Radiant energy – Photocells; circuits and apparatus – Photocell controls its own optical systems
Patent
1979-11-01
1982-05-04
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Photocell controls its own optical systems
318577, B23K 100
Patent
active
043284167
ABSTRACT:
Apparatus for non-contact tracking of a weld seam to provide lateral position guidance of a welding torch advanced along the weld seam by a traveling carriage utilizes an electromagnetic radiation source for directing an unfocused beam onto the weld seam producing a spatial distribution of reflected electromagnetic radiation having an optical center of power the location of which is functionally related to the lateral position of the welding torch relative to the weld seam, and a lateral cell position sensor for sensing a shift in position of the optical center of power of the reflected electromagnetic radiation spatial distribution. Detection of a shift in position of the optical center of power is utilized as an indication of lateral deviation of the welding torch relative to the weld seam.
The apparatus disclosed further includes signal processing circuitry that develops an electrical signal indicative of welding torch position for input to a torch drive servomechanism. The signal processing circuitry includes noise rejection circuitry to suppress torch light effects on the position sensor and circuitry to reject the RF characteristic of the welding ARC.
REFERENCES:
patent: 3748426 (1973-07-01), Stanley
patent: 3748433 (1973-07-01), Gwin et al.
patent: 3918622 (1975-11-01), Larson
patent: 4145593 (1979-03-01), Merrick et al.
patent: 4158124 (1979-06-01), Connell
patent: 4158161 (1979-06-01), Suzuki
Larson, "Automatic O.D. Bellows Welder Principle and Description", Bailey Belfab (Feb. 4, 1974).
"Seam Tracker Systems", Cyclomatic Industries, Inc. (Feb. 1976).
King et al., "Seam Tracking Systems with the Arc as Sensor".
Dudley Jerry E.
Thornton Carrol G.
Hostetter Darwin R.
J. Ray McDermott & Co. Inc.
Nelms David C.
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