Issues regarding heat treatment time in weld procedure qualification
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Qualification assessment: Plate thickness of 40 mm; post-weld heat treatment: high-temperature tempering, with a holding time of 4 hours. The actual plate thickness used in construction is now 90 mm, and due to this thickness, the heat treatment time requires 8 hours. Can I use the assessment method mentioned above for this case? According to 6.1.4.2 in 47014-2011, the holding time of the test piece must be no less than 80% of the total holding time experienced by the welded part during manufacturing; therefore this requirement cannot be satisfied. This raises the question: what is then the purpose of the coverage range for the base material listed in Table 7 of 47014?
The actual plate thickness has reached twice the evaluated thickness; it can no longer cover it
It cannot be overlaid; both the plate thickness and the insulation time exceed the limits