Thermal treatment process for weld of intermediate-diameter alloy pipeline

Abstract

The invention discloses a thermal treatment process for a weld of an intermediate-diameter alloy pipeline. The thermal treatment process is characterized in that the process includes the following steps of (1) preparation before welding, (2) preheating before welding and (3) welding; in the step of welding, firstly, thermocouples are symmetrically arranged on the two sides of the weld edge of the welded pipeline, when thermal treatment is carried out, a rectangular heating piece is unfolded and surrounds the weld for a circle, a 16# iron wire is used for binding the rectangular heating piece, and a heater is attached to the pipeline wall; secondly, as for the weld in the horizontal fixed position, the heat preservation thickness of the lower portion should be slightly larger than that of the upper portion, the temperature is increased to a heating temperature and is basically uniform, constant-temperature time starts to be calculated when the temperature difference is smaller than 50 DEG C, and in the cooling process, operation is conducted. The thermal treatment process is simple, multiple repeated procedures are omitted, and work efficiency is improved.

Description

technical field [0001] The invention relates to a heat treatment process for welding joints of alloy middle-diameter pipelines. Background technique [0002] At present, the heat treatment process of welded joints of alloy medium-diameter pipes is relatively complicated, and there is no unified specification and standard, resulting in uneven welding quality. Many repeated processes also make production efficiency low, increase the labor burden of workers, and make products market competitiveness is not high. For some operators who have just entered the industry, there is no clear method and process, resulting in frequent mistakes and omissions during operation, and may even cause serious consequences. Contents of the invention [0003] In view of the above-mentioned defects of the prior art, the technical problem to be solved by the present invention is to provide a heat treatment process for the welding joint of the alloy medium-diameter pipeline. The heat treatment proc...

AI Technical Summary

Problems solved by technology

[0002] At present, the heat treatment process of welded joints of alloy medium-diameter pipes is relatively complicated, and there is no unified specification and standard, resulting in uneven welding quality. Many repeated processes also make production efficiency low, increase the labor burden of workers, and make products The market competitiveness is not high

For some operators who have just entered the industry, there is no clear method and process, resulting in frequent mistakes and omissions during operation, and may even cause serious consequences