Dear sirs,
As you know: P-No. is an essential variable during welder qualification testing. Below is the text and table from ASME IX 2010.
QW-403.18: A change from one P-Number to any other P-Number or to a base metal not listed in table QW/QB-422, except as permitted in QW-423, and in QW-420.
QW-423.1 Base metal used for welder qualification may be substituted for the metal specified in the WPS in accordance with the following table. 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
"....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...", this sentence puzzles me. Can someone tell me how to understand QW-423.1?
Thanks!
If you were to perform a qualification test using a P-No. 1 test coupon, then you would look in the left column to find the row that contains P-No. 1. Then read the same row in the right column to see what other base metals the welder is qualified to weld. In this case a welder qualified with P-No. 1 is qualified to weld P-No. 1 through P-No. 15F, P-No. 34, and P-No. 41 through P-No. 49 base metals. However, F-No. is also an essential variable, so if the test was welded with an F-No. 4 electrode the welder would only be qualified to weld those P-Nos. that can be welded using an F-No. 4 electrode.
Thank you!
Yes, F-No. is an essential variable for WPQ, it is a reminder for me that F-No. will limit the base metal qualified for welders indirectly. Right?
When I was confronted with this question my mentor recommended that I think of it as a chart and in my copy sect IX he drew lines for better clarity.
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
_____________________________________________________________
Regards Donnie Mann
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