On the Study of a Powerful Spot Welder which is Tentatively Made by Using Electrolytic Condenser to Store and Discharge Energy

Abstract

For the purpose of spot welding of aluminum plate of appreciable thickness, we have made a powerful spot welder using huge electrolytic capacitors (125, 000μF, 500 volts dc.). This welder being 40 KVA in capacity, a constant charging current system with thyratron control is used to minimize the loss due to charging resistor and to shorten the period of charging large capcitance.
Spot welding is carried out in a cycle per two seconds and welding current continues about 0.1 seconds. About 150 KA are used to get sound welds of 4.0 mm, 2S aluminum sheets.