天津市内燃机电机厂生产的汽车起动机的磁场绕组(紫铜),过去一直采用浸锡焊工艺进行焊接,焊接接头质量不稳定,容易产生假焊,脱焊等缺陷。而且由于钎料的液相线温度偏低,使起动机的允许工作温度也较低,直接影响了起动机的性能和使用寿命。 In the past, the magnetic field winding (copper) of the automobile starter produced by the internal combustion engine motor plant in Tianjin had been soldered by the immersion soldering process. The quality of the welded joint was unstable and defects such as fake welding and desoldering easily occurred. And because the liquidus temperature of the solder is low, the allowable working temperature of the starter is also lower, which directly affects the performance and service life of the starter.