ethan18
Mechanical
- Nov 20, 2023
- 31
Hello, if someone has relevant experience with Section III NB, please help with the following issue:
NB 2431.1(c) specifies that the preheat, inter-pass, and PWHT temperatures to be adopted for preparation of test coupon for Lot Qualification of welding material are required to be same as the production welds.
Supposing that an electrode, say E7018-1 electrode, is used for production welding with in following four conditions:
i) without preheat, without PWHT;
ii) without preheat, with PWHT;
iii) with preheat, without PWHT; and
iv) with preheat, with PWHT.
In order to comply with NB 2431.1(c), is it required to prepare four separate test coupons with preheat and PWHT combinations as described above? There are two interpretations, III-1-83-202, III-1-77-64, which address the subject; but don't quite clinch the issue for me.
Does anyone have any thoughts on this?
NB 2431.1(c) specifies that the preheat, inter-pass, and PWHT temperatures to be adopted for preparation of test coupon for Lot Qualification of welding material are required to be same as the production welds.
Supposing that an electrode, say E7018-1 electrode, is used for production welding with in following four conditions:
i) without preheat, without PWHT;
ii) without preheat, with PWHT;
iii) with preheat, without PWHT; and
iv) with preheat, with PWHT.
In order to comply with NB 2431.1(c), is it required to prepare four separate test coupons with preheat and PWHT combinations as described above? There are two interpretations, III-1-83-202, III-1-77-64, which address the subject; but don't quite clinch the issue for me.
Does anyone have any thoughts on this?
