PROCESS FOR PRODUCTION OF METAL O-RING

摘要

A metal O-ring manufacturing method is provided to improve welding accuracy or strength by evenly transmitting electric current in a binding part of a cut surface through contacting the whole outer circumference with electrodes and to enhance welding quality of a metal O-ring binding part by preheating and melting through sequentially adjusting intensity of the electric current. A metal O-ring manufacturing method includes a first step for curving a metal tube(10) circularly(I); a second step for cutting in a certain length(II); a separate electrodes connecting step for dividing the metal tube, cut with a certain length, into a left and right parts by a binding part(10a) between cut surfaces as a partition standard and for contacting the whole outer circumference with separate electrodes of an upper and lower parts, of which distance between positive and negative electrode is from one to one and a fifth times as long as the outer circumference of the metal tube(III); a binding part pressure-adjusting step for tightly combining the cut surfaces of the metal tube to each other by a certain pressure(IV); and a current transmission preheating-welding step for preheating through resistance heat generated at the binding part by laterally sending the same intensity of electric current from each one of the upper and lower electrodes to pass through the binding part of the metal tube(V) and for melt-welding by increasing the intensity of electric current(VI).