Electrical Characteristics of Resistance Welding Tools

Methods of measurement and calculation of resistance welding tools, particularly for the large group of nonstandard type portable welding guns, are contained in this paper. Electrical characteristics have considerable bearing on 1. Kilovolt-amperes at an installation. 2. Required secondary voltage of the welding transformer. 3. Efficiency of the tool. Timesaving means for either measurement or calculation provide accuracies well within the average requirements of the engineer. The approximation calculation of inductance is semiempirical in nature to facilitate computation of tool or cable reactance and can be extended in principle to various types of welding equipment.