This standard is issued under the fixed designation A /A M; the number 1 This practice is under the jurisdiction of ASTM Committee A01 on Steel. ASTM AAM_冶金/矿山/地质_工程科技_专业资料。ASTM A AM 碳钢、低合金钢和马氏体不锈钢铸件超声波检验操作. the original A /A M practice and requires calibration using a ASTM Standards: Procedure—When this procedure is to be applied to an inquiry.
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The supplementary requirements shall apply only when speci? Clustered indications shall not exceed the limits of the quality level designated by the customer purchase order in Table 4.
B Each indication that equals or exceeds the 0. ICS Number Code An isolated indication may be de? Link to Active This link will always route to the current Active version of the standard. It is not necessary that the ultrasonic signal exceed the amplitude reference line over the entire area.
A question on ASTM A
If you feel that your comments have not received a fair hearing you should make your views known to the ASTM Committee on Standards, at the address shown below. ASTM does not give any warranty express or implied or make any representation that the contents of this abstract are accurate, complete or up to date.
It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. Approved May aastm, The instrument to be used for examination shall be the ultrasonic, pulsed, reflection type.
If a09 are not, the cluster having the largest single indication shall be removed. It also provides supplementary requirements for angle beam testing.
At some locations within the limits of the indication, the signal may be less than the reference line, but nevertheless still present such that it may be judged as a continuous, signal indication. Personnel and equipment qualifications, materials preparation, casting and test conditions, data recording methods, and the acceptance standards for both types of testing procedure are all detailed thoroughly. Additional Transducer Evaluation Procedure B requires calibration using a back wall reflection from a series of solid calibration blocks.
Transducers shall be utilized at their rated astj. Signal evaluation is made by returning the attenuator or calibrated gain control to its original setting. NOTE 2—For block sizes over 3 in.
Search units shall have a frequency of 0. They may be as cast, blasted, ground, or machined. If gain is added and back echo is achieved without indication percent amplitude exceeding the 0. The point of marking shall be the center of the search unit.
Machined surfaces shall be acceptance inspected as soon as possible after machining. NOTE 3—Hole a690 be plugged following checking for ultrasonic response. The supplementary requirements shall apply only when specified individually by the purchaser in the purchase order or contract. Your comments will receive careful consideration at a meeting of the responsible technical committee, which you may attend.
The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. A method should be available to equalize signal response at different depths.
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Based on the signals-to-noise ratio of the response pattern of the casting, a frequency in the range from 0. Draw asrm curve through these marks on the screen or on suitable graph paper. NOTE 4—Counter bore shall be 1? The boundary limits of the indication shall be determined by marking a sufficient number of marks on the casting surfaces where the ultrasonic signal equals one half the reference amplitude, 0.
Combining values from the two aatm may result in non-conformance with the standard. Ultrasonic examination and radiography are not directly comparable. For a material thickness greater than 3 in. Ultrasonic acceptance or rejection criteria for individual castings should be based on a realistic appraisal of service requirements and the quality that can normally be obtained in production of the particular type of casting.
The area of the location, for the purpose of this evaluation, shall atsm considered the area that is con? If a procedure is not speci? Procedure B requires calibration using a back wall re? NOTE 5—In certain castings, because of very long metal path distances or curvature of the examination surfaces, the surface area over which a given discontinuity is detected may be considerably larger or smaller than the actual area of the discontinuity in the casting; in such cases, other criteria that incorporate a consideration of beam angles or beam spread must be aa609 for realistic evaluation of the discontinuity.
It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. This test method deals with the procedures for the standard practice of performing pulse-echo ultrasonic examination of heat-treated carbon, low-alloy, and martensitic stainless steel castings by the longitudinal-beam technique.
Next, select the test block whose overall length, C Fig. To completely delineate the indication, draw a line around the outer boundary of the center of the number of marks to form the indication area. NOTE 2— Areas shall be measured from the center a6099 the search unit. If the reason for loss asm back re? C The indications within a cluster with the cumulative areas traced shall be dispersed in a minimum surface area of the casting equal to 36 in. If it is not, obtain the best compromise between this block and the largest block of the series of 3 blocks being used for calibration.
Reference standards shall be? NOTE 1—Ultrasonic examination and radiography are not directly comparable. Historical Version s – view previous versions of standard. This examination technique is intended to complement Guide E94 in the detection of discontinuities.