Post-weld heat treatment
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The welds of those pipes require post-weld heat treatment
Determined based on the material and thickness of the pipe, etc
Most industrial pipes require post-weld heat treatment to avoid stress concentration and optimize the microstructure
Based on the material of the pipe, such as alloy steel, etc.; based on the thickness of the pipe, such as ordinary carbon steel with a thickness over 25 millimeters; based on the medium flowing through the pipe, such as hydrogen-handling pipelines, alkali pipelines, etc
Just follow the GB/T30583—2014 Code for Post-Weld Heat Treatment of Pressure Equipment
1 Extremely or highly hazardous to humans. 2 Pipes with stress corrosion. 3. The drawings specify that stress-relief heat treatment after welding is required. Additionally, there are factors such as the material of the pipe, its strength, thickness, and degree of deformation, all of which depend on the requirements specified in the drawings.