Hi

Need your advice whether it is possible to weld A105 or A350 LF to API 5L X65.

According to manufacturer it is impossible due to unequal yield strength as per ASME B31.8 (2003).
However in ASME B31.8 (2003) – Appendix I it is only specified rules for unequal thickness (t1 ≤ 1.5 x t2) and no specify for unequal yield strength.


Thanks
Ben