厚壁钢管探伤原理及自动探伤系统研制

对于厚径比〉0.2的厚壁钢管，无法同时实现纯横波探伤与内壁探伤。为此，通过对厚壁钢管探伤原理的分析，计算得出了横、纵波同时探伤时纵波与内壁相切以及横波与内壁相切时的超声波入射角表达式，以及四种规格钢管所对应的水中的声程及焦距。由此实现了同时利用纵、横波对厚壁钢管的探伤。基于理论分析，设计了厚壁钢管自动探伤系统，实现了厚壁钢管的快速自动化探伤。

Detecting Principle and System Design of Thick Wall Steel Pipe

The shear and longitudinal wave detection can not be realized simultaneously in the thick wall steel pipe, whose ratio of thickness and radius is more than O. 2. Aiming at this problem, through the analysis to the detecting principle of thickwall steel pipe, the ultrasonic wave incident angle was calculated, when the shear and longitudinal wave was tangent with internal wall respectively. The acoustic distance and focal distance in the water were determined as well. Thus the detection to the thickwall steel pipe was realized. Based on the theory, a detecting machine was designed to realize automatic and high speed detection to the thick wall steel pipe.