本文结合超声波探伤的基本原理和现场超声波探伤工作中的具体情况,对钢结构桁架现场施工焊缝中常见缺陷的产生原因及防止措施进行了分析,并简要介绍了相贯线焊缝的超声波探伤。 Based on the basic principles of ultrasonic flaw detection and on-site ultrasonic flaw detection, this paper analyzes the causes and preventive measures of common defects in on-site construction of steel truss structures and introduces the ultrasonic flaw detection of the intersecting line weld .