Welding seam joint welding method

Abstract

The invention discloses a welding seam joint welding method. The method comprises the following steps that S1, a welding bead is divided into a plurality of welding sections, each welding section is welded by using a welding gun, and the two ends of each welding section are formed joints; and step S2, a continuous arc extinguishing method is adopted at the joints, so that the solidification time difference between the surface metal of the joints and the bottom metal of the joints is 0.3s to 0.7s; the action direction of the welding gun is perpendicular to a welding direction; the continuous arc extinguishing method comprises the steps of performing arc extinguishing and spot welding operation at an interval in sequence at the joints, and performing the arc extinguishing as ending after atleast two times of the operation. According to the welding seam joint welding method, the continuous arc extinguishing method is adopted at the joints, so that the metal of the joints is slowly cooled, the solidification time difference between the surface metal and the bottom metal is reduced, so that the surface metal still has mobility during solidification and shrinkage of the bottom metal, gaps generated at the bottom of the bottom metal can be supplemented, shrinkage holes are prevented from being generated, the welding gun is perpendicular to the welding direction, so that the forming coefficient of the welding seam is improved, and the impurities can be discharged more quickly.

Description

technical field [0001] The invention relates to the field of welded connection assembly between ship components, in particular to a welding method for welded seam joints. Background technique [0002] In the process of shipbuilding, ocean engineering and other steel structure manufacturing and assembly, it is often necessary to perform welding operations between assemblies for connection or fixing, especially in the field of hull manufacturing, because part of the hull structure is relatively large and thick, so It is often necessary to weld very wide and deep welds. In order to ensure that the weld has a certain interlayer temperature, multi-layer multi-pass welding will be used. At present, a relatively mature welding method is usually used in China: flux-cored arc welding, referred to as FCAW welding. For the multi-layer and multi-pass welds on this hull and similar structures, using this welding method is likely to cause shrinkage defects at the arc crater during weldi...

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is to solve the defect of shrinkage cavity at the bottom of the weld seam when the bottom metal is solidified slower than the upper metal at the joint of the weld seam when the arc is closed, and to provide a weld seam joint welding method

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