After initial qualification, a welder who works on service lines ____ inches or smaller may not weld unless within the preceding 7.5 calendar months or twice each calendar year at least 2 sample welds are tested and acceptable per app. C sec lll CFR-49

After initial qualification, a welder who works on service lines ____ inches or smaller may not weld unless within the preceding 7.5 calendar months or twice each calendar year at least 2 sample welds are tested and acceptable per app. C sec lll CFR-49