Abstract:At first, this paper discusses the nondestructive testing method of alloy bearing for common inservice turbo generator. And after that, it compared the strengths and weaknesses of ultrasonic testing and penetration testing technologies according to the structural features of bearing and the characteristics of defects. At the end of this paper, it describes the practice applications of the two technologies in bearing testing.

Keywords:turbo generator, alloy bearing, ultrasonic testing, penetration testing