but you have to notice that you still have the F no is essential variable which is the most important variable in welder qualification.
so if you weld a P no 1 plate you can weld P-No. 1 through P-No. 15F,P-No. 34, and P-No. 41 through P-No. 49 but you have to consider the filler metal F no.
an examble, if you used ASTM A36 which is P no 1 in welder qualification using E7018 electrode which is F no 4 the welder is not qualified to weld ASTM A240. grade 304L which is p no 8 using E308L electrode which is F no 5.
but if the you used ASTM A36 which is P no 1 in welder qualification using E71T1(FCAW wire) which is F no 6 the welder is qualified to weld ASTM A240. grade 304L which is p no 8 using ER308L (FCAW wire) which is also F no 6.
________________________________________
من: materials-welding@googlegroups.com [materials-welding@googlegroups.com] بالنيابة عن PRAMOD KARAPPAKUTTY [pramodvkmly@gmail.com]
تاريخ الإرسال: 14 فبراير, 2012 12:10 م
To: materials-welding@googlegroups.com
الموضوع: [MW:13680] Clarification on QW-423.1
Dear Experts,
I expect your valuable advice.
As per ASME Sec IX, QW-423.1 It has been detailed that "When a base metal shown in the left column is
used for welder qualification, the welder is qualified to weld all combinations of base metals shown in
the right column, including unassigned metals of similar chemical composition to these metals."
Base Metals for Welder Qualified Production
Qualification Base Metals
P-No. 1 through P-No. 15F, P-No. 1 through P-No. 15F,
P-No. 34, and P-No. 41 P-No. 34, and P-No. 41
through P-No. 49 through P-No. 49
P-No. 21 through P-No. 26 P-No. 21 through P-No. 26
P-No. 51 through P-No. 53 or P-No. 51 through P-No. 53 and
P-No. 61 and P-No. 62 P-No. 61 and P-No. 62
This has been explained in latest edition (2010), still I have some doubts. As we know 'P' number is essential variable, one welder qualified for one 'P' number cannot weld other 'P' material. But this above mentioned instruction gives some confusion regarding this matter. So anybody can please explain to clarify my doubt.
Thanking You,
Pramod.
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