Welding process
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On page 36 of NB47014-2011, item b in 6.1.2.2 is a bit unclear. Can the welding procedure qualification for S31603 phase welding be used for S30403 phase welding? But if even the welding electrodes have changed, how can they still use the same welding process? Solve! Thank you!
It should be possible; what’s stated here are the technical standards, which means that both can likely be evaluated using unified standards!
Your title is too general. In my opinion, if 316 meets the qualification standards, then welding materials made of 316 can be used to weld 304; however, if 304 material is used for welding, re-evaluation is necessary
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If 316 passes the evaluation, welding 304 using 304 welding materials does not require a new welding procedure evaluation. Because they are materials of the same category and group. If the base material is changed, the welding material must also be changed. If you insist on carrying out the welding process evaluation, no one will stop you. But the boss will be worried about losing his money.
The filler metal must also meet certain requirements regarding category, etc.; for details, see 6.1.3. Additionally, the welding method, post-weld heat treatment, and thickness of the welded parts must all satisfy the corresponding requirements.
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316 has been evaluated; 304 will suffice, so there’s no problem. Classifying the base metal and welding materials is done to reduce the number of evaluations, right?
Of course. Since both the group number and the filler metal have changed, and heat treatment is not used either, then with the welding method remaining unchanged, it is certainly possible to apply the welding methods applicable to S30403; in that case, the A002 electrode corresponding to S30403 should be used.