earthing

The too high impact direct current high pressure may reduce the resistance of trouble point too fast, even turn into a metalline earthing trouble, thus bring the trouble to appointed work.

过高的冲击直流高压可能会将故障点电阻降低太快，甚至变成金属性故障，从而给定点工作带来麻烦。

For instance, you should make sure that the insulations between the soldering tweezers and welding cable are ok and the earthing point and each termipoint of soldering machine are in good condition.

如焊钳和焊电缆的绝缘是否有损坏的方，焊机的外壳和焊机的各线点触是否良好。