WS D1.1 Structural Steel Welding Code is probably one of the big ones, ASME Section IX, Mil-Std 1595A Flight Hardware (Aviation), Groups IA thru IIIB which include Inconel, all PH Stainless Steels, Stainless Steel, titanium. Aluminum codes would fall under 6061-T6 and 6013. We also have dissimilar metal certs like 17-4PH to 625 Inconnel.

ORT has a CWI on call to test and certify our welders for many special welding processes.