![]() When PWHT is required, a separate PWHT procedure is warranted. An example of the latter would be when PWHT is required for certain high strength low alloy steels to ensure the austenite has decayed to form martensite before the PWHT operation is performed. Some base metals have to be PWHT as soon as the welding is completed and other base metals have to cool to room temperature before PWHT can be initiated. PWHT can include tempering, stress relief, normalizing, or annealing. This is true regardless of the welding standard that applies to the work. PWHT is an essential variable that has to be addressed when the welding procedure is qualified and it has to be addressed by the welding procedure specification. Different metals respond differently to different heat treatments. ![]() ![]() Post weld heat treatment is a controlled process that has to be done properly if the desired results are to be obtained. I disagree to some extent with what has been stated.
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