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0.前言据统计,世界钢产量一半以上是用焊接工艺制成钢制品的。焊接工艺是依靠焊接电源设备来实现的。焊接以电弧焊为主。弧焊已有近百年的历史,早期采用蓄电池作为电源。本世纪20年代初发明的工频
0. Introduction According to statistics, more than half of the world’s steel production is made of steel products by welding process. Welding process is to rely on welding power equipment to achieve. Welding mainly arc welding. Arc welding has been nearly a hundred years of history, the early use of batteries as a power source. The early 20th century invented the power frequency