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Up Topic Welding Industry / ASME Codes / ASME SEC IX QW 403.5
- - By Nandesh Kumar (*) Date 11-30-2009 11:14

In our piping project, we are planning to weld P1, Group 1 to P1 , Group 2 and Vice versa ( in any combination as per QW 403.5). The project requires impact test and we are fulfilling the requirement. Is it possible to weld in such combinations? If YES, QW 253 and QW 256 says (SMAW and GTAW ) in their table that change in group  number is a " supplementary essential variable " Any inputs will be helpful.

Thanks in advance.
Parent - By MBSims (****) Date 12-01-2009 02:35
It is not only possible, but quite common to weld these combinations of materials.  If you qualify the WPS by welding a P-No. 1 Group 1 base metal to a P-No. 1 Group 2 base metal and performing the required impact and other tests, you would be qualified to weld  any combination of P-No. 1 Groups 1 or 2 to each other or to themselves.  This is stated in QW-403.5.  The supplementary essential variables must be followed when notch toughness testing (drop-weight or Charpy v-notch) requirements apply in the applicable code section (Section III, VIII, XI, etc.) or design specification.
Up Topic Welding Industry / ASME Codes / ASME SEC IX QW 403.5

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