufacture of high-strength, particularly thin-walled pipes, this method is ineffective due to the difficulty in complying with the specified technological regimes.

Another method of processing welded joints is that in the welding procedure, when the metal is in a ductile state, for example, in the stability range of austenite, it is estimated that the weld and the heat-affected zone. This increases the strength of the seam, however, the seam recess is not eliminated.

The aim of the invention is to eliminate undercut weld.

The proposed method for treating welded joints, mainly pipes, involves heating the weld to a plate condition and plastic deformation, the weld, which is carried out by slumping the pipe ends towards each other.

FIG. 1 shows a weld with undercut; in fig. 2 and 3 - two stages of processing of the weld according to the proposed method; in fig. 4 - finished welded coe-i articulation.

The proposed method is carried out as follows.

A welded product 1, for example, a pipe welded by the argon-arc method, a space under the heating element (for example, a high-frequency inductor) so that the main heating of the metal occurs in zone 2 of the undercut of the weld 3 (Fig. 2); heat can be used for welding. After heating the undercut zone to the plasticity temperature of the metal, the pipe is fed to the ycTpoiiCTBO crimping roll (or crimping ring), where the heated place is precipitated {FIG. 3) until the desired thickening (Fig, 4). As a result of precipitation, the thickness of the heated place increases, the local stealing is. This does not disappear, and smooth interfacing of the isha with the base metal is formed. The process is self-regulating, since under the action of the applied force the thinning zone is deformed compared to the main broom and the thickening-i

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W.J

Heating

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Claims (1)

FIG. CH dTCH. First of all, regardless of the nature and location of the undercut. The described method allows to reliably eliminate the undercut of the seam during mass production of welded pipes, to achieve a smooth transition of the base metal to the seam, thereby increasing the strength properties of the welded joint. Claims The method of treating welded joints, mainly pipes, involves heating the weld to a ductile metal condition and plastic deformation, which is characterized by the fact that, in order to eliminate the undercut of the weld, plastic deformation is carried out by slumping the pipe ends towards each other.