14. Test Methods
14.1 The tensile properties shall be determined in accordance with Test Methods B 557.
15. Retests
15.1 If the results of the tension test do not conform to the requirements prescribed in Table 2, test bars representative of the castings may be retested in accordance with the replacement tests and retest provisions of Test Methods B 557 and the result of retcsts shall conform to the requirements as to mechancial properties specified in Table 2.
16. Workmanship, Finish, and Appearance
16.1 The finished castings shall he uniform in composition and free of hlowholes, cracks, shrinks, and other discontinuities in accordance with standards designated and agreed upon as acceptable by the purchaser.
17. Heat Treatment
17.1 When castings are to be heat treated, the practice
shall be in accordance with Practice B 597. Heat treatment shall be performed on the whole casting and never on a portion.
18. Repair of Castings
18.1 Castings may he repaired only by processes approved and agreed upon by the producer and purchaser, such as. welding,impregnation. peening, blending. soldering, etc. Limitations on the extent and frequency of such repairs. and methods of inspection of repaired areas should also be agreed upon.
18.2 The welding procedure and the welders shall he qualified in accordance with Section IX of the ASME Code.
18.3 Repairing of Castings Produced for Governmental and Military Agencies:
18.3.1 Welding: When welding is permitted, it shall he done by methods suitable for the particular alloy. Welding methods shall be in accordance with such specifications as are referenced on the applicable drawings, or as are required by the contract or order. All welding shall be done by qualified welders and by methods approved by the purchaser. When castings are to be supplied in the heat treated condition, they shall be heat treated to the required temper after welding, except that small arc welds may he performed without subsequent heat treatment upon approval of the purchaser.
examinea raaiograprucally aiter au reworking anci neat treatment have been completed. All welds shall be free from cracks, lack of fusion and meet the same quality requirements as the parent material. Welded castings shall be marked with a symbol of three concentric circles with a letter or number designating the welder adjacent to the symbol. The outer circle of the symbol shall be no larger than in. (6 mm) in outside diameter. All welded areas shall bc encircled rith a ring or white paint prior to submission for final inspection. Repair welding of castings used in naval shipboard pressure vessels,piping systems, and machinery shall be performed in accordance with requirements for repair of castings specified in MIL-STD-278.
18.4 Jinpregliation — When impregnation is permitted, it shall be to correct general seepage leaks only and shall not be used to correct poor foundry technique or porosity in excess of accepted standards. It shall be accomplished in accordance with MIL-STD-276 or, when specified, MIL 1-13857. Unless otherwise authorized by the purchaser, castings that have been impregnated shall be marked
18.5 Peening — When peening is permitted. it shall be to correct localized minor seepage leaks and small surface imperfections only, or to disclose subsurface voids for the purpose of inspection. Peening will not be permitted to repair cracks, cold shuts, shrinks, misruns, defects due to careless handling, or other similar major defects. Peening may he accomplished either hot or cold and shall he performed by methods that are acceptable to the purchaser. Peened castings shall be marked with Maltese cross approximately /4 in. (6 mm) high.
18.6 Blending Blending with suitable grinders or other tools will be permitted for the removal of surface imperfections only, and shall not result in dimensions outside the tolerances shown on the applicable drawings.