S9074-AQ-GIB-010/248 Rev 1
NOTES (continued): 5. Positions of welding shall be per table 7-9.
6. The entire completed weld surface shall be machined and then VT and PT inspected per 5-4 to the criteria of notes 7 or 8 as applicable. After NDT, a total of three macro-etch specimens shall be tested from each weld per 5-4. For 5G and 6G welds, macro- etch specimens shall be taken from the approximate 3, 6, and 9 o’clock locations; for 1G and 2G welds, the center test specimen location shall be separated by approximately 90 to 120 degrees from the surrounding locations. Hardness or composition testing shall also be performed where required by notes 7 or 8 at the thickness specified. 7. Hardfacing (a) Weld Thickness and Layers. Test weld deposited thickness should be approximately equal to the un-machined weld thickness to be deposited in production; weld layers and machined weld thickness shall be per notes 7(a)(i) or 7(a)(ii) below, as applicable. Qualified weld thickness and weld layers shall be per table 7-10, footnote 16 and as specified by notes 7(a)(i) or 7(a)(ii) below: (i) To qualify production welds of two layers minimum having a finished machined thickness of 3/16 inch minimum, at least two layers shall be deposited for the test weld. The test weld shall be machined to 3/16 inch before testing. A greater machined weld thickness may be used if required to support large qualified weld thicknesses per table 7-10. (ii) To qualify production welds having a minimum of one layer or a finished machined thickness of less than 3/16 inch, the number of layers deposited for the test weld should represent what is intended for production welding. The test weld shall be machined to the minimum number of layers and minimum machined thickness to be qualified for production. If necessary, etching shall be employed to discern the weld layer at which hardness testing is performed. (b) VT and PT Acceptance Criteria. The criteria of figure 7-6, note 4 shall apply. (c) Hardness Test. After NDT and machining to the thickness specified by 7(a) above, four evenly spaced hardness readings shall be taken on the surface; for 5G or 6G position test welds where uphill progression welding on the first layer occurs at the 9 o’clock and/or 3 o’clock location, take one reading at one of these uphill progression locations. Testing shall conform to AWS B4.0 utilizing the test method corresponding to the hardness value specified by the following applicable specification, or as otherwise approved: each reading shall meet the minimum hardness specified in the applicable Department of Defense specification, commercial specification, manufacturer’s data sheet, or table 7-2, footnote 6, as applicable. Should one or more of these readings fail these criteria, five additional readings may be taken from each failure site and averaged; each average shall meet the hardness criteria of this note. 8. Cladding. (a) Weld Thickness and Layers. Test weld deposited thickness should be approximately equal to the un-machined weld thickness to be deposited in production; weld layers and machined weld thickness shall be per notes 8(a)(i) or 8(a)(ii) below, as applicable. Qualified weld thickness and weld layers shall be per table 7-10, footnote 16 and as specified by 8(a)(i) or 8(a)(ii) below: (i) For production welds (with or without composition being required per figure 7-4, note 5a) where two layers minimum and a finish machined thickness of 3/16 inch minimum is to be qualified, the test weld shall be two layers minimum and the weld shall be machined to 3/16 inch or greater thickness. Composition testing of the test weld is not required. (ii) For production welds where both (1) composition is required per figure 7-4, note 5a and (2) either one layer minimum or a finished machined weld thickness of less than 3/16 inch is to be qualified, the number of layers deposited for the test weld should represent what is intended for production welding. The test weld shall be machined to the minimum number of layers and minimum machined thickness to be qualified for production and then tested for composition per 8(c) below. If necessary, etching shall be employed to discern the weld layer at which composition testing is performed. (b) VT and PT Acceptance Criteria. Figure 7-4, note 4 criteria shall apply. (c) Composition Testing. Where required by note 8(a)(ii) above, after machining, perform one composition test. The location of the test shall be towards the center of the weld width, and the following: (i) For 5G or 6G position test welds where uphill progression welding on the first layer occurs at the 9 o’clock and/or 3 o’clock location, perform composition testing at one of the uphill progression loca tions. (ii) For other position test welds, circumferential location of the composition test site is discretionary. Machining, testing, and results shall conform to figure 7-4, note 6.
Figure 7-17A. Performance Qualification Test No. 9 for Hardfacing and Cladding for Circumferential Welding of Cylindrical Materials (for Propulsion Shafting, see MIL-STD-2191) - Continued
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