last updated by bien 1 month, 2 weeks ago
August 6, 2021 at 11:10 am #13235bienKeymaster
- Qualified 6GR qualify all position, see Figure 9.25 & Figure 9.26
- Min. 2 test coupon qualify material thickness from 3-unlimited, see table 9.10.
- In case of, CVN requirement for welding procedure, above test coupons also complied with Table 4.6 line 2.
Minimum thickness qualified is T or 5/8 in [16 mm] whichever is less, except if T is less than 1/4 in [6 mm], then the minimum thickness qualified is 1/8 in [3 mm].
- Recommend qualify a single process in a test coupon, instead of multiple process in a test coupon. You shall not delete or omission a welding process in a product weld. See Table 4.5 line 34.
The omission, but not inclusion, of backing or back gouging
If a PQR exists which satisfies all requirements except for CVN testing, it shall be
necessary only to prepare an additional test weldment with enough material to provide the required CVN test specimens. See Subclause 4.27.3.