A New Ultrasonic Testing Technique for Small Bars and Inquisition for Relevant Theory

摘要

Ultrasonic testing for materials with coarse grain structure has been a sticky business for a long tiem past, especially the testing for small bars with coarse grain structure. In this paper, a new ultrasonic testing method-immersion focussed creep wave method is presented. Relevant theory on creep wave are discussed at first.