WPS qualified with GMAW-S and GMAW-P
WPS qualified with GMAW-S and GMAW-P
(OP)
I am reviewing a welding procedure that was qualified using a 0.28 in. thick test plate and was welded with short-circuit GMAW for 1/8 in. and pulse GMAW for the remainder of the thickness. In the WPS, is the base metal thickness qualified restricted by QW-403.10 or is QW-451.1 required to be followed?





RE: WPS qualified with GMAW-S and GMAW-P
RE: WPS qualified with GMAW-S and GMAW-P
You may also write on the WPS, two base metal thickness tanges, one for GMAW-S and second for GMAW-P. For GMAW-P, use Table QW-451.1.
Similarrly treat with weld metal deposited qualified thickness range for GMAW-S that is 1.1*1/8 = 0.1375 inches (see QW-404.32), and for GMAW-P see Table QW-451.1
Nasir
Welding Engineer
DESCON ENGINEERING LIMITED
PAKISTAN
RE: WPS qualified with GMAW-S and GMAW-P
Qualified thickness for GMAW-S = .1375"
Qualified thickness for GMAW-P = .310"
One maximum base metal thickness is all that is required.
RE: WPS qualified with GMAW-S and GMAW-P
you cannot increase the production base metal thickness beyond 1.1 times the test coupon thickness when PQR test coupon thickness less than or equat to half of an inch is welded by GMAW-S, then how the qualified base metal thickness is 0.4475" ?
Nasir
Welding Engineer
DESCON ENGINEERING LIMITED
PAKISTAN
RE: WPS qualified with GMAW-S and GMAW-P
I agree with you regarding the thickness qualified but not sure I agree with having two ranges on one WPS.
0.28" = 7.11 mm
1/8" = 3.1 mm (GMAW-S) so remainder (GMAW-P) is 4.0 mm
2 x t for the GMAW-P on it's own = 8.0 mm
2 x t for GMAW-S/GMAW-P in combination = 7.82 mm
IMHO, Not much to be gained other than significant confusion if two ranges are listed on one WPS.
Just out of interest, is the GMAW-S considered as "backing" for the GMAW-P ?
Cheers,
DD