asme ix QW-410.9 in multiprocess
asme ix QW-410.9 in multiprocess
(OP)
Hello,
I have qualified a PQR (P8 and T=10 mm) welded by GTAW (3 mm deposited by one pass) and SMAW (7 mm by 3 passes) process with CVN requirements. Then, it is possible to weld a test coupon of 3 mm by one pass only with GTAW process?
I mean, the QW-410.9 Multi to single pass/side take into account a pass by each technique or the total passes made by different techniques?.
Thanks in advanced
I have qualified a PQR (P8 and T=10 mm) welded by GTAW (3 mm deposited by one pass) and SMAW (7 mm by 3 passes) process with CVN requirements. Then, it is possible to weld a test coupon of 3 mm by one pass only with GTAW process?
I mean, the QW-410.9 Multi to single pass/side take into account a pass by each technique or the total passes made by different techniques?.
Thanks in advanced





RE: asme ix QW-410.9 in multiprocess
One thing to keep in mind is your minimum qualified thickness, per QW-403.6. Because you have qualified with impact testing, your minimum allowed base metal thickness (T) is 10mm as per your PQR, so you really can't weld on a T = 3mm unless you are doing a separate PQR.
Technically QW-410.9 is applicable in your situation. However, I know that the purpose of multiple pass is the tempering effect of stacking weld beads (i.e. top weld bead tempers the weld bead below it as it is being deposited). And as this is a P-No. 8, perhaps someone with a little more knowledge of tempering those applicable in that P-No. group can chime in.
RE: asme ix QW-410.9 in multiprocess
I have qualified a PQR (P8 and T=5,5 mm) welded by GTAW (t=4 mm deposited by TWO pass) and SMAW (t=1,5 mm by one pass) with CVN requirements. Then:
- It is possible to weld a test coupon of 3 mm by one pass only with SMAW process?
- QW-410.9 must be applied in case of each welding process or "multiple pass per side" includes GTAW pass and SMAW pass processes.
RE: asme ix QW-410.9 in multiprocess
When you mention "test coupon" what do you mean? Are you doing another separate PQR?
Includes GTAW pass and SMAW pass processes.
RE: asme ix QW-410.9 in multiprocess
Therefore, you are saying that multipass per side is independ of the welding technique used during PQR qualification. I thought that the esential/suplementary variables apply for each technique.
Thanks
RE: asme ix QW-410.9 in multiprocess
Yes. Your PQR is considered multiple pass, no matter how many different welding processes you used.
That is also true, but this supplementary variable applies to both welding processes in the same manner.