// CODE SNIPPET
1309.5.2 Welder Qualification Procedure
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The
GTAW autogenous orbital procedure and the welder
qualification procedure shall be qualified in accordance
with Section IX of the ASME Boiler and Pressure
Vessel Code. Welder qualification procedures shall
include a bend test and a tensile test in accordance with
Section IX of the ASME Boiler and Pressure Vessel
Code on each tube size diameter. [NFPA 99:5.1.10.5.1.2,
5.1.10.5.1.3]
GTAW autogenous
orbital welded joints shall be purged during
welding with a commercially available mixture of
75 percent helium (+/- 5 percent) and 25 percent
argon (+/- 5 percent). [NFPA 99:5.1.10.5.1.5]
Test coupons shall be
welded and inspected, as a minimum, at the start of
work and every 4 hours thereafter, or where the
machine is idle for more than 30 minutes, and at the
end of the work period. Test coupons shall be
inspected on the I.D. and O.D. by a qualified quality
control inspector, and shall be welded at change of
operator, weld head, welding power supply, or gas
source. [NFPA 99:5.1.10.5.1.7 - 5.1.10.5.1.9]
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Welders shall be qualified in
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