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ASME IX QW-423.1 QUESTION

ASME IX QW-423.1 QUESTION

ASME IX QW-423.1 QUESTION

(OP)
Hello,

what is the range of approval for a welder he tested in pipe with P-No. 1 to 1??

I think interpreting ASME IX, QW-423.1 following:
1 through 11, 34, 41 through 49.

Is that correct???
Can he welds, for example, P47?

Thank you

RE: ASME IX QW-423.1 QUESTION

"Is that correct???Can he welds, for example, P47?"

Yes, and Yes.

RE: ASME IX QW-423.1 QUESTION

(OP)
Thank you very much.

But, is that reason? I mean, is it the same difficulty, if a welder weld carbon steel and stainless steel?

distinction elsewhere in the asme code?

Thank you again

RE: ASME IX QW-423.1 QUESTION

inspectorGR,
Keep in mind this is only one variable - base metals.  Filler metals is another separate variable that must be considered.
A welder who qualified on carbon steel ( P1) using F6 would be qualified to weld stainless ( P8 with F6), but, also bear in mind that these are minimum Code requirements.  
P4x would require separate qualification using F4x filler.  

RE: ASME IX QW-423.1 QUESTION

Though your answer is yes and yes,

Note that your welder is qualified for P-No. 1 through 15F, 34, and 41 through 49.

 

RE: ASME IX QW-423.1 QUESTION

Mathguy is correct, meets ASME IX.  However, in the 'Real World', P8 [stainless] to P8 is actually harder than P1 to P1.  And P4x [inconels, etc.] to P4x is enormously harder.  If your welders are using a P1-P1 qual on these other materials, X-ray the first few welds of each guy.  Try to get UT ultrasound brought in for any P4x welds.  Inconels are very likly to have side-wall Lack-of-Fusion so 'tight' that X-ray will not image it.  

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