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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Current edition approved May 1, Therefore, it is impractical to specify an ultrasonic quality level that would be universally applicable to such a diversity of products. Search units shall have a frequency of 0. Draw a rectangle or other regular shape through the indication in order to form a polygon from which the area may be easily computed.

NOTE 3—In certain castings, because of atm long test distances or curvature of the test surface, the casting surface area over which a given discontinuity is detected may be considerably a6609 or smaller than the actual area of the discontinuity in the casting; in such cases a graphic plot that sstm a consideration of beam spread should be used for realistic evaluation of the discontinuity. For a material thickness greater than 3 in.

They require external attenuators.

The stenciled grid number shall appear in the upper right hand corner of the grid. Your comments will receive careful consideration at a meeting of the responsible technical committee, which you may attend. Draw a line, using overlays or electronic markers, on the instrument screen, parallel to asstm sweep line, through the peak of the 1. In order to accomplish this,? Approved May 1, Additional supplemental blocks for testing thickness greater than 10 in.

Additional Transducer Evaluation Grid numbers shall be stenciled on the casting for record purposes and for grid area identity. Next, select the test block whose overall length, C Fig. Personnel and equipment qualifications, materials preparation, casting and test conditions, data recording methods, and the acceptance standards for both types of testing procedure are all detailed thoroughly.


Permission rights to photocopy the standard may also be secured from the ASTM website www. In order to avoid time loss in production, acceptance inspection of cast xstm may be done prior to machining.

BoxArlingate Ln. Reference standards shall be?

Your comments are invited either for revision of this standard or for additional standards and should be addressed to ASTM International Headquarters. For material thickness of 3 in. Surfaces that do not meet the requirements of a60 An isolated indication may be de?

This abstract is a adtm summary of the referenced standard. The point of marking shall be the center of the search unit. The maximum signal amplitude for the test blocks used shall peak at approximately three-fourths of the screen height above the sweep by use of the attenuator. Nominal Production Material Thickness tin. Other couplants may be used when agreed upon between the purchaser and supplier. Clustered indications shall not exceed the limits of the quality level designated by the customer purchase order in Table 4.

Whenever no discernible surface tracing is possible, each indication which equals or exceeds the 0. Adjust the gain of the instrument until the back re? Calibration shall be executed by either flat-bottomed hole or back-wall reflection. All other types of rejectable indications shall be completely removed.

A question on ASTM A

If gain is added and back echo is achieved without indication percent amplitude exceeding the 0. The instrument to be used for examination shall be the ultrasonic, pulsed, reflection type.

A number in parentheses indicates the year of last reapproval. Repair welds may be inspected before the postweld heat treatment. Procedure B requires calibration using a back aastm reflection from a series of solid calibration blocks. Draw a curve through these marks on the screen or on suitable graph paper.


Machined surfaces shall be acceptance inspected as soon as possible after machining.

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B Each indication that equals or exceeds the 0. NOTE 5—In certain castings, because of very long metal path distances aztm curvature of the examination surfaces, the 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, other criteria that incorporate a consideration of beam angles or beam spread must be used for realistic evaluation of the discontinuity.

The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. The supplementary requirements shall apply only when speci?

If the reason for loss of back re? The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other.

If the cumulative areas traced are con? 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.

Use a machined calibration block for machined surfaces. 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.

When section thicknesses over 15 in. NOTE 4—Counter bore shall be 1?