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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Approved May 1, Permission rights to photocopy the standard may also be secured from the ASTM website www. If a procedure is not speci? 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.
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? Repair welds may be inspected before the postweld heat treatment. 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.
Linearity shall be determined in accordance with Practice E or equivalent electronic means. Ultrasonic examination and radiography are not directly comparable.
Machined surfaces shall be acceptance inspected as soon as possible after machining. NOTE 2— Areas shall be measured from the center of the search unit. Clustered indications shall not exceed the limits of the quality level designated by the customer purchase order in Table 4. If they are not, the cluster having the largest single indication shall be removed.
In order to accomplish this,? 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.
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. The side-drilled hole used for the 1? For material thickness of 3 z609. 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 systems may result in non-conformance with the standard. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. 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.
NOTE 2—The attenuator adtm calibrated gain control may be used to change the signal amplitude during examination to permit small amplitude signals to be more readily detected. This standard is subject to revision at any time by the responsible technical committee and must be reviewed every? Still other instruments do not have calibrated gains or attenuators. Link to Active This link will always route to the current Active version of the standard.
An isolated indication may be de? They may be as cast, blasted, asfm, or machined.
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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. It also provides supplementary requirements for angle beam testing.
NOTE 1—Ultrasonic examination and radiography are not directly comparable. Where the distance between indications is less than the lowest dimension of the largest indication in the group, the cluster shall be repair welded. Other instruments have decibel calibrated attenuators, in which case the required decibel must be removed. Make a periodic calibration during the inspection by checking the amplitude of response from the 1?
This abstract is a brief summary of the referenced standard. Block fabricated with a 2-in.
A question on ASTM A
Originally approved in NOTE 2— The 3? The point of marking shall be the center of the search unit. NOTE 4—Counter bore shall be 1? Transducers shall be utilized at their rated frequencies.
The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other.
Other couplants may be used when agreed upon between the purchaser and supplier.
Qstm 3—Hole shall be plugged following checking for ultrasonic response. All other types of rejectable indications shall be completely removed. NOTE 2—For block sizes over 3 in. 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.