Control system for welding helmet liquid crystal light shutter

Details Control system for welding helmet liquid crystal light shutter Control system for welding helmet liquid crystal light shutter

1979-07-30

1980-12-09

Nerbun, Peter P.

Apparel

Guard or protector

For wearer's head

350332, A61F 906

Patent

active

042375576

ABSTRACT:
A control system and method for operating a welding helmet liquid crystal light shutter wherein opening of the liquid crystal light shutter is delayed by two or three seconds after a welding arc is extinguished to permit the welder to apply a welding electrode to the workpiece after the aforesaid two or three seconds to reheat a rapidly-cooling bead. The invention is particularly adapted for use in welding aluminum wherein it is a common practice to place a short weld at the end of a weld head to prevent rapid chilling of the head. In another embodiment of the invention, a liquid crystal light shutter for a welding helmet is caused to open or become transparent quickly; is held open for a few seconds; and is then closed for a few seconds during which latter time the auxiliary welding bead is applied to prevent rapid chilling.

REFERENCES:
patent: 3821765 (1974-06-01), Wagner et al.
patent: 4039803 (1977-08-01), Harsch

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