Question regarding the sequence of heat treatment and flaw detection
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Personally, I feel that weld joints prone to welding heat cracks and those with high corrosion resistance should be heat-treated after inspection, while weld joints prone to cold cracks and reheat cracks should be heat-treated before inspection. I’m not sure if this is correct; the relevant standards do have requirements on this matter. Please, experts, explain it to me
What they said makes sense. It is better to conduct flaw detection after heat treatment. After heat treatment, it undergoes thermal and cold tests; if no defects are found during inspection, then there’s no problem.
Stainless steel and nickel alloys are prone to weld heat cracks and are usually not heat-treated. Stabilized stainless steel requires heat treatment, and flaw detection is also carried out after heat treatment. Low-alloy high-strength steels are prone to cold cracks and reheat cracks, which requires heat treatment to be carried out immediately after welding, leaving no time for flaw detection; for those prone to delayed cracking, flaw detection is allowed only 24 hours after heat treatment.