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 area of the location, for the purpose of this evaluation, shall be considered the area that is con? 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.
At some locations within the limits of the indication, the signal may be less than the reference line, but nevertheless still present such asgm it may be judged as a continuous, signal indication. Grid numbers shall be stenciled on the casting for record purposes and for grid area identity. Calibration shall be executed by either flat-bottomed hole or back-wall reflection.
Your comments will receive careful consideration at a meeting of the responsible technical committee, which you may attend. This will be the reference line for reporting discontinuity amplitudes.
Additional Transducer Evaluation Current edition approved May 1, It is astn necessary that the ultrasonic signal exceed the amplitude reference line over the entire area. Your comments are invited either for revision wstm this standard or for additional standards and should be addressed to ASTM International Headquarters.
If they adtm not, the cluster having the largest single indication shall be removed. Draw a line, using overlays or electronic markers, on the instrument screen, parallel to the sweep line, through the peak of the 1.
Individual reprints single or multiple copies of this standard may be obtained by contacting ASTM at the above address or at phonefaxor service astm. Users of this standard are expressly advised that determination of the validity of any such asrm rights, ast the risk of infringement of such rights, are entirely their own responsibility.
The point of marking shall be the center of the search unit. This standard is subject to revision at any time by the responsible technical committee and must be reviewed every? Additional supplemental blocks for testing thickness greater than 10 in. They may be as cast, blasted, ground, or machined.
Make a periodic calibration during the inspection by checking the amplitude of response from the 1? NOTE 2—The attenuator or calibrated gain control may be used to change the signal amplitude during examination to permit small amplitude signals to be more readily detected. The same couplant shall be used for calibrations and examinations.
If the reason astmm loss of back re? Machined surfaces shall be acceptance inspected as soon as possible after machining. If a procedure is not speci? The stenciled grid number shall appear in the upper right hand corner of the grid. Permission rights to photocopy the standard may also be secured from the ASTM website www. 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 aastm. Originally approved in Rejectable conditions are as follows and when any of the conditions listed below are found, the indications shall be removed and repair welded to the applicable process speci?
In order to avoid time loss in production, acceptance inspection of cast surfaces may be done prior to machining. Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard. When section thicknesses over 15 in.
A question on ASTM A
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 the cumulative areas traced are con? Adjust the gain of the instrument until the back re? They require external attenuators.
Based on the signals-to-noise ratio of the response pattern of the casting, a frequency in the range from 0. In order to accomplish this,?
Nominal Production Material Thickness tin. If gain is added and back echo is achieved without indication percent amplitude exceeding the 0. Signal evaluation is made by returning the attenuator or calibrated gain control to its original setting. NOTE 2—For block sizes over 3 in. Personnel and equipment qualifications, materials preparation, casting and test conditions, ashm recording methods, and the acceptance asfm for both types of testing procedure are all detailed thoroughly.
Approved May 1, Combining values from the two systems may result in non-conformance with the standard. NOTE 3—In certain castings, because of very long test distances or curvature of the test surface, the 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 plot that incorporates a consideration of beam spread should be used for realistic evaluation of the discontinuity.
Other instruments have decibel calibrated attenuators, in which case the required decibel must be removed.
ASTM A609/A609M – 12(2018)
NOTE 1—Ultrasonic examination and radiography are not directly comparable. Block fabricated with a 2-in. Procedure B requires calibration using a back wall re? The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Reference standards shall be?