At present, there are two tracking technologies for automatic welding technology, simple mechanical tracking and ray tracking (of course, there are also human eyes tracking, hehe). Mechanical tracking is to install a probe or roller in front of the welding gun and stick it on the inner wall of the breach. When the direction of the breach changes, it is simple and practical to adjust the angle of the welding torch by induction, but the sensitivity is not high. Ray tracing is now popular with infrared and laser tracing, that is, scanning the weld in front of the welding torch (actually scanning the two edges of the breach) and transmitting it to the welding torch to adjust the welding direction. This tracking can adjust a certain delay (that is, the scanning direction changes until the welding gun reaches this position, but the welding gun also changes when the probe mechanism changes, but in fact, the probe is in front of the welding gun, so it becomes early) to make the welding direction change accurately.