用A型超声波横波斜探头检测焊缝时,超声波声束轴线在检测面处发生折射,工件中缺陷的位置可通过探头的折射角(β)和声程(C)确定,或由缺陷的水平和垂直方向的投影来确定,如图1所示。超声波声程可通过仪器得知,超声波入射到工件中的折射角可通过探头型号和工件材质得知。从图1可见:D=CcosβL=Csinβ When A is used to detect the weld, the axis of the ultrasonic beam is refracted at the detection surface. The position of the defect in the workpiece can be determined by the angle of refraction (β) and sound path (C) of the probe or by the level of the defect And the vertical projection to determine, as shown in Figure 1. Ultrasound sound path through the instrument that the angle of refraction of ultrasound incident on the workpiece by the probe model and the workpiece material that. Can be seen from Figure 1: D = CcosβL = Csinβ