Jun Tengfa: Voltage introduction to resistance welding

2022-06-10 0 By

In order to use simple and flexible medium frequency resistance welding, because of its advantages of the same strength with the base material after welding, it is widely used in aerospace manufacturing, hardware technology, automobile container and other different industrial categories.Normal electrical equipment supply voltage does not change with the load, the voltage is constant, such as 380V single-phase or 220V, although the voltage access welding transformer is corresponding, if 380V or 220V, but according to this type of transformer input voltage can be changed with the output current (load) changes,And the voltage is rapidly reduced with the expansion of the load, which is called the steep drop characteristic or the reduction characteristic, which integrates the welding machine required a variety of voltage provisions: 1, primary voltage: because the voltage specified at both ends of the transformer primary coil is single-phase 380V, so the voltage of ac equipment to access the power grid is single-phase 380V.2, zero voltage: in order to ensure that the welding process of frequent short circuit provisions of no-load voltage is about 60-80V, which can smoothly arc, and more personal safety.3, no-load voltage: in order to meet the needs of arc starting and safety, no-load welding, the provisions of no-load voltage about 60-80V, which can smoothly arc, safe use.4, working voltage: after welding arc, the specified voltage can be reduced to the voltage required by the normal operation of the arc, that is, the working voltage, about 20-4-V, this voltage is also safe voltage.5, arc voltage: that is, the voltage at both ends of the arc, this voltage is in the scope of working voltage, welding, the length of the arc will change, the arc length is long, the arc voltage is high, the arc length is short, the arc voltage should be lower, therefore, arc welding transformer should be integrated into the arc length changes to ensure the same arc.