Welder Red Seal · Question
What is the primary purpose of a post-weld heat treatment (PWHT), also known as stress relieving?
PWHT involves heating a completed weldment to a specific temperature below its critical transformation temperature and holding it for a set time. This process a
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Question: What is the primary purpose of a post-weld heat treatment (PWHT), also known as stress relieving?
Answer options:
- To increase the hardness and tensile strength of the weld metal.
- To inspect the weld for subsurface discontinuities using thermal imaging. ✅ To reduce residual stresses and improve ductility and toughness.
- To clean the weld surface and remove slag and spatter.
Correct answer: To reduce residual stresses and improve ductility and toughness.
Explanation: PWHT involves heating a completed weldment to a specific temperature below its critical transformation temperature and holding it for a set time. This process allows the internal, locked-in stresses from welding to relax and be redistributed, which improves the weldment's resistance to brittle fracture and improves toughness.
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