[MW:31857] PWHT required after Preheat for CS or LTCS

Dear Experts,

Hope you all are well.

I have a question is about the weld of the base material of CS (or Low temp. CS) with wall thickness greater than 25mm, Do we still required PWHT if we applied a preheating process before, or PWHT is no longer mandatory?

And which reference can be found?

Thank you & best regards./.

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