How can I avoid performing costly qualification test (PQR), by using a proper Welding Procedure Specification (WPS), in first place?
The following are the most common reasons that welding procedure specifications were not getting approval or have been called up for costly qualification testing: -WPS doesn’t comply with the minimum requirements of applicable code -Lack of knowledge on how to prepare and submit a WPS properly in the first place -Not recommending a right shielding gas considering the base materials, thicknesses, weld process and mode of metal transfer (short circuit, spray, globular, pulse) for a WPS -Welding parameters are too high or too low in WPS for that specific application -Don’t know how to take advantage of prequalified welding joints of each welding codes (the AWS D1.1, AWS D1.3, AWS D1.6) Regarding to the last item above, there are still some professionals who are not familiar with all aspects of a weld code; for example, many of the welding tests (PQR) for welding of austenitic stainless steels could be avoided, by using and referring of welding procedure specifications to prequalified weld
