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本标准适用于壁厚25～102mm、内径与壁厚之比等于或大于5∶1的汽轮发电机非磁性钢护环和其它合金钢护环的超声探伤.1 应用前提1.1 本标准采用脉冲反射式超声横波斜入射和纵波垂直入射的接触法进行探伤,但不限制使用其它行之有效的方法(如液浸法).1.2 从事护环锻件探伤的人员,应持有有关部门颁发的相应资格的证书,并能正确理解和使用本标准.
This standard applies to the wall thickness of 25 ~ 102mm, the ratio of inner diameter to wall thickness equal to or greater than 5: 1 ultrasonic testing of non-magnetic steel ring and other alloy steel retaining ring of the generator.1 Application preconditions 1.1 This standard uses a pulse Reflective ultrasonic transverse wave oblique incidence and longitudinal wave vertical incidence of contact testing for flaw detection, but does not limit the use of other effective methods (such as liquid immersion) .1.2 engaged in retaining ring forgings of personnel should hold the relevant departments issued the corresponding Qualified certificate, and can correctly understand and use this standard.