American Welding Society Forum
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.
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.
Powered by mwForum 2.29.2 © 1999-2013 Markus Wichitill