S9074-AQ-GIB-010/248 Rev 1
5-3.6 TUBE-TO-HEADER SEAL WELDING OF BOILER COMPONENTS. Welders shall be qualified on a test assembly consisting of four joints that are welded in the sequence of 4-4.8. Joint design shall simulate the production joint except as specified by 4-4.8.1.b. S-1 material may be used. The requirements of this paragraph apply only to manual welding. Qualification shall otherwise be in accordance with 4-4.8. The requirements of this paragraph do not negate any additional requirements that may be imposed by specific component fabrication or repair documents. 5-3.6.1 Space Restrictions. Welding shall be performed under the space restrictions depicted by figure 7-25. The entire space restriction assembly shall be held at 400 °F minimum for the entire test, except as needed for root nondestructive testing. The welder shall perform all grinding and any repair weld preparation in the heated assembly. The inspection sequence shall be as follows: complete all root welds, then inspect; complete all welds, then inspect. 5-3.6.2 Nondestructive Testing. The root pass and finished welds of the test assembly shall be nondestructively tested in accordance with 4-4.8.1.e, f, and i. Undercut of 1/32 inch maximum is permissible along the plate weld toes. 5-3.6.3 Macro Testing. After successful nondestructive testing, all four welds shall be macrosectioned and examined in accordance with 4-4.8.1.g and i. 5-3.6.4 Positions. Qualification position shall be in accordance with table 7-9. 5-3.6.5 Repairs. Failure of either the root pass or final weld by nondestructive testing on more than one joint or by other testing on any joint shall constitute failure of the qualification test. Repair of the test assembly per 5-2.8.b as a result of a root pass defect shall preclude further repair. 5-3.7 LOCK WELDS. Lock welds shall be qualified by either (1) a mock-up test per 4-4.9, but with visual and dye penetrant inspection only or (2) a butt, fillet, or where applicable, socket weld test per 4-4.9. In both cases, qualified positions and filler materials shall be per Chapter 5. 5-4 TEST AND EVALUATION OF QUALIFICATION TEST ASSEMBLIES. This section provides for evaluation of test assemblies required for qualification. The tests required for each assembly are as specified in table 7-11. For suggested removal of destructive test specimens (when used), see figures 7-12 through 7-17A. 5-4.1 NONDESTRUCTIVE INSPECTION. 5-4.1.1 Visual Examination. Visual examination shall be performed for weld surface geometry and weld surface soundness. Titanium and titanium alloy welds shall also be inspected per 4-5.1.1.1. 5-4.1.2 Nondestructive Test Performance. Visual and other nondestructive testing shall be performed in accordance with NAVSEA T9074-AS-GIB-010/271 and, for titanium, 4-5.1.1.1. Except as permitted by 5-4.1.3, test assembly welds shall be 100-percent inspected. 5-4.1.3 Acceptance Standards. Acceptance standards for nondestructive testing shall be per 4-5.1.3. For fillet and butt plate assemblies, 1 inch maximum of weld on each end of the test assembly is exempt from inspection, except for titanium and titanium alloy weld appearance per 4-5.1.1.1. 5-4.2 DESTRUCTIVE TESTS. Required specimen preparation, dimensions, and mechanical testing shall be in accordance with AWS B4.0. 5-4.2.1 Guided-Bend Tests. Acceptance standards shall be as specified in 4-5.2.3.1. 5-4.2.2 Break Test. The tack and fillet welder qualification test specimen shall be flattened in accordance with figure 7-16 such that the root of the weld is in tension. The load shall be steadily increased until the specimen fractures. The fractured surfaces shall be visually examined without magnification and shall conform to the criteria of 4-4.1.11.
5-6
Made with FlippingBook - Share PDF online