Weld overlay process qualification
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I have some questions to ask the more experienced colleagues: 1: Is the thickness covered by the weld metal in the surfacing layer determined according to Table 7 of NB/T47014 (for example, if the thickness of the surfacing layer is δ6, it can cover up to 12)? 2: C.2.2 in Appendix C of NB/T47017 can be understood as the butt welding of composite plates; there must be a process evaluation for the welding thickness of the base layer, ensuring that it covers the thickness of the base layer itself. Additionally, there must be a process evaluation for the butt welding of the overlay layer, with the metal thickness of the overlay layer being sufficient to cover the thickness of the filler metal used in that welding
The surfacing layer is 6 mm thick; it can extend up to 12 mm on the upper side and up to 3 mm on the lower side. The coverage of the base layer is as specified in Table 7