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本标准适用于JB 1266-72《电站汽轮机和船用汽轮机叶轮锻件技术条件》中各类叶轮锻件的超声探伤.其它轮盘状锻件可参考使用.1 应用前提1.1 本标准采用2～2.5兆赫的探测频率,按脉冲反射式原理,在叶轮锻件的全端面上(即轮壳、轮腹、轮缘的两个端平面上)进行直探头接触法探伤,探头的最大直径为28毫米.必要时可使用其它行之有效的方法(如变换探测频率、探头规格、增加探伤面等)进行检查.
This standard applies to JB 1266-72 “power station steam turbine and marine turbine impeller forgings technical conditions” of various types of impeller forgings ultrasonic flaw detection. Other disc-shaped forgings can be used for reference .1 Application prerequisites 1.1 This standard uses 2 ~ 2.5 MHz detection Frequency, according to the principle of pulse reflection, direct contact with the whole surface of the impeller forgings (ie, wheel shell, belly, the two ends of the flange plane) contact detection method, the maximum probe diameter of 28 mm. Use other proven methods (such as changing the detection frequency, probe specifications, increase the test surface, etc.) to be checked.