Control method and apparatus for automatic welding machine

Details Control method and apparatus for automatic welding machine Control method and apparatus for automatic welding machine

B - Operations, Transporting

23

K

327/44, 327/71,

B23K 9/12 (2006.01) B23K 11/25 (2006.01)

Patent

CA 1311017

ABSTRACT OF THE DISCLOSURE The present invention provides a control method for an automatic welding machine in which a welding gun is moved by a robot successively to a plurality of welding spots on a workpiece in order to carry out spot welding, said control method compris- ing the steps of detecting with a pair of distance sensors the respective movements of a pair of gun arms of the welding gun; determining from changes in outputs of the respective distance sensors at the time when the welding gun is being opened after completion of the welding at each welding spot whether or not each gun arm has started to move toward its opening side; and operating the robot when it is confirmed that the gun arms have both started moving toward their opening sides.

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