ASME Weld Procedure using non-asme material
ASME Weld Procedure using non-asme material
(OP)
I have an application where I need to weld 310SS to a 35/45 Cr Ni+Nb microalloy, the latter of which is not an ASME material. I'm working to create a WPS, and every WPS I've worked on before was for ASME base materials.
In this case, the 35/45 Cr Ni+Nb microalloy is not expected to bend when subjected to the bend test. How should this situation be dealt with? A WPS is required by our customer, but I don't know how to evaluate the test coupons.
In this case, the 35/45 Cr Ni+Nb microalloy is not expected to bend when subjected to the bend test. How should this situation be dealt with? A WPS is required by our customer, but I don't know how to evaluate the test coupons.





RE: ASME Weld Procedure using non-asme material
RE: ASME Weld Procedure using non-asme material
RE: ASME Weld Procedure using non-asme material
For your application, since you are not using a construction code, you as the designer can elect to qualify a WPS using Section IX with the proviso that in lieu of bend testing because of anticapted low ductility, you are using a cross section to evaluate weld quality. You can still run tensile testing to determine the strength of the groove weld.
RE: ASME Weld Procedure using non-asme material
RE: ASME Weld Procedure using non-asme material
What books or other resources would best get me more competent in this regard? I've had no welding education or training.
RE: ASME Weld Procedure using non-asme material
https://www.amazon.com/CASTI-Guidebook-ASME-Sectio...
Also, the American Welding Society provides various reference books on the topic of welding procedures.
RE: ASME Weld Procedure using non-asme material
But please note with Addenda 2008 a footnote (e) was added to table of QW-466.1. Actual this footnote is now general note (d):
"For materials with less than 3% elongation, a macro‐etch specimen shall be used in lieu of bend test at each bend test location. Acceptance criteria shall be in accordance with QW-183(a)"
So if 35/45 Cr Ni+Nb microalloy has a elongation less than 3% you may perform 2 tensile test specimen and 4 macro-etch specimen.
But the use of specimen as required for hard facing weld overlay for test of a butt weld as recommended by metengr is a code violation.
Regards - Juergen
RE: ASME Weld Procedure using non-asme material
Thanks for pointing this section out to me.
RE: ASME Weld Procedure using non-asme material
You misread what I stated above.
In this situation you can do a destructive examination versus tensile and bend tests using a cross section of a weld coupon to evaluate weld quality. No different than an ASME Section IX hardfacing weld overlay procedure qualification.
Perhaps I could have stated it differently, but a cross section of a weld and evaluating weld quality is a macroetch. This is similar to evaluating hardfacing as well, that was the concept.
RE: ASME Weld Procedure using non-asme material
This alloy is relatively a new alloy for ethylene environment. European practice is to go for welding products of matching chemistry. Around 4% elongation is usually achievable for welding of similar alloys of 35/45 Nb chemistry.
You may get slightly more elongation due to dilution effects while welding 310SS to 35/45 Nb.
The following data sheet may provide you some guidelines. https://www.rapidwelding.com/files/T3545NB-X.pdf.
Thanks.
Pradip Goswami,P.Eng.IWE
Welding & Metallurgical Specialist
ca.linkedin.com/pub/pradip-goswami/5/985/299
RE: ASME Weld Procedure using non-asme material
RE: ASME Weld Procedure using non-asme material
RE: ASME Weld Procedure using non-asme material