S9074-AQ-GIB-010/248 Rev 1
4-5.2.4 Impact Test. When specified in the footnotes to table 7-7, specimens shall be prepared and tested. Test full specimen sets (at each temperature required for heat/lot conformance testing by the governing material specification, unless all test values at the lowest temperature also meet the minimum energy criteria for all other temperatures). Weld metal Charpy V-notch specimens shall be taken transverse to the axis of the weld groove with one surface of each specimen located a minimum of 1/16 inch below the finished surface of the weld after removal of weld reinforcement. The length of the notch shall be perpendicular to the surface of the weld. Base metal and HAZ specimens shall be removed in accordance with figure 7-2 and figure 7-24. Weld tests shall be evaluated to the requirements of the filler metal specification. Base metal and HAZ impact tests shall be evaluated to the requirements of the applicable base metal specification or per 4-5.2.4.2, as applicable. Dynamic tear testing shall be in accordance with ASTM E604 and may be substituted for Charpy V-notch testing as allowed in table 7-7, footnote 14. 4-5.2.4.1 Titanium Weld Metal Toughness Tests. If the design requires base material toughness properties, the weld metal shall also have the same toughness properties. 4-5.2.4.2 HAZ Toughness Criteria Where Base Material Criteria are Absent. Where toughness testing is required by the fabrication document or other governing specification and the base material(s) involved has no specified toughness requirements, base material and HAZ Charpy V-notch specimens shall be tested at the minimum design temperature. The average tested base metal toughness shall not exceed the average HAZ toughness by more than 10 percent or 5 ft-lbs, whichever is greater, unless approved by NAVSEA. 4-5.2.4.3 HSLA-65 HAZ Toughness. HSLA-65 HAZ tests shall meet a toughness of 30 ft-lbs minimum at -20 °F. 4-5.2.5 Hardness Test. Specimens shall be prepared and evaluated in accordance with figure 7-6. 4-5.2.6 Macro-Etch Specimens. Specimens shall be removed transverse to the weld, suitably prepared and etched to show weld cross-section, and examined at 5× to 10× magnification to the following requirements: a. Weld cladding or hardfacing. Discontinuities in the weld area up to and including 1/32 inch in length are acceptable. Incomplete fusion at weld/base metal interface is unacceptable. Certain wear-resistant alloys are subject to fine cracking that does not defeat the intended purpose. Accordingly, this fine cracking shall not be cause for rejection if confined to the weld deposit. b. All other welds. Discontinuities in the weld area greater than 1/32 inch or 10 percent of the thickness of the weld, whichever is less, are unacceptable. Each cross-section shall exhibit no cracks, except that linear or rounded conditions at the root of partial penetration welds (including welds with backing rings or straps that are not removed) are acceptable, provided they do not reduce weld thickness below the minimum allowance and provided they do not exceed 1/32 inch in length and adjacent linear defects are not closer than 1/8 inch. For partial penetration welds, root conditions outside the original joint configuration shall not be evaluated. The pipe or tube inner diameter surface of socket and seal welds shall reveal no melt-through, burn-through,
or oxidation beyond the visual inspection acceptance criteria of MIL-STD-2035. c. Tube-to-tubesheet and tube-to-header seal welds. In addition to 4-5.2.6.b above:
(1) Unless otherwise specified by the governing drawing, fabrication document, and so forth, weld throats (minimum leakage path) of all macro-etch specimens shall be no less than two-thirds of the specified wall thickness, and (2) Allowable linear root indications shall not exceed 0.015 inch, even if occurrence is below the original joint preparation. 4-5.3 SPECIAL TESTS. When tests, such as explosion-bulge, dynamic tear, hardness traverses, and other tests not detailed in this document are required, these tests will be specified by NAVSEA and information as to methods and guidance for performance of the required test and acceptance criteria will be provided at that time.
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