JB/T 7522-2004 (English Version) PDF

Scope: This standard specifies the test procedures for measuring ultrasonic velocity in materials using a Type A pulse reflection ultrasonic flaw detector. This standard describes a method for determining the ultrasonic velocity in a specimen of unknown material by comparative measurements with a reference material whose ultrasonic velocity is known. The sample measured in this standard refers to a solid material with a thickness greater than or equal to 5mm. The parallelism between its two surfaces perpendicular to the direction of ultrasonic energy propagation is within ±3°. The surface coupled to the ultrasonic probe must be better than Surface roughness of 3.2μm. More precise results can be obtained with other specially developed ultrasound instruments, auxiliary equipment and specialized techniques. Some other methods of measuring ultrasonic speed are listed in Appendix A. Note 1: Changes in factors including technology, instruments, material types and operators will cause changes in the absolute speed indication, sometimes even up to 5%. Note 2: Results affected by a single factor from the above are expected to be more accurate (possibly within a 1% tolerance).

JB/T 7522-2004 history

2004 JB/T 7522-2004 Ultrasonic Velocity Measurement Method for Nondestructive Testing Materials
1994 JB/T 7522-1994 Method for Measuring Ultrasonic Velocity of Materials