The detection condition of the welding toe crack of slide block in superheater and reheater tube of power station boiler is complicate

which makes the detection very difficult. To solve this problem

on the basis of analyzing the formation mechanism of welding toe crack of superheater and reheater tube

the crawling wave detection probe and block as well as the technology are developed by using the crawling wave detection technology. Moreover

the welding toe crack of a boiler slide block was tested

the results show that

the 5 P(9×16)×2 climb wave probe has good identification effect on boiler tube(Φ50.8 mm×8.5 mm) slider weld toe crack detection

and the detection rate is high. This creep wave detection method is simple

flexible and suitable for the detection environment with complex working conditions on site. The crack reflection wave is easy to be identified and the undetectable area of the slide toe crack is eliminated.