Understanding API ICP653 Reading 15-Worksheet-11a
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QW-200.4 Combination of Welding Procedures<br />
(a) More than one WPS having different essential, supplementary essential,<br />
or nonessential variables may be used in a single production joint. Each WPS<br />
may include one or a combination of processes, filler metals, or other<br />
variables. Where more than one WPS specifying different processes, filler<br />
metals, or other essential or supplementary essential variables is used in a<br />
joint, QW-451 shall be used to determine the range of base metal thickness<br />
and maximum weld metal thickness qualified for each process, filler metal, or<br />
set of variables, and those limits shall be observed. Alternatively, qualification<br />
of WPSs for root deposits only may be made in accordance with QW-200.4(b).<br />
When following a WPS that has more than one welding process, filler metal,<br />
or set of variables, each process, filler metal, or set of variables may be used<br />
individually or in different combinations, provided<br />
Charlie Chong/ Fion Zhang
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