汽车工业中用到点焊的地方非常多。在使用超声波探伤无损检验点焊质量以前,只能用人工的方法做破坏试验。以汽车保险杠为例,必须把二十件或更多的样品拉到试验室,将焊点锯开,再测量焊点的大小和深度,每试验一次要三小时以上。找到焊接缺陷以后,整批工件或许有几千件都得废弃掉,再重新调整焊接参数。即使找不出缺陷,已锯开的试件也被破坏了,这是一种少慢差费的做法。相反,点焊的超声波试验既快又简单,只需把合适的探头放在焊点上,观察探伤仪荧光屏上的反射波形,比较三种典型的曲线,从而就可判断出点焊 There are many spot welding applications in the automotive industry. In the use of ultrasonic testing non-destructive testing spot welding quality, only the artificial method of doing damage test. Take a car bumper, for example, you have to pull twenty or more samples into the lab, saw out the solder joints, and measure the size and depth of the solder joints. Each test takes more than three hours. After finding a welding defect, the entire batch of workpieces may have to be discarded thousands of pieces, and then re-adjust the welding parameters. Even if the defect can not be found, the sawed specimen has also been destroyed, which is a less-than-fee approach. On the contrary, the spot welding ultrasonic test fast and easy, just put the appropriate probe on the solder joint, observe the flaw detector screen reflection waveform comparison of three typical curves, which can determine the spot welding