ASME QW-423.1 unassigned metals
ASME QW-423.1 unassigned metals
(OP)
ASME QW-423.1 permits welder qualifications to extend to unassigned base metals of similar chemical composition to base metals that have P-numbers. Does anyone have any experience in how "similar" a base metal's chemical composition has to be?





RE: ASME QW-423.1 unassigned metals
The easy answer to this question is obtain the following publication from AWS
AWS B2.1 2009 Specification for Welding Procedure and Performance Qualification. There is a list of M-No's for a wide range of material specifications. Very useful for non-ASME materials.
RE: ASME QW-423.1 unassigned metals
RE: ASME QW-423.1 unassigned metals
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Also, why do you need to have a P-No designation for this material? It is not code approved for pressure boundary application (it is for bolting), so you can qualify a WPS using the trade name for base material designation or qualify as ASTM B 670 UNS N07718.
RE: ASME QW-423.1 unassigned metals
RE: ASME QW-423.1 unassigned metals
RE: ASME QW-423.1 unassigned metals
RE: ASME QW-423.1 unassigned metals
The AWS document I described above captures the essence of assigning material group numbers, see below
I can't think of a better explanation. If you do not understand the above, you need to consult with a welding or materials engineer.
RE: ASME QW-423.1 unassigned metals
RE: ASME QW-423.1 unassigned metals
No problem. I actually did understand your question. I was trying to find an explanation from reference material. I have treated unassigned material similar to a P-No material based on what I felt were composition and mechanical properties being as close to the material with an actual P-No. The problem is you need to know the material properties and how it responds to welding it decide if it should be treated similar to a P-No. This is a subjective call and should be done by a materials or welding engineer. Bye.