Welding method for welded joints

Abstract

The invention discloses a welding method for a welded seam joint, which includes step S1, dividing a welding bead into several welding sections, using a welding torch to weld each welding section, and forming a joint at both ends of each welding section; S2. The continuous arc extinguishing method is adopted at the joint, so that the solidification time difference between the surface metal of the joint and the underlying metal is 0.3s to 0.7s; the action direction of the welding torch is perpendicular to the welding direction; the continuous arc extinguishing method refers to the arc extinguishing and arc extinguishing at the joint at intervals. The spot welding operation is repeated at least two rounds and then the arc ends. The welding method of the weld joint provided by the present invention adopts the continuous arc extinguishing method at the joint to slowly cool the metal of the joint, reduce the time difference between the solidification of the surface metal and the underlying metal, and make the surface metal still flow when the underlying metal solidifies and shrinks It can supplement the gap generated at the bottom and avoid shrinkage cavity. The way that the welding torch is perpendicular to the welding direction improves the weld forming coefficient and makes the impurities discharge faster.

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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