Apparatus and method for sensing welding point in automatic weld

Details Apparatus and method for sensing welding point in automatic weld Apparatus and method for sensing welding point in automatic weld

1978-07-25

1981-02-03

Shaw, C. C.

Electric heating

Metal heating

By arc

21912422, 21913771, 2191378, 318576, B23K 912

Patent

active

042490626

ABSTRACT:
An automatic welding apparatus comprises a welding torch including an electrode and a fixture for fixing a workpiece, and a relative positional relation of the welding torch and the workpiece fixture is controlled such that the electrode of the welding torch is moved to trace the welding line of the workpiece, whereby automatic welding is achieved. The automatic welding apparatus further comprises a switch for selectively connecting the electrode of the welding torch to a welding power supply or a detecting power supply, and a sensor for sensing a current or a voltage between the electrode and the workpiece when the electrode is switched to the detecting power supply, whereby the relative positional relation between the welding torch and the workpiece is detected in response to the output of the sensor, and thus a welding point or a welding line is sensed. In the case where the automatic welding apparatus is a wire extension type, adapted to successively feed the electrode in accordance with the progress of welding, a collet chuck for clamping the electrode to the welding torch is provided for fixing the length of the electrode from the welding torch on the occasion of the sensing mode.

REFERENCES:
patent: 3567900 (1971-03-01), Nelson et al.
patent: 3934110 (1976-01-01), Denis
patent: 4151395 (1979-04-01), Kushner et al.

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