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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Permission rights to photocopy the standard may also be secured from the ASTM website www. This will be the reference line for reporting discontinuity amplitudes. They may be as cast, blasted, ground, or machined.
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 z609 incorporates a consideration of beam spread should be used for realistic evaluation of the discontinuity. The side-drilled hole used for the 1?
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.
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. 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. It is informational only and not an official part of the standard; the full text of the standard itself must be referred to for its use and application.
Based on the signals-to-noise ratio of the response pattern of the casting, a frequency in the range from 0.
Transducers shall be z609 at their rated frequencies. Reference standards shall be? Signal evaluation is made by returning the x609 or calibrated gain control to its original setting. Machined surfaces shall be acceptance inspected as soon as possible after machining.
A method should be available to equalize signal response at different depths. If the cumulative areas traced are con? Search units shall have a frequency of 0. NOTE 2— The 3? It is not necessary that the ultrasonic signal exceed the amplitude reference line over the entire area.
A question on ASTM A
Therefore, it is impractical to specify an ultrasonic quality level that would be universally applicable to such a ast of products. 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. 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.
Place the search unit on the casting at the transfer point and adjust the instrument gain until the back re? 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. The supplementary requirements shall aatm only when 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.
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This standard has been approved for use by agencies of the Department of Defense. It also provides supplementary requirements for angle beam testing.
NOTE 2—For block sizes over 3 in. Whenever no discernible surface tracing is possible, each indication which equals or exceeds the 0. It also provides supplementary requirements for angle beam testing. 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.
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. Combining values from the two systems may result in non-conformance with the standard. Individual reprints single or multiple copies of this standard may be obtained by contacting ASTM at the above address or at phonefaxor service astm.
Clustered indications shall not exceed the limits of the quality level designated by the customer purchase order in Table 4.
Make a periodic calibration during the inspection by checking the amplitude of response from the 1? BoxArlingate Ln.