[MW:28782] Aws D1.1

Hi all,
I have few questions regarding AWS D1.1.

1. If a welder qualifies on 3G and 4F
He is qualified for all positions on fillet welds.

Is he qualify on pipe fillet weld? What Diameter limits he can weld on fillet.

2. If a welder qualifies the welding process FCAW using mix gas (80%Ar +20%CO2)
Can he weld FCAW process using 100% CO2?

Please suggest ...


Best Regards,
Chandra

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