Welding technology for single-surface welding and double-surface forming

Abstract

The invention discloses a welding technology for single-surface welding and double-surface forming. The technology comprises the following steps: (1) forming a Y-shaped groove at a weld joint; and cleaning the groove; (2) obliquely arranging a workpiece, wherein the weld joint is upward, and the arc starting end is higher than the arc ending end in welding; and (3) welding from the arc starting end to the arc ending end in a gas protecting welding manner, wherein a welding wire and the weld joint are in the same vertical plane during welding, and the welding wire is inclined relative to the weld joint, and the front end of the welding wire is close to one side of the arc starting end. According to the technology for welding, molten metal can flow along the weld joint; an operator controlsthe welding speed through the welding wire so as to control the formation quality of the weld joint, thus the molten metal is prevented from forming weld flash on the rear surface, and moreover, defects of incomplete permeating and incomplete fusion can be avoided; the quality of the weld joint is improved; the difficulty in welding is reduced; the operation is simple; and the efficiency is high.

Description

technical field [0001] The invention relates to a process method for welding pressure vessels or pressure pipes, especially a CO 2 Gas-shielded single-sided welding and double-sided forming welding process. Background technique [0002] Roll welding is one of the main processing methods of pressure vessels or pressure pipes. This method is to bend the plate-shaped metal material, and the straight sides of the material are connected to each other to form a weld parallel to the axis of the workpiece. Finally, through welding way of splicing. [0003] In the welding of pressure vessels or pressure pipes, all butt welds are required to be full penetration welds. However, due to the limitation of the structure and size of the workpiece, double-sided welding cannot be carried out. Therefore, it is required to achieve single-sided welding and double-sided forming in the first welding. , lack of fusion, super high weld seam, or weld bumps and other defects, the weld seam quality ...

AI Technical Summary

Problems solved by technology

However, due to the limitation of the structure and size of the workpiece, double-sided welding cannot be performed. Therefore, it is required that the first welding of the bottom layer should be performed on one side and double-sided forming. This requires very high welding technology for the operator, and it is easy to cause incomplete penetration of the back side. , lack of fusion, super high weld seam, or defects such as weld bumps, poor weld seam quality, potential safety hazards, and low efficiency

[0004] On the other hand, since the inner wall of the workpiece is cylindrical, the lining plate cannot be used during welding, which further increases the difficulty of welding

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