In response to the typical crack defects caused by the flange connection bolts of the high-pressure steam pipe of the generator set turbine during use,the limitations of magnetic particle testing and penetration testing processes were analyzed.Based on the comprehensive consideration of the structure,material,and construction period requirements of these types of bolts,it was determined to use a combina-tion process of ultrasonic longitudinal wave straight probe and transverse wave oblique probe for testing,and verified through magnetic particle testing.The inspection results indicate that the combination detec-tion method is reliable and efficient.Combined with magnetic particle testing,it can provide a more intui-tive defect observation effect and also provide reference and reference for other bolts of the same type to a-dopt this combination detection process.
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