By -
Date 03-19-2005 14:18
Good Morning,
Maybe I'm missing something here. It's happened before. <smile> I'm saying that if the author used CO2 as his shielding, he can use either the -1 or -4 FCW designation. The classification test for the -1 designation was done using straight CO2, while the classification test for the -4 was done using 75-80%Ar/remainder CO2. If his tests were done using a -1 FCW and CO2 as his shielding, he does not have to requalify if he uses the same CO2 and starts using a -4 FCW designation. I base my opinion on ANSI/AWS A5.22-95, Table 2, Note (c), and also Table 3 that lists E308LTX-1 and 308LTX-4 as Dual Classified Electrodes. In Sec. IX, QW255, (QW-404, Filler Metals) the change from a -1 to a -4 is not an essential variable. Unless I'm mistaken, which is very likely, the only time a requalification is required is if he changes from one gas shielding (CO2) to an Ar/CO2 mixture.