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1.对焊接电源的基本要求(1)有适当的空载电压直流电源空载电压为55—90伏,交流电源为60—80伏,空载电压过高,有利于电子发射,引燃电弧容易,但不安全,耗铜多。(2)有合适的外特性电源外特性——焊接电源输出电压与输出电流之间的关系。电源外特性的种类有下降特性、平特性、上升特性三种。随着输出电流增大,输出电压下降超过7伏/100安者称为下降外特性。根据下降特性的下降程度,还可分为缓
1. The basic requirements of the welding power supply (1) a suitable no-load voltage DC power supply no-load voltage of 55-90 V, AC power of 60-80 V, no-load voltage is too high, is conducive to electronic emission, ignition arc Easy, but unsafe, consuming copper. (2) Suitable external characteristics External characteristics of the power supply - the relationship between the output voltage of the welding power supply and the output current. The characteristics of the power supply characteristics of the decline, flat, rising characteristics of three. As the output current increases, the output voltage drops by more than 7 volts / 100 amps and is referred to as falling external characteristics. According to the decline in the degree of decline, but also can be divided into slow