船用曲轴作为船用发动机的主要零部件,各国船级社对其质量要求是非常严格的,其曲轴主轴颈、连杆颈的R角区域是检测的重点部位(图1)。图1曲轴轴颈、连杆颈R角剖面图及探伤区域划分笔者公司经过认真探索和试验,总结出利用超声波横波、采用特制的标准平底孔专用试块来检测超声波纵 Marine crankshaft as a marine engine’s main components, the classification societies of their quality requirements are very strict, the crankshaft journals, connecting rod neck R corner area is the key part of the test (Figure 1). Figure 1 Crankshaft journal, connecting rod R angle cross-sectional view and testing area division The company after careful exploration and testing, summed up the use of ultrasonic shear wave, the use of special standard flat-bottomed hole dedicated test block to detect ultrasonic longitudinal