Automatic welding line tracing method and apparatus

Details Automatic welding line tracing method and apparatus Automatic welding line tracing method and apparatus

1978-06-22

1980-12-30

Shaw, C. C.

Electricity: motive power systems

Positional servo systems

Program- or pattern-controlled systems

21912422, 21912434, 21912512, G05B 1933

Patent

active

042426200

ABSTRACT:
An automatic welding line tracing method and apparatus for causing a welding torch to follow the welding line by using a single non-contact-type sensor for detecting the welding line which is continuously reciprocated to traverse the groove of two pieces to be welded. During the reciprocating motion of the sensor, the sensor generates output voltages E.sub.1 and E.sub.2 respectively obtained by detecting the both ends of the groove to obtain E.sub.1 -.delta. and E.sub.2 -.delta. on the basis of the detected voltages E.sub.1, E.sub.2 and a separately established reference voltage .delta., and an output voltage P.sub.S corresponding to the central position of the groove is obtained from E.sub.1 -.delta. and E.sub.2 -.delta. to thereby compare the voltage P.sub.S with a voltage indicative of the central position of the oscillating motion of the sensor to thereby cause the welding torch to follow the welding line in accordance with the difference between these two voltages.

REFERENCES:
patent: 3268805 (1966-08-01), Normando
patent: 4125943 (1978-11-01), Ando
M. S. L'Vov et al., "Method of Compensating for an Error in Height at Edges of Joint in Tracking Systems . . . " Svar. Proiz, 1967, #9, pp. 42-43.
S. A. Kolyubakin, "An Automatic System for Guiding the Electrode along Butt Joints during Argon Tungsten Arc Welding . . . ", Art. Svarka, 1969, #10, pp. 52-55.
Y. O. Laptenok et al., "A Ferro-Probe Sensor of the Position of the Welding Head Relative to the Join", Svar. Proiz, 1975, #5, pp. 33-35.

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