Significance Of A-Numbers in ASME & AWS
Significance Of A-Numbers in ASME & AWS
(OP)
ASME Section IX QW-404.5 and AWS D1.6 Table 4.6 both discuss or list "A-Numbers" for weld metal analysis. What is the purpose of these A-Numbers? Is it the expected composition of the as-purchased fillers or is it the composition of the diluted weld metal for the entire joint?
My real task is to find out when it may be required by Code to run PQR tests beyond typical bend, tension or CVN if there may be concern about chrome depletion in various grades of 300 and 400 series stainlesses. I know it is always my perogative to run such tests, but strict adherence to Code requirements do not seem to get me there. I am wondering if the A-Number qualification variable is a cloaked requirement for running sensitization tests when qualifying new WPS's for stainless weldments.
Thankyou for advice on this.
My real task is to find out when it may be required by Code to run PQR tests beyond typical bend, tension or CVN if there may be concern about chrome depletion in various grades of 300 and 400 series stainlesses. I know it is always my perogative to run such tests, but strict adherence to Code requirements do not seem to get me there. I am wondering if the A-Number qualification variable is a cloaked requirement for running sensitization tests when qualifying new WPS's for stainless weldments.
Thankyou for advice on this.





RE: Significance Of A-Numbers in ASME & AWS
RE: Significance Of A-Numbers in ASME & AWS
RE: Significance Of A-Numbers in ASME & AWS
If the Codes do not drive you toward a sensitization test on SS welds, how do you know you have the WPS right? Isn't it possible to keep your interpass temps within whatever may be recommended but still cause chrome depletion in and around the HAZ? And still pass bends and tensiles?
RE: Significance Of A-Numbers in ASME & AWS
Regarding selection of filler metal and base metals for a WPS, that is still left up to the organization that is qualifying the procedure. Section IX only provides guidance for what is necessary to assure adequate ductility and strength in service. Specific details regarding filler metal selection and behavior are up to the Engineer to figure out in service.
RE: Significance Of A-Numbers in ASME & AWS