对比了相控阵超声和常规超声对接焊缝的检测仿真和试验，分析了对接焊缝相控阵超声检测的可靠性，为承压设备相控阵超声检测标准的制订提供相应参考。仿真与试验得出：相控阵超声检测的缺陷检出率总体上要高于常规超声检测。对于有着严重危害且对声束指向性要求较高的面状缺陷，相控阵超声的检出率要高于常规超声。对于夹渣、 未焊透等体积性缺陷，相控阵与常规超声的检出率均非常高。但是对于气孔类回波较小的体积性缺陷，相控阵超声的检出率明显高于常规超声。对于工件厚度较大的焊缝，相控阵超声较常规超声技术可以扫描检测到更厚的焊缝区域。在缺陷测长方面，相控阵超声的测长结果相对于常规超声技术总体偏大，测长精度并无明显优势。

The reliability of ultrasonic phased array for butt weld is analyzed to provide references for the ultrasonic phased array inspection standard by comparison with conventional ultrasonic inspection. Simulations and experiments showed that, the defect detecting rate of phased ultrasonic testing method is higher than general ultrasonic testing method in totally. For the seriously hazardous defects and also plane defects with highly ultrasonic beam direction, phased ultrasonic testing can get a higher detective rate than general ultrasonic testing. For the voluminal defects such as slag inclusion, incomplete fusion and so on, there is a high detecting rate for both phased ultrasonic and general ultrasonic testing. But for the small voluminal defect such as porosity, phased ultrasonic testing can get a higher detecting rate than general ultrasonic testing method. For the thick weld seam, using phased ultrasonic testing method can scan the deeper depth of the seam than general ultrasonic testing. For the defect length measurement, phased ultrasonic testing get a longer defect size than general ultrasonic testing method, therefore there is no obvious advantage on the size measuring accuracy for phase ultrasonic testing than general ultrasonic testing method.