有时一条焊缝的破裂就能引起整个系统的失效。当机械力超过设计限度或者焊接处理控制不当时,发生焊缝破裂又是常事。这两种情况在系统总装之前,进行电气测试就能检测出来。四点法(或叫四探头法)电阻测量技术能够用来检测金属片交迭焊缝的质量(图1)。直流电源的输出和回流引线接在焊缝边的一个连接片上,这样,电流通路 Sometimes a broken weld can cause the entire system to fail. When the mechanical force exceeds the design limit or the welding process is not properly controlled, the occurrence of weld cracking is common. In both cases before the system assembly, electrical testing can be detected. The four-point method (or quadrupole method) resistance measurement technology can be used to detect the quality of overlapped metal sheets (Figure 1). DC power output and return lead connected to the weld edge of a connecting piece, so that the current path