As its time to do our testing for D1.5 Fracture Critical WPSs, I was wondering what happened to the shielding gas Essential variable listed in Table 5.3 (1995 Edition) that states a change from a single gas to a gas mix requires re-qualification. The 2002 Edition has changed without any note or indication that this requirement has been moved or eliminated all together. I have searched through Section 4, 5, and 12 without finding any reference to the change or elimination. I am looking for clarification that a PQR ran to AWS D1.5 2002 using 100% Co2 will qualify a gas mix on the WPS of 75%/25% Argon / Co2. Any one out there have some advice?
See Table 5.1 and para 5.5.1.
My interpretation is that you cannot qualify a WPS that uses 75%Argon/25% CO2 with PQR tests run with 100% CO2, or vice versa. 100% CO2 versus 25% CO2 is greater than a 25% change. You would have to run separate tests with each gas.
Look at table AWS D1.5 2002 Table 5.1-consumables.
Looks like changing from a single gas to a mixture requires WPS requalification.
Hope this helps,
brande
That's a change in essential variable.
By MErboe
Date 01-16-2007 22:27
I missed that one, thanks a lot!!
