Welding machine with automatic seam tracking

Details Welding machine with automatic seam tracking Welding machine with automatic seam tracking

1984-03-12

1986-02-18

Shaw, Clifford C.

Electric heating

Metal heating

By arc

318576, 318653, B23K 912

Patent

active

045714797

ABSTRACT:
An automatic tracking welding machine includes a pair of rotatably mounted sensors 6a, 6b disposed in advance of a welding torch 3 and coaxial therewith for detecting magnetic leakage flux across a weld line gap 10. The sensors are driven to equalize their outputs by a reversible stepping motor 15 supplied with drive pulses whose frequency is proportional to the sensor output difference up to a fixed limit, thereby implementing slowdown as the center or zero differential point is approached. Alternatively, a greater number of fixed sensors may be peripherally spaced around the torch housing and their outputs sequentially scanned and peak detected to track the weld line gap. In another embodiment a spaced pair of sensors 116a, 116b is laterally and bidirectionally driven by a reversible d.c. motor 123 supplied with a voltage proportional to the off-center distance detected by the sensors, thus also implementing slowdown as the zero point approaches. Hall effect sensor elements encased in a non-magnetic metal housing may be used to avoid sputtering damage. A single leakage flux sensor may also be employed and periodically scanned laterally across the weld line gap, whereby a peak or zero slope in its output would indicate centering.

REFERENCES:
patent: 3268805 (1966-08-01), Normando
patent: 3482644 (1969-12-01), Krieger et al.
patent: 3484667 (1969-12-01), Wofsey
patent: 4124792 (1978-11-01), Flora et al.
patent: 4206391 (1980-06-01), Varacins
patent: 4215299 (1980-07-01), Edwin et al.
patent: 4441010 (1984-04-01), Cornu et al.

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