Suppose, if we change the base metal from an existing qualified WPS and if the new base metal falls in the same ‘P’ number then the requalification of the existing WPS is not required, it means no need for a new PQR.īut this doesn’t mean that one can easily substitute the base material, from existing WPS, of same ‘P’ number at any time. Though all materials of the same ‘P’ number don’t exhibit the same properties, but after considering the above-mentioned parameters, ASME has done this logical grouping. This grouping of base metals has been done on the basis of the following parameters Hence, to reduce these costly and time-consuming activities, ASME has done groupings of base metals and has assigned certain P numbers to each group of metals. sending it to a lab for destructive test.Conducting a procedure qualification requires a lot of time and money due to the following procedural requirements The main purpose of assigning this number system is to reduce the number of procedure qualification records (PQR). These numbers can be found in ASME BPVC Section IX, please see Table–1 for details Table – 1

ASME Boiler and pressure vessel code (BPVC) has assigned certain numbers to base metals (to be welded) as well as to filler metals (electrodes).įor base metals, ASME has assigned two number system, these are įor filler metals, the number system which is assigned, are as follows

Asme bpvc section ix torrent