process pipe qualification range

[bhart192]

help to settle dispute: we have a upcoming project , welding alloy 20 P-45 to carbon steel P1 nozzle , contractor has a WPS for p45 to p45 ,I interpret ASME IX 2015 para 432.1 as the following: if he has welder qualified to his P45 WPS they can perform the above P45-P1 weld by following all parameters in the P45 WPS ( filler metal ,gas etc) with no additional qualification test , some think we need to re-qualify a WPS by welding P45-P1 what say you

 

[lslcpfcc]

Dear bro

you must understand the difference between procedure qualification and welder qualification.

i don't find the paragraph 432.1 in ASME ix except the table 432.1 which indicates the F-No. of electrode.

Maybe you means QW423.1

if a welder qualified use an WSP combined with a base metal designed to P-45No， he is qualified to welding the combination of P-No45 and P-No, with other variations of the WPS constant.

 

[DVWE]

lslcpfcc is on the right track; Procedure qualification vs. welder qualification.

If the welder is properly qualified, then according to table QW-423.1, he is qualified to make the dissimilar weld.

However, if your contractor's WPS was qualified for welding P-No. 45 to P-No. 45, then it cannot be used for the dissimilar joint. A P-No. 45 to P-No. 1 WPS is required in this case. See Table QW-424.1

 

[bhart192]

seems these two post don't agree, I understand procedure vs welder quals. QW 423.1 offers a method of using alternative to the mat. used in a WPS and allows for the qualification to extend to the P numbers listed in the right col. as long as all other variables in the WPS are followed . what Im saying is welder is qualified to a P45-P45 wps and took a test using P45-P45 is he not qualified to weld P45-p1 per QW 423.1

 

[ASMEQC]

If the welder took a test using P45 to P45 then he is qualified to weld P45 to P1 per QW423.1. But to make the weld a WPS (weld procedure specification) and PQR (procedure qualification record) for P45 to P1 must be
done. You have to have a WPS and a PQR for the 2 materials welded together. Hope that helps

 

[bhart192]

if as stated if he took a test welding P45-P45 under a WPS established for P45-P45 and as you stated he now qualified t weld P45-P1 , what WPS is he qualified to , if he qualified to the original P45 WPS then he is qualified to weld production P45-P1 welds under that WPS .otherwise I don't see a benefit to alternate base metal for welder test other than cost of materials

 

[DVWE]

bhart,

I think your problem is that you don't know how to ask a question very well or explain what it is that you're seeking an answer for, so let me ask you a few questions.

Tell me exactly what material, weld rod, and welding process the welder qualified with.

Does your contractor have a WPS for welding P-No. 45 to P-No. 1?

 

[Don56]

bhart
Think of it this way. The welder is qualified to a process (GMAW, SMAW etc.) within the constraints of the essential variables. The weld procedure is qualified to the material as grouped by P#'s within the constraints of the essential variables for that process.

 

[bhart192]

then I see no benefit to QW423.1 , why offer a alternative to the base metal specified in the WPS if in you opinion you have to have a WPS for every combination of base metals , just do the combination WPS, why put it in code

 

[david339933]

The benefit is that you don't have to test your welder on every base metal or combination of basemetals he/she welds.

 

[bhart192]

david339933 is right

 

[ASMEQC]

Have a look at QW-403.1

 

[david339933]

QW-403.1 is only applicable to certain processes, such as OFW, ESW, EGW, LBW, EBW. Should look at QW-424.