Combined welding process ( GMAW + FCAW) . WPS 6GR Qualification

[Lolospit]

Hello EveryBody

I`m wrttting a WPS & PQR according to AWS d1.1: I have a doubt

Material : A36.
Position: 6GR
Diameter: 6" sch.120.
Process : Gmaw + Fcaw ( Gmaw, thickness of weld root 3/16 " +tthe rest of weld with Fcaw for fill and Cap)

I think that diameter Range fot either ( Fcaw + Gmaw) over 4"

But My doubt is the thickness range

Gmaw+Fcaw ( conbined process over 3/16" according to Tabe 4.2 AWs d1.1
But for single process GMAW ( the thikness rage is 1/8" to 3/8"( 2T) or over 3/16")
& for single process FCAW ( the thikness rage is 1/8" to 3/4"( 2T) or over 3/16")

Can you help me?. Thankssss, Sorry for mi English.

 

[gtaw]

I do not believe A36 is available as pipe. Check again, you most likely have ASTM A53 or ASTM A106 pipe.

If you are welding butt joints there is no reason to weld the 6GR, you can weld a 6G. The "R" stands for restricted access which is required when qualifying a WPS or a welder for welding T, Y, or K joints without backing. If that is the case, the upper and lower pipe sections must differ in wall thickness by at least 3/16 inch.

AWS D1.1 is set up to weld the entire test coupon with a single welding process. Unlike ASME Section IX, the range of joint thickness is based on the thickness of the test coupon, not the thickness of the weld deposit. If you want to make production welds using more than one welding process, each welding process must be qualified separately. You can combine the welding processes in the WPS for production work.


Best regards - Al