The welding process approved for the base material of group Fe-1-2 is applicable to the base material of group Fe-1-1
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In standard NB/T47014-2023, clause 6.1.2.2 states that the welding processes deemed suitable for base materials of group Fe-1-2 are also applicable to base materials of group Fe-1-1. ”Is it the case that when conducting weld evaluation, only Fe-1-2 requires evaluation, while Fe-1-1 does not need to be evaluated anymore? When welding the base material of Fe-1-1, the welding procedure specification for Fe-1-2 can be used; it is only necessary to select welding materials that are compatible with Fe-1-1 for the welding process. There is no need to redo the assessment. How do the experts understand this clause in the standards?
Yes, according to clause 6.1.2.2 of the NB/T47014-2023 standard, if the welding process for base materials of group Fe-1-2 has been evaluated and found to be satisfactory, then this same welding process is also applicable to base materials of group Fe-1-1. This means that for the Fe-1-1 base material, there is no need to conduct a new welding procedure qualification; the welding procedure already qualified for Fe-1-2 can be used directly, provided that the welding materials used meet the requirements of the Fe-1-1 base material. Therefore, in practical operation, only the welding procedure qualification for Fe-1-2 is required, without the need to repeat this process for Fe-1-1. .
If welding of the base material Fe-1-1 is to use the welding evaluation criteria for Fe-1-2, then welding materials that correspond to those evaluation criteria must also be used
No, see Welding Procedure Qualification for Pressure Equipment 6.1.3.1
If welding of the base material Fe-1-1 is to use the welding evaluation criteria for Fe-1-2, then the welding material must also be one that meets the welding evaluation criteria for Fe-1-2; otherwise, it won’t work
It can be understood that way, but there are many media that cannot be replaced. The drawings showing how to pack these media are usually described in the drawings themselves; however, there are cases where no such description is provided ； These need to be avoided!