tonnesen
Mechanical
- Jan 30, 2012
- 10
I have a question concerning QW-407.2, when I qualify a WPS according to ASME Section IX with impact tests and PWHT this variable becomes essencial, so my question is if my coupon for the PQR is 25 mm and the PWHT is 1 hr, the range of thickness qualified is from 16 to 50 mm.
Now suppose that in production weld I have thickness of 50 mm being welded, the PWHT required will be 2 hr, but my PQR was qualified only with 1 hr, so my question is, when qualifying a PQR should I use the time range for the greatest thickness in the range or I will qualify the time per thickness rate?
If the situation was coupon 25 mm thickness, with impact tests and PWHT used in the qualification was 2 hr, in the production weld could I use PWHT of only 1 hour? No, right?
Now suppose that in production weld I have thickness of 50 mm being welded, the PWHT required will be 2 hr, but my PQR was qualified only with 1 hr, so my question is, when qualifying a PQR should I use the time range for the greatest thickness in the range or I will qualify the time per thickness rate?
If the situation was coupon 25 mm thickness, with impact tests and PWHT used in the qualification was 2 hr, in the production weld could I use PWHT of only 1 hour? No, right?