Method and system for reducing spatter in short-circuit...

Details Method and system for reducing spatter in short-circuit... Method and system for reducing spatter in short-circuit...

2007-09-04

2007-09-04

Shaw, Clifford C. (Department: 1725)

Electric heating

Metal heating

By arc

C219S130210

Reexamination Certificate

active

10571801

ABSTRACT:
A method for reducing spatter in the short-circuit transfer gas shielded arc welding is disclosed. In this method, the resistance changing rate or the impedance changing rate of the welding circuit loop is detected for estimating the diameter of the short-circuit liquid bridge. When the diameter of the short-circuit liquid bridge shrinks to the preset value, the short-circuit bridge current is bypassed or shunted by the current closed loop feedback bypass control, and the current is decreased to a very low level rapidly and maintained this level until the bridge is broken, which results in a gentle and smooth drop transfer in a low current level condition, so as to avoid the mass spatter. Furthermore, a system for performing the method has also been disclosed.

REFERENCES:
patent: 4546234 (1985-10-01), Ogasawara et al.
patent: 4835360 (1989-05-01), Parks et al.
patent: 6906284 (2005-06-01), Kim et al.
patent: 59-199173 (1983-04-01), None

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