Electric heating – Metal heating – By arc
Patent
1987-05-14
1989-02-21
Shaw, Clifford C.
Electric heating
Metal heating
By arc
21913001, B23K 912
Patent
active
048067326
ABSTRACT:
Scanning devices are commonly utilized in conjunction with automatically guided welding systems in order to interpret the location and other characteristics associated with a groove to be welded. Many such systems utilize lasers as a source of radiant energy. The instant invention includes a sensing circuit for detecting radiant energy produced by the arc of a welding torch and producing first and second status signals in response to the respective absence and presence of the arc. A logic circuit produces a first power command signal in response to receiving the first status signal and a second power command signal in response to receiving the second status signal. A radiant energy emitting device controllably produces radiant energy having a first relatively low power level in response to receiving the first power command signal and a second relatively high power level in response to receiving the second power command signal. The radiant energy emitting device is also advantageously maintained at a relatively constant temperature in order to prevent thermal drift of the energy source.
REFERENCES:
patent: 3135857 (1960-01-01), Voros
patent: 4306144 (1981-12-01), Masaki
patent: 4473750 (1984-09-01), Oshida et al.
patent: 4614868 (1986-09-01), Alster
Abshire James B.
Fuhr Peter L.
Caterpillar Inc.
Noe Stephen L.
Shaw Clifford C.
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