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.
|Published (Last):||18 September 2018|
|PDF File Size:||6.27 Mb|
|ePub File Size:||18.57 Mb|
|Price:||Free* [*Free Regsitration Required]|
For material thickness of 3 in. Place the search unit on the casting at the transfer point and adjust the instrument gain until the back re? 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.
Your comments will receive careful consideration at a meeting of the responsible technical committee, which you may attend.
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.
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. If they s609 not, the cluster having the largest single indication shall be removed.
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 sstm be used for realistic evaluation of the discontinuity. Your comments are invited either for revision astj this standard or for additional standards and should be addressed to ASTM International Headquarters.
Referenced Documents purchase separately The documents z609 below are referenced within the subject standard but are not provided as part of the standard. The supplementary requirements shall apply only when specified individually by the purchaser in the purchase order or contract.
Nominal Production Material Thickness tin. Still other instruments do not have calibrated gains or attenuators. They may be as cast, blasted, ground, or machined. If a procedure is not speci? Draw a a690, using overlays or electronic markers, on the instrument screen, parallel to the sweep line, through the peak of the 1.
The Largest Open Access Portal of Nondestructive Testing (NDT)
For a material thickness greater than 3 in. 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. Draw a curve through these marks on the screen or on suitable graph paper.
It also provides supplementary requirements for angle beam testing. NOTE 2—For block sizes over 3 in.
Individual reprints single or multiple copies of this standard may be obtained by contacting ASTM at the above address or at phonefaxor service astm. They require external attenuators. It is not necessary that the a690 signal exceed the amplitude reference line over the entire area. An isolated indication may be de?
NOTE 3—Hole shall be plugged following checking for ultrasonic response. Surfaces that do not meet the requirements of Linearity shall be determined in accordance with Practice E or equivalent electronic means. Ultrasonic examination and radiography are not directly comparable. Current edition approved May 1, B Each indication that equals or exceeds the 0. 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.
Whenever no discernible surface tracing is possible, each indication which equals or exceeds the 0. A method should be available to equalize signal response at different depths.
Clustered indications shall not exceed the limits of the quality level designated by the customer purchase order in Table 4. Grid numbers shall be stenciled on awtm casting for record purposes and for grid area identity. The stenciled grid number shall appear in the upper right hand corner of the grid.
A question on ASTM A
This standard has been approved for use by agencies of the Department of Defense. 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. Transducers shall be utilized at their rated aastm. When grids are laid out on the casting surface and they encompass different a069 levels, each speci?
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.