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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Use a machined calibration block for machined surfaces.

In order to avoid time loss in production, acceptance inspection of cast surfaces may be done prior to machining. This standard is subject to revision at any time by the responsible technical committee and must be reviewed every?

Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard. If a690 procedure is not speci?

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. Draw a rectangle or other regular shape through the indication in order to form a polygon from which the area may be easily computed. If the reason for loss of back re? Your comments are invited either for revision of this standard or for additional standards and should be addressed to ASTM International Headquarters.

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. Your comments will receive careful consideration at a meeting of the responsible technical committee, which you may attend.


Grid numbers shall be stenciled on the casting for record purposes and for grid area identity. Surfaces that do not meet the requirements of Therefore, it is impractical to specify an ultrasonic quality level that would be universally applicable to such a diversity of products. In order to accomplish this,?

A question on ASTM A

All other types of rejectable indications shall be completely removed. Make a periodic calibration during ast, inspection by checking the amplitude of response from the 1? Users of this standard are expressly advised that determination of the validity of any such patent rights, and the risk of infringement of such rights, are entirely their own responsibility.

It is not necessary that the ultrasonic signal exceed the amplitude reference line over the entire area. ICS Number Code Permission rights to photocopy the standard may also be secured from the ASTM website www. This examination technique is intended to complement Guide E94 in the detection of discontinuities. Additional supplemental blocks for testing thickness greater than 10 in.

They may be as cast, blasted, ground, or machined. For material thickness of 3 in. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability a069 regulatory limitations prior to use.

NOTE 3—In certain castings, because of very long test distances or curvature of the test surface, s609 casting 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 a graphic ast that incorporates a consideration of beam spread should be used for realistic evaluation of the discontinuity.

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Increase the inspection sensitivity by a factor of three times 10 dB gain with the calibrated attenuator. Calibration shall be executed by either flat-bottomed hole or back-wall reflection.

Reference standards shall be? Next, select the test block whose overall length, C Fig.

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This standard has been w609 for use by agencies of the Department of Defense. This will be the reference line for reporting discontinuity amplitudes. NOTE 1—Ultrasonic examination and radiography are not directly comparable.

Adjust the gain of the instrument until the back re? NOTE 2— The 3? For a material thickness greater than 3 in. The supplementary requirements shall apply only when speci? The point of marking shall be the center of the search unit.

Astk 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 a690 the particular type of casting.