Welder Red Seal · Question
What is the purpose of post-weld heat treatment (PWHT)?
PWHT is applied after welding to reduce or redistribute residual stresses, modify the microstructure of the weld and HAZ, and improve ductility and toughness, t
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Question: What is the purpose of post-weld heat treatment (PWHT)?
Answer options: ✅ To relieve residual stresses and improve toughness
- To harden the weld metal for increased strength
- To prevent hydrogen embrittlement during welding
- To improve surface finish and appearance
Correct answer: To relieve residual stresses and improve toughness
Explanation: PWHT is applied after welding to reduce or redistribute residual stresses, modify the microstructure of the weld and HAZ, and improve ductility and toughness, thereby reducing the risk of brittle fracture.
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