An electronic control circuit for resistance welders

FLEXIBLE electronic control circuits for the precise timing of resistance welders have been utilized thus far primarily on large welders. This paper describes a new circuit using recently developed types of cold-cathode electronic tubes which makes the application of such control economically practicable to small as well as large welders. The advantages of precise timing of welds by electronic means are well recognized, particularly for exact duplication of welds and for fabrication of materials difficult to weld or subject to physical or chemical changes if over-heated. Utilization of the method on small laboratory or industrial welders may render expedient processes that heretofore were considered unavailable except for large-scale production.