Development of a Magnetic Flux Controlled-Type Spot-Welding Machine

Abstract

A large number of spot-welding machines are at use in the automotive, home appliance and can-making industries. For example, two steel sheets several mm thick can be welded with a second or two of several kA of current, which supplies the requisite thermal energy. This paper outlines the development of a spot welder utilizing storage batteries as the power supply. Each time the transformer flux level reached a preset ± desired value the polarity of the primary current is switched. Welding current is output continuously until the energy required for welding is developed.