John, I'm sorry I'm having all kinds of technical difficulties becasue I can't send or receive via AOL at work so they never went through, sorry.
I'll just write it here.
Can I ask you to please double check me in my determination that it is ok for me to change from mixed gas duel sheild FCAW to straight CO2 without having to re-do my D1.5 Bridge PQR's and WPS's?
The owner wants to consider changing to straight CO2 to save money.
I Went through and came up with shielding gas "composition" is not an essential variable so I can change to 100% CO2 and not have to re-do my PQR or re-certify my welders.
D1.5 Bridge Code
Table 5.1 pg 100 allows me to change the composition, and I'm going in the direction they talk about so I'm OK.
Section 5.13 Production WPS pg 90, takes me to Table 5.3 pg 101; there it talks about flow rate, not composition.
Section 5.24.2 pg 96 Welder Qual. Variables, again does not mention change in composition of shielding gas.
So I come up with per D1.5 that I can change from a mixed gas to a single gas composition and not have to requal my PQR,WPS's or re-certify my welders.
Would you agree?? I'd like your insight.
Thanks Chris