机车油水管路中大量使用了管-管T型接头焊缝，其质量对列车的安全性极为重要。用带人工缺陷的实物试件进行了相控阵超声检测试验，结果表明：相控阵超声检测技术可以检测机车T型管接头焊缝的内部缺陷。相控阵技术有较高的缺陷检出率，检测效率高；工件图像的加载降低了检测人员判定缺陷的难度。

A large number of T-joints are used in the oil-water pipeline of locomotive, whose quality is very important for the safety of train. The results show that the phased array ultrasonic testing technology can detect the internal defects of the T-joint of locomotive. Phased array technology has a high defect detection rate and high detection efficiency; the loading of workpiece image reduces the difficulty of defect detection.