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Post-weld heat treatment (PWHT) is typically required for ASTM A216 WCB (cast carbon steel) materials when they are welded, particularly for thicker sections or when they are used in high-stress applications. PWHT helps relieve residual stresses and improve the toughness of the weld and heat-affected zone. However, the necessity for PWHT can also depend on specific design codes, service conditions, and the thickness of the components being welded. It's important to consult relevant industry standards and specifications for guidance on specific applications.

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