ASME V Article 5 Ultrasonic Examination Methods for Materials This Article provides or references requirements, which are to be used in selecting and developing ultrasonic examination procedures for parts, components, materials, and all thickness determinations. Definitions of terms used in this Article are contained in Mandatory Appendix of this article. !hen "A, "#, and "$ documents are referenced, they are located in Article %&. Basic Requirements The requirements of this article shall be used together with Article ', (eneral )equirements. Written Procedure Requirements Requirements. *ltrasonic examination shall be performed in accordance with a written procedure, which shall, as a minimum, contain the requirements listed in Table T+%%. The written procedure shall establish a single value, or range of values, for each requirement. Procedure Qualification. !hen procedure qualification is specified, a change of a requirement in Table T+%% identified as an essential variable from the specified value, or range of values, shall require requalification of the written procedure. A change of a requirement identified as a nonessential variable from the specified value, or range of values, does not require requalification of the written procedure. All changes of essential or nonessential variables from the value, or range of values, specified by the written procedure shall require revision of, or an addendum to, the written procedure. Equiment !nstrument A pulse+echo type of ultrasonic instrument shall be used. The instrument shall be capable of operation at frequencies over the range of at least ' M- to M-, and shall be equipped with a stepped gain control in units of %./ d# or less. f the instrument has a damping control, it may be used if it does not reduce the sensitivity of the examination. The re0ect control shall be in the 1off2 position for all examinations unless it can be demonstrated that it does not affect the linearity of the examination. Search Units The nominal frequency shall be from ' M- to M- unless variables such as production material grain structure require the use of other frequencies to assure adequate penetration or better resolution. "earch units with contoured contact wedges ma y be used to aid ultrasonic coupling. "oulant
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#eneral. #eneral. The couplant, including additives, shall not be detrimental to the material being examined. 3ontrol of 3ontaminants 4a5 3ouplants used on nickel base alloys shall not contain more than %/ ppm of sulfur. 4b5 3ouplants used on austenitic stainless steel or titanium shall not contain more than %/ ppm of halides 4chlorides plus fluorides5. "ali$ration Bloc% Requirements The material from which the block is fabricated shall be of the same product pr oduct form, material specification or equivalent 6+7umber grouping, and heat treatment as the material being examined. 8or the purposes of this paragraph, par agraph, 6+7os. ', &, 9, and materials are considered equivalent. The finish on the scanning surface of the block shall be representative of the scanning surface finish on the material to be examined. &u$ular Product "ali$ration Bloc%s 4a5 The calibration reflectors shall be longitudinal 4axial5 notches and shall have a length not to exceed ' in. 4% mm5, a width not to exceed ':'; in. 4'.; mm5, and depth not to exceed /.//9 in. 4/.'/ mm5 or < of the nominal wall thickness, whichever is larger. 4b5 The calibration block shall be long enough to simulate the handling of the product being examined through the examination equipment. "astin' "ali$ration Bloc%s. Bloc%s . 3alibration blocks shall be the same thickness =%< as the casting to be examined. >isit our site to download http://goo.gl/2HJTcv
