APPARATUS FOR WELDING A CONDUCTOR THROUGH COLD FLOWABLE INSULATION
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Abstract
A CONDUCTOR, SURROUNDED WITH COLD FLOWABLE INSULATION, IS WELDED TO A TERMINAL PIN, E.G., BY ENGAGING THE CONDUCTOR AND THE PIN BETWEEN A PAIR UNHEATED WELDING ELECTRODES. THE ELECTRODES ARE URGED TOGETHER WITH A FORCE WHICH REACHES A VALUE GREATER THAN A DESIRED WELDING FORCE VALUE AND IS SUFFICIENT TO CAUSE THE INSULATION TO UNDERGO COLD FLOW OUT OF A PATH BETWEEN THE ELECTODES VIA THE CONDUCTOR AND THE PIN, THEREBY TO RENDER THE PATH CONDUCTIVE. THE FORCE APPLIED TO THE ELECTRODES IS THEN DECREASED TO THE DESIRED WELDING FORCE VALUE AND A PULSE OF WELDING CURRENT IS PASSED ALONG THE CONDUCTIVE PATH WHEN THE DESIRED FORCED VALUE IS ACHIEVED. THE CURRENT PULSE IS APPLIED AS THE FORCE APPLIED TO THE ELECTRODES DECEASES AND IN COMPLETED, AND THE MOLTEN METAL FORMED BY THE CURRENT PULSE IS SOLIDIFIED, BEFORE SUCH FORCE IS COMPLETELEY REMOVED. THE CONDUCTOR IS SUPPLIED THROUGH A PASSAGE FORMED IN ONE OF THE ELECTRODES.
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