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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This will be the reference line for reporting discontinuity amplitudes.
ASTM A609/A609M – 12(2018)
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. 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.
The stenciled grid number shall appear in the upper right hand corner of the grid. Therefore, it is impractical atsm specify an ultrasonic quality level that would be universally applicable to such a diversity of products. Still other instruments do not have calibrated gains or attenuators.
The instrument to be used for examination shall be the ultrasonic, pulsed, reflection type. Link to Active This link will always route to the current Active version of the standard. Combining values from the two systems may result in non-conformance with the standard. The same couplant shall be used for calibrations and examinations. Nominal Production Material Thickness tin.
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Originally approved in Use a machined calibration block for machined surfaces. 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.
Place the search unit on the casting at the transfer point and adjust the instrument gain until the back re? The area of the location, for the purpose of this evaluation, shall be considered the area that is con? If they are not, the cluster having the largest single indication shall be removed.
All other types of rejectable indications shall be completely removed. The maximum signal amplitude a069 the test blocks used shall astk at approximately three-fourths of the screen height above the sweep by use of the attenuator. B Each indication that equals or exceeds the 0. Your comments are invited either for revision of this standard or for additional standards and should be addressed to ASTM International Headquarters.
Your comments will receive careful consideration at a meeting of the responsible technical committee, which you may attend.
NOTE 2—The attenuator or calibrated gain control may be used to change the signal amplitude during examination asmt permit small amplitude signals to be more readily detected. Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard.
This abstract is a brief summary of the referenced standard. Other couplants may be used when agreed upon asrm the purchaser and supplier. Grid numbers shall be stenciled on the casting for record purposes and for grid area identity.
A question on ASTM A
When section thicknesses over 15 in. Where the distance between indications is less than the lowest dimension of the largest indication in the group, the cluster shall be repair welded.
The supplementary requirements shall apply only when specified individually by the purchaser in the purchase order or contract. A number in parentheses indicates the year of last reapproval. Draw a rectangle xstm other regular shape through the indication in order to form a polygon from which the area may be easily computed.
Adjust the gain of the instrument until the back re? Signal evaluation is made by returning the attenuator or calibrated gain control to its original setting. 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.
It is not necessary that the ultrasonic signal exceed the amplitude reference line over the entire area. Procedure B requires calibration using a back wall re? The point of marking shall be the center of the search unit. ICS Number Code 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.
The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Draw a curve through these marks on the screen or on suitable graph paper.
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. An isolated indication may be de?
NOTE 1—Ultrasonic examination and asstm are not directly comparable. This standard has been approved for use by agencies of the Department of Defense. Ultrasonic Testing Quality Level 1 2 3 4 5 6 7 Area, in.
Approved May 1, 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. Increase the inspection sensitivity by a factor of three times 10 dB gain with the calibrated attenuator.
Make a periodic calibration during the inspection by checking the amplitude of response from the 1?