Hardness test for welding procedure

Why welding procedure need to survey hardness?

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WPS intends to weld piping production compliance with NACE MR0175.

As mentioned in topic: Preparation of pWPS and running PQR (ASME IX)

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ASME IX is not required hardness test, but you should perform hardness survey to comply with NACE MR0175 part 2 (carbon steel) or part 3 (stainless steel).

Survey location shall detail in each part.
The test specimen may also prepare the same with macro test.

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