Welding method of pipe head of heat exchange equipment

Abstract

The invention relates to the technical field of petrochemical engineering heat exchange equipment and welding methods, in particular to a welding method of a pipe head of heat exchange equipment. Thewelding method of pipe head of the heat exchange equipment comprises the following steps that S1, an arc groove from outside to inside is machined out at a plate hole insertion end of a pipe plate; S2, a heat exchange pipe is inserted into the plate hole from the insertion end, and the pipe head of the heat exchange pipe extends out from the arc groove; S3, self-melting is conducted on the pipe plate at the position of the arc groove, melt exactly fills the gap between one section of the heat exchange pipe and the plate hole, and a weld joint base layer is formed; S4, filler wire welding is adopted to fill the arc groove, so that a weld joint middle layer is formed; S5, a weld joint top layer is formed by adopting filler wire welding again on the middle layer. By the adoption of the welding method, the weld joint quality between the heat exchange pipe and the pipe plate is improved, the probability of a incomplete-penetration weld joint and bubbles in the weld joint is reduced, and thepull-off strength of the weld joint is improved.

Description

technical field [0001] The invention relates to the technical field of petrochemical cold exchange equipment and welding methods, in particular to a method for welding pipe heads of cold exchange equipment. Background technique [0002] Typical equipment for cold exchange equipment in the petrochemical industry are heat exchangers and air coolers, and both heat exchangers and air coolers need to bear a certain force during operation. The pressure mainly comes from the internal pressure generated by the equipment medium on the equipment and by Stress caused by thermal expansion and contraction. The above two forces will directly reduce the service life of the equipment, especially as the service life increases, leakage accidents often occur at the welding seam connection position between the heat exchange tube and the tube sheet, which accounts for a large proportion of safety accidents. [0003] Therefore, people put forward high requirements on the weld seam bearing capaci...

AI Technical Summary

Problems solved by technology

In the actual welding process, people often directly use solder for filling welding; but after welding, the weld seam is subjected to radiographic inspection, and the weld seam often has two defects. The main defect is incomplete penetration, and secondly, there are a certain number of welding bubbles

Images