Process qualification coverage issues
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According to NB/T47014-2011......when an impact test is specified, after the welding procedure qualification is successful, if T≥6mm, the minimum effective range applicable to the thickness of the base material of the welded part is the smaller of the test piece thickness T and 16mm； When T＜6mm, the minimum effective range applicable to the thickness of the base metal of the welded part is T/2. Question: For Fe-1-2 grade base material in the form of 4mm thick steel plates (or steel pipes), 5mm impact specimens cannot be used. In this case, what is the minimum valid range for the thickness of the weldment base material: 2mm or 4mm?
When T＜6mm, the minimum effective range applicable to the thickness of the base metal of the welded part is T/2. It should be 2mm
When T＜6mm, the minimum effective range applicable to the thickness of the base metal of the welded part is T/2. It should be 2mm
The Fe-1-2 material requires impact testing, but I can’t conduct (or haven’t conducted) the impact test! Can we also use T/2?
1. When an impact test is specified, and after the welding procedure qualification is successful, when T<6mm, the minimum effective range applicable to the thickness of the base material of the welded part is T/2. The prerequisite is that when impact is required, it is T/2. (The rated thickness is T/2). II. When no impact test is conducted, according to Tables 7, 8, 9, and 10 of NB/T47014, the thickness range is selected: the effective range for the base metal thickness of the specimen is 1.5~8 mm, and the thickness range for the weld metal is 0~8 mm
If the impact test cannot be conducted, the impact test is waived. . However, the coverage area is based on the impact range. . Although here, there are cases where the coverage area with impact is slightly wider than that without impact. . But that’s the principle
.......But the coverage area is based on the impact range........Is there a source for this statement? Where can I find it?
Sections 6.1.5.2 and Table 7 in NB/T47014 should be considered together, with attention also paid to Table 10.
When it is specified that an impact test shall be conducted, this is a prerequisite, that is, according to the impact range. . . . . .