ASTM-A995/A995M:2020 pdf free download – Standard Specification for Castings, Austenitic-Ferritic (Duplex) Stainless Steel, for Pressure-Containing Parts.
S 10. F4xamination of Weld Preparation
S 10.1 Liquid penetrant examination of cavities prepared for welding shall be performed to verify removal of those discontinuities found unacceptable by the inspection method specified for the casting. The method of performing liquid penetrant examination shall he in accordance with Practice E165/ E165M. Unless other degrees of shrinkage or types of discontinuities found in the cavities are specified. Type II. Internal Shrinkage, of Reference Photographs E125, of Degree 2 in sections up to 2 in. 150 mml thick, and of Degree 3 in sections over 2 in. 150 mmj thick shall he acceptable.
Sil. Post-Weld Heat Treatment
S 11.1 Castings shall be given a post-weld solution heat treatment in accordance with Table 1.
S12. Prior Approval of Major Weld Repairs
Other supplementary requirements considered suitable for USC With this specilication are:
S50. Estimating Ferrite Content
S50. I Ferrite contents shall be determined by point count (Test Method E562), by other quantitative metallographic methods such as image analysis. by measurement of magnetic response. or by other methods upon agreement between the manufacturer and the purchaser. Frequency of testing and location of tests shall be by agreement between the manufacturer and the purchaser.
S51. Prior Approval of Weld Material
S5l.l The purchaser must give approval of all weld filler materials to he used prior to any weld repairs.
S52. Additional Requirements for Grade 6A
S52.4.2 When the thickness of the qualification COUOfl is less than or equal to 4 in. 11(X) rnml. and the qualification coupon is not subjected to a post-weld solution heat treatment. Charpy impact testing shall he performed at one of the test temperatures listed in Table S52.3. The test temperature shall he provided by the purchaser. If the test temperature is not specified, the test temperature used shall he —5 1 °F [—46 °CI. Charpy impact test locations shall be at the weld cap and mid-thickness of the weld deposit. Three specimens shall he removed from each of these three locations: the fusion line. fusion line + 2 mm, and fusion line + 5 mm. The average value of the three specimens shall not be less than specified in Table S52.3. with flO more than OflC value permitted below the average minimum specified and no value permitted below the minimum specified for a single specimen.
S52.4.3 When the thickness of the qualification coupon is greater than 4 in. 11(X) mml. test temperature. specimen location and quantity, and absorbed energy values shall be agreed upon between the purchaser and the manufacturer.
S52.4.4 A Test Methods G48 Method A test shall he performed on a sample removed from the weld qualification coupon: the sample shall include approximately 50 % weld material and 50 % base material. Weld lest coupons subjected to a post-weld solution heat treatment shall he tested at ) cc. Weld test coupons not being subjected to a post-weld solution heat treatment shall be tested at 50 °C. Regardless of heat treat condition, the acceptance criteria and test time shall be the same as outlined in S52.3.