Welding procedure qualification
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6.1.5.2 in 47014-2011: If the test piece undergoes post-weld heat treatment at a temperature higher than the upper transformation temperature, or if austenitic materials are subjected to solution treatment after welding, the procedures specified in Table 7 or Table 8 shall still be followed. There is a test piece made of S30408 with a thickness of 8 mm; the post-welding test piece has not been subjected to solution treatment. For this test piece, what should be the effective base metal thickness range? Should it be 8–16 mm as specified in 6.1.5.2, or 1.5–16 mm as specified in Table 7?
Check whether the weld evaluation you have specifies any impact test requirements; if so, it is 8-16, and if not, it is 1.5-16