SC Pressure And Process Piping Practice Questions - South Carolina Pressure And Process Piping Contractor Examination Exam

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What is the principal reason a WPS may require postweld heat treatment (PWHT) on chrome-moly or thick carbon-steel pipe welds?

To paint the weld so it matches the adjacent insulation jacket To reduce residual stress and soften hard heat-affected zones so the joint meets toughness and hardness limits To replace hydrostatic testing on every B31.3 system To convert stainless steel to carbon steel

Correct Answer:

To reduce residual stress and soften hard heat-affected zones so the joint meets toughness and hardness limits

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