Method and apparatus for controlling electrical resistance spot

Electric heating – Metal heating – For bonding with pressure

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B23J 1124

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active

052548287

ABSTRACT:
Electrical resistance spot welding is controlled by stopping the welding current upon detection of indentation of the work pieces by the electrodes. Indentation is detected indirectly by monitoring the deformation on at least one arm supporting an electrode. The piston of the welding gun cylinder is prevented from displacing in direct proportion to displacements of the electrodes during formation of the weld so that the squeezing force applied by the electrodes to the work piece, and therefore the deformation in the electrode holders, varies as a function of electrode displacements.

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Monitoring and Control of Spot Weld Operations (SAE Technical Paper Series), SAE the Engineering Resource for Advanced Mobility, by A. Stiebel et al, Feb. 24-28, 1986.

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