由于铜的贵重而稀缺,所以用铝代铜在很多国家引起了重视。在电气工业中以铝代铜是一个发展方向,它所以未能早日推广的原因,主要是由于铝接头表面容易氧化,接触电阻很快增加。因此,在铝端头焊接一段铜,成了解决这个问题的主要方法之一。但是用一般铜 Due to the preciousness and scarcity of copper, the use of aluminum for copper has drawn much attention in many countries. In the electrical industry, copper on aluminum is a development direction. Therefore, the reason for its failure to be popularized at an early date is that the surface of the aluminum joint is easily oxidized and the contact resistance rapidly increases. Therefore, welding a piece of copper on the aluminum tip has become one of the main ways to solve this problem. But with normal copper