Spot welding machine

TLDR: In this paper, the conductive wire 42 coated with the synthetic resin film 42b to be removed by melting with heating, for instance, and the terminal member 44 to connect it are superposed between the 1st electrode 20, 3rd electrode 22 and the 2nd electrode 21 to pinch it.

Abstract: PURPOSE:To weld a terminal, etc., without executing special prerepair on the conductive wire coated with the heat resistant synthetic resin of an esterimido, etc., by setting the electric resistant value of 1st and 3rd electrodes at higher value than that of a 2nd electrode. CONSTITUTION:The conductive wire 42 coated with the synthetic resin film 42b to be removed by melting with heating, for instance, and the terminal member 44 to connect it are superposed between the 1st electrode 20, 3rd electrode 22 and the 2nd electrode 21 to pinch it. With starting of electrification thereafter, a current is first passed through the route of the 3rd electrode 22 from the 1st electrode 20 by being blocked by the synthetic resin coating film 42b. At this time, the 1st electrode 20 and 3rd electrode 22 having high electric resistant value become in high temp. instantaneously with heat generation to melt the synthetic resin film 42b. With this melting, the electric insulation is destroyed and the current is passed toward the 3rd electrode 22 from the 1st electrode 20 to enable work welding.