Protection apparatus

Details Protection apparatus Protection apparatus

1981-05-05

1983-11-29

Shaw, C. C.

Electric heating

Metal heating

Weld rod composition

2 8, B23K 932

Patent

active

044182678

ABSTRACT:
An automatic electrically operated protective system protects a welder from harmful light rays and sputtering emanating from the weld zone. An electric circuit controls a light shield means to assume either an open or closed condition. The electric circuit is responsive to the absolute value of the voltage between a welding electrode and a workpiece. A light shield opening signal is produced when this value is smaller than the electrode open circuit voltage but greater than the maximum electrode welding voltage upon ignition of the arc. A light shield closing signal is produced prior to the ignition of an arc when the aforementioned value is greater than the electrode to workpiece short circuit voltage and slightly smaller than the electrode open circuit voltage.

REFERENCES:
patent: 3159844 (1964-12-01), Haboush
patent: 3227866 (1966-01-01), Peters et al.
patent: 3838247 (1974-09-01), Finger et al.
patent: 4241286 (1980-12-01), Gordon

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