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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For material thickness of 3 in. The instrument to be used for examination shall be the ultrasonic, pulsed, reflection type.
When section thicknesses over 15 in. Signal evaluation is made by returning the attenuator or calibrated gain control to its original setting.
A question on ASTM A
The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. B Each indication that equals or exceeds the 0. 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.
Machined surfaces shall be acceptance inspected as soon as possible after machining. Place the search unit on the casting at the transfer point and adjust the instrument gain until the back re? Additional supplemental blocks for testing thickness greater than 10 in. Additional Transducer Evaluation The supplementary requirements shall apply only when speci?
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The point of marking shall be the center of the search unit. Increase the inspection sensitivity by a factor of three times 10 dB gain with the calibrated attenuator. 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.
If a procedure is not speci? The same couplant shall be used for calibrations and examinations. If the reason for loss of back re? Draw a rectangle or other regular shape through the indication in order to form a polygon from which the area may be easily computed. Grid numbers shall be stenciled on the casting for record purposes and for grid area identity. Transducers shall be utilized at their rated frequencies.
The side-drilled hole used for the 1? All other types of rejectable indications shall be completely removed.
The area of the location, for the purpose of this evaluation, shall be considered the area that is con? Linearity shall be determined in accordance with Practice E or equivalent electronic means.
Therefore, it is impractical to specify an ultrasonic quality level that would be universally applicable to such a diversity of products. Procedure B requires calibration using a back wall re?
ASTM A609/A609M – 12(2018)
The stenciled grid number shall appear in the upper right hand corner of the grid. Nominal Production Material Thickness tin. Combining values x609 the two systems may result in non-conformance with the standard. Whenever no discernible surface tracing is possible, each indication which equals or exceeds the 0.
Current asttm approved May 1, A number in parentheses indicates the year of last reapproval. 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. Make a periodic calibration during the inspection by checking the amplitude of response from the 1?
The boundary limits of the indication shall be determined by marking a sufficient number of marks on the casting surfaces where the ultrasonic z609 equals one half the reference amplitude, 0.
This will be the reference line for reporting discontinuity amplitudes. Repair welds may be inspected before the postweld heat treatment. To completely delineate the indication, draw a line around the outer boundary of the center of the number of marks to form the a6009 area.
Historical Version s – view previous versions of standard. NOTE 5—In certain castings, because of very long metal path distances or curvature of the examination surfaces, the surface area over which a given discontinuity is detected atm 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.
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.
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 supplementary requirements shall apply only when specified individually by the purchaser in the purchase order or contract.
Search units shall have a frequency of 0. Next, select the test block whose overall length, C Fig.