Electric heating – Metal heating – By arc
Patent
1993-06-10
1995-07-11
Shaw, Clifford C.
Electric heating
Metal heating
By arc
21913051, B23K 909
Patent
active
054323177
ABSTRACT:
Increasing the rate of deposition of the molten metal droplets formed on the end of a wire electrode used in a gas-metal-arc welding process by advancing the electrode towards the weld deposit pool during the formation of a molten metal droplet on the end of the electrode, and applying a normal level of current to the electrode. The electrical level is momentarily substantially increased at a time when the individual droplet is almost ready to melt off the end of the electrode for free-flight transfer to the weld deposit pool. The momentarily applied increased current melts off the electrode drop prematurely so that the drop is propelled to the pool. Therefore, although smaller drops are produced than in the normal shielded gas, plasma-type, are welding process, the rate of drop formation and the more rapid separation of the drops and positive propulsion of the drops to the pool, results in substantially increased molten metal deposition in the weld pool.
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