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

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