超厚壁钢管内壁缺陷的超声波探伤方法研究

介绍了用于超厚壁钢管纵向内壁缺陷的超声波探伤方法——变型横波斜射法。探头入射角在小于第一临界角的范围内选择,利用折射纵波斜射到钢管外壁上产生的变型横波检测钢管纵向内壁缺陷。阐述了超厚壁钢管采用该方法探伤时探头入射角的设计、探伤灵敏度的调整及波形判定,并通过Ф121mm×36mm规格钢管的探伤实例验证了此方法的有效性。

Study on Ultrasonic Detection Method for Inner Flaw of Extra-heavy-wall Steel Tube

Elaborated here in the essay is the ultrasonic detection method——the deformed transversal wave angle beam process as used for inner flaw-detecting of extra-heavy-wall steel tube. With the probe incident angle selected within the range smaller than the first critical angle, the refracted longitudinal wave is obliquely shot on the outer surface of the tube to produce deformed transversal wave so as to detect the tube’ s inner longitudinal flaws. Elaborated are the main aspects of the process as being used to detect extra-heavy-wall tube flaw, covering determination of the probe incident angle, adjustment of the detection sensibility, and wave shape discrimination, etc. The effectiveness of the detection process is verified after being actually used to inspect the Ф121 mm×36 mm tubes.