Butt Weld for pqr on plate
Butt Weld for pqr on plate
(OP)
I want to run a WPQR for 304L stainless steel.I wondered if I do a double v on plate will that cover him for a butt weld single v .
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Butt Weld for pqr on plate
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RE: Butt Weld for pqr on plate
RE: Butt Weld for pqr on plate
RE: Butt Weld for pqr on plate
If you qualify your welder using a double V-groove, the performance test is considered to be "with backing". Thus, your welder would not be qualified for open root groove welds that require complete joint penetration.
If the welding procedure specification is supported by a PQR that utilized a double V-groove, you could weld grooves with or without backing per the WPS. However, remember that the PQR/WPS does not consider the welder's skill, only the mechanical properties. Thus, a welder that is tested using a double groove or a groove with backing is not qualified for single sided welds where backing is not used.
You must also consider the product form used for the welder performance / qualification test. In most cases, a performance test passed using pipe qualifies the welder for pipe and plate. However, the performance test that utilizes plate does not necessarily qualify the welder for pipe.
Best regards - Al
RE: Butt Weld for pqr on plate