Water Immersion Ultrasonic Testing of Macroscopic Inclusions in Steel

In view of the water immersion ultrasonic testing of macroscopic inclusions in steel, the surface compensation methods for sample blocks of different diameters are discussed in this paper. Instead of checking the sensitivity changes of artificial defect in reference blocks, the paper proposed a new method of periodic reviewing corresponding gain change while the amplitude of reflected wave at platform interfaces reaching a certain height. The method can improve the water immersion test efficiency of high frequency ultrasound system.