油罐焊缝缺陷的超声相控阵检测

超声相控阵技术作为新型的无损检测技术已应用于油罐缺陷检测领域。针对实际焊缝中可能存在的裂纹、气孔、未熔合和未焊透等缺陷，设计制作了包含不同缺陷的焊缝试块。通过设定超声相控阵的声束角度、焦距位置和焦点尺寸等参数，可清晰检测到焊缝内部缺陷，并能较准确地判断内部缺陷的位置和大小。但相控阵技术对被检件表面要求较高，且需要制作多种试块。

Application of Ultrasonic Phased Array on Weld Testing

As a new technology, ultrasonic phased array has been tried to apply in the welds testing. A weld specimen was designed which included the actual defects, such as flaw of crack, air vent, incomplete fusion and incomplete penetration etc. The ultrasonic phased array system can detect the interior defects of welds clearly through controlling the parameter such as beam angle, Focal distance, Focus size and Focus length and so on. It could distinguish the location and the size of the interior defect exactly, The experiment result revealed that phased array technique had high requirement for the testing sur{ace, and needed to make varies sample blocks.