一、概述薄壁管对接焊缝的根部焊接,容易出现各种类型缺陷。当用超声波进行检测时,由于根部及其附近几何形状较复杂,超声波的近场干扰对判伤亦有很大影响。因而,薄壁管对接焊缝根部及内部缺陷如何探测及评定,成为超声波检测技术在实际应用中的一个重要问题。本文通过理论及实际验证,提出薄壁管对接焊缝超声波检测及评定方法,供参考。二、原理和方法 First, an overview of the thin-walled butt weld root welding, prone to various types of defects. When using ultrasonic testing, due to the complexity of the root and its vicinity, ultrasonic near-field interference also has a significant impact on the injury. Therefore, the thin-walled butt weld root and internal defects how to detect and assess the ultrasonic testing technology has become an important issue in practical applications. In this paper, theoretical and practical verification, proposed thin-walled butt weld ultrasonic testing and evaluation methods for reference. Second, the principle and method