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Post Weld Heat Treatment is a standard and mandatory process in the oil, gas and petrochemical industries to reduce residual stresses arising from welding steel components together.

Industry codes may require testing depending on the chemical makeup and thickness of material being tested, while testing also ensures optimal mechanical and metallurgical properties.

Definition

Post Weld Heat Treatment (PWHT) is a process which dissipates residual stresses in welded structures by reducing or redistributing them, hardness levels, improving ductility, and mitigating brittle fracture. PWHT is an integral component of welding procedures and required steps in many pressure vessel and piping codes; its necessity depends on various factors including the material’s chemical makeup and thickness; though not always essential it can significantly decrease likelihood of weld failures while meeting code requirements.

welding is an integral component of equipment and pipeline construction, but welding operations may accidentally introduce residual stresses into metal that reduce its strength, leading to decreased resilience against damage or failure. To mitigate this issue, PWHT (Post Weld Heat Treating) is often performed after welding to mitigate thermal stresses in the weld area through controlled annealing process at low temperature for an extended period. PWHT may also be used depending on welding type and material to control hardness or increase material strength.