Material for welder and wps qualification
Material for welder and wps qualification
(OP)
have a question I can use a material API 5L gr B to qualify welders and welding procedure, and then I would serve for materials used in production API 5L grade X70, as they have the same p No. but different tensile strength,





RE: Material for welder and wps qualification
1. You can qualify welders on Grade B and weld X70 for production.
2. If supplementary essential variables DO NOT APPLY, you an use the Grade B WPS to weld API 5LX 70.
If supplementary essential variable DO APPLY, you cannot use the Grade B WPS (P1 Group 1) to weld API 5LX 70(P1 Group 3) as a change in material group is a supplementary essential variable . See ASME IX QW-403.5.
If using API 1104, welders qualified on grade B can weld X70 (within other retrictions shown in Section 6). Again, for API 1104, a WPS qualified on Grade B is not acceptable to use to weld X70.
RE: Material for welder and wps qualification