大功率电器开关触头大都采用钨铜与基座铜通过氧——乙炔火焰加热钎焊而成。生产效率较低、产品质量很不稳定、对工人技术要求较高且劳动强度大。近年来国外用钨铜和基座钢连接后做电阻性开关触头,不但降低了成本而且提高了触头强度,值得推广。采用钨铜——钢触头的关键在于解决 Most of the high-power electrical switch contacts using copper and copper base by oxygen - acetylene flame brazing. Lower production efficiency, product quality is very unstable, higher technical requirements for workers and labor-intensive. In recent years, foreign tungsten steel and base steel connected to do after the resistive switch contacts, not only reduce the cost but also improve the contact strength, it is worth promoting. The key to using tungsten-copper-steel contacts is to solve them