S9074-AR-GIB-010/278
bend testing as described below. Each coupon shall be completed at intervals of not less than 60 days nor greater than 92 days. Visual and color inspection of individual passes and final weld surfaces (inside and outside) shall be performed per the requirements of this document. Any occurrence of unacceptable color except for straw or very light blue shall cause rejection of the coupon. Bend specimens shall be prepared and tested in accordance with MIL-STD-248. Welding of the test coupon shall conform to the following: A. The coupon shall be a full penetration butt joint design of MIL-STD-22 and represent the upper range of thickness welded by the welder in the last three months. or 1/4 inch whichever is less. A backing ring joint design shall not be employed unless the person is only qualified for backing ring joints. For personnel not having butt weld qualifications. an alternate testing method that includes macro and hardness testing can be submitted for NAVSEA approval, or the requirements of this section shall be met. B. The coupon shall be large enough to provide necessary bend specimens (one face and one root bend specimen). C. The coupon shall be welded in the production environment alongside a production weld following the production welding procedure. The same welding equipment, base metal grade, base metal preparation processes, filler material. and inert gas distribution system as used in production welding shall be used for the coupon. Preparation and fit-up of the coupon shall be performed by the same personnel performing these operations for production welds. D. The coupon may be welded in any position. E. Subject to g. below, a welder who uses more than one welding process, may use any one of the processes for which he is qualified to weld the coupon. F. Subject to g. below, the test coupon should be welded using the manual process where the welder used both manual and automatic processes in production. Also, if the welder is engaged in shipboard welding, the coupon should be scheduled so as to be completed shipboard. G. The activity shall structure the welding of coupons so that all welding areas and equipment used for production welding are regularly employed for making test coupons from time to time.
H. If there is no production welding at the end of 92 days, the welder shall make a test coupon whenever the next production welding is started.
40.2.1.1 Except as permitted below, if the test coupon fails, the activity shall ascertain the cause of the failure and correct it and the welder is permitted to repeat the test coupon once. Failure of the second test coupon terminates all the welder's qualifications for titanium and full requalification is required. If the failure is due to a weld defect only, one bend specimen failure per test coupon is permitted provided two additional bend specimens of the same type are removed
Original 140
Made with FlippingBook - Share PDF online