Electric heating – Metal heating – By arc
Patent
1988-12-30
1991-05-14
Albritton, C. L.
Electric heating
Metal heating
By arc
21912184, B23K 2600
Patent
active
050158180
ABSTRACT:
A magnetic collector disposed about the nozzle of a laser used for welding and severing a steel foil tension mask (FTM) in a color cathode ray tube (CRT) removes debris produced during laser welding and cutting. A plurality of magnets are mounted to a soft iron ring disposed about the laser beam exit aperture and are positioned in close proximity to the FTM and its support rail during laser welding and cutting. The magnets may be arranged with like poles disposed about the laser beam exit aperture or with the magnetic poles arranged in an alternating manner, which latter arrangement provides somewhat broader magnetic field coverage, for collecting and preventing small metallic particles produced during welding and cutting from becoming attached to and obstructing the apertures in the FTM.
REFERENCES:
patent: 3626145 (1971-12-01), Jackson
patent: 3701881 (1972-10-01), Rother et al.
patent: 4447701 (1984-05-01), Brown
Albritton C. L.
Zenith Electronics Corporation
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