Electric heating – Metal heating – By arc
Patent
1988-11-14
1990-06-19
Shaw, Clifford C.
Electric heating
Metal heating
By arc
2191251, 219136, B23K 912
Patent
active
049355988
ABSTRACT:
Automatic metal inert-gas-shielded arc welding of such apparatus as large transformer casings with stainless steel welding filler wire fed to the work through a torch from a spool. A series of seam welds are produced on each casing. The torch and spool are mounted on a movable arm of an electrically operated robot. The robot has sensing means responsive to electrical conduction through the work and the wire to position the wire in the correct location for producing each weld. The tip of the wire is oxidized during each weld of the series precluding the electrical conduction necessary to locate the wire for the next weld of the series. In accordance with the disclosure, there is provided a wire cutter displaced from work. After each weld, the robot arm positions the wire in the cutter. This positioning of the wire automatically triggers a proximity switch which actuates a high speed rotary grinder to sever the oxidized tip of the wire. The grinder moves at right angles to the wire cutting the wire squarely so that there is no bend in the resulting end of the wire to militate against accurate location by the sensor for the next weld. The grinder is composed of electrically insulating material and is mounted on an insulated fixture so that it does not shut off the robot by grounding.
REFERENCES:
patent: 4249062 (1981-02-01), Hozumi et al.
ABB Power T&D Company Inc.
Shaw Clifford C.
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