Welder Red Seal · Question
Post-weld heat treatment (PWHT) in the form of stress relieving is applied to a welded fabrication. What is its main purpose?
Welding creates significant internal stresses as the metal heats and cools. Stress-relief PWHT involves heating the fabrication to a specific temperature below
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Question: Post-weld heat treatment (PWHT) in the form of stress relieving is applied to a welded fabrication. What is its main purpose?
Answer options:
- To normalize the grain structure of the base metal.
- To increase the hardness and tensile strength of the weld. ✅ To reduce the high residual stresses introduced by welding.
- To clean the surface of the weld and remove slag.
Correct answer: To reduce the high residual stresses introduced by welding.
Explanation: Welding creates significant internal stresses as the metal heats and cools. Stress-relief PWHT involves heating the fabrication to a specific temperature below the transformation range to allow these stresses to relax, reducing the risk of brittle fracture and improving dimensional stability.
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