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To what code are you using for qualification?
Better yet, to what code are the qualifications the welder's already have? Are we talking only one code, or are you talking about qualifications to two different codes that the welder's are qualified to? When you wrote that you already have a qualified WPS's for Carbon to Stainless that your welders will be welding to, what code was the WPS qualified to?
Respectfully,
Henry