Submerged-arc welding root welding and back chipping process of thick plate with K-type groove

Abstract

The invention discloses a submerged-arc welding root welding and back chipping process of a thick plate with a K-type groove. The K-type groove is an asymmetric K-type groove, an upper open angle and a lower open angle of the groove are both 45 degrees to 50 degrees, and truncated edges are not reserved at the root. During assembly, groove clearance of 2mm to 3mm is reserved. During welding, solid gas protection welding wires under pulse current are adopted for backing welding of a root pass of the front side of a K-type groove test piece, and after the root pass is thoroughly fused, a part of weld metal penetrates through the reverse side of the groove to achieve backing welding. After welding, back chipping of the reverse side is performed. Finally, gas shielded welding under large current is adopted for fusion welding of the roof of the reverse side groove, and gas rich in argon is used as protective gas. The submerged-arc welding root welding and back chipping process reduces time for slag removal of root pass of submerged-arc welding and polishing and finishing of the reverse side groove of the welding test piece, improves welding efficiency by more than 30%, removes a carbon arc gouging process, decreases welding noises and dust emission, lowers labor intensity of welders and reduces time for damaging workers under high-decibel noises.

Description

technical field [0001] The invention relates to a welding process technology, in particular to a submerged arc welding root welding and root cleaning process of a K-shaped groove thick plate. Background technique [0002] In the submerged arc welding of thick plates with K-shaped grooves, due to the limitation of the grooves and the relatively large welding line energy of the submerged arc welding, it is difficult to remove the slag from the root of the groove, and the root of the groove is cleaned It is more difficult. When welding thick plates in factories and laboratories, carbon arc gouging is generally used for root cleaning on the back side. In order to ensure thorough root cleaning, carbon arc gougers can easily plan a root groove on one side of the straight side, making the root of the straight side in a concave arc shape, and the straightness of the reverse groove after gouging is poor , This not only increases the difficulty of grinding but also easily leads to w...

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a submerged arc welding root welding and root cleaning process for K-shaped groove thick plates, so as to solve the problem that the carbon arc gouging process used in the existing submerged arc welding root cleaning process has high labor intensity and labor load. The big problem is to remove the labor-intensive and labor-intensive carbon arc gouging process, simplify the difficulty of root cleaning and slag removal in submerged arc welding of thick plates, and improve the welding efficiency and efficiency of submerged arc welding of K-shaped groove thick plates Reduce the labor intensity of workers

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