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Mixed Mode Control of Constant Power and Constant Current for Resistance Spot Welder using Dynamic Resistance Characteristics
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 Title & Authors
Mixed Mode Control of Constant Power and Constant Current for Resistance Spot Welder using Dynamic Resistance Characteristics
Kang, Sung-Kwan; Jung, Jae-Hun; Nho, Eui-Cheol;
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A new mixed mode control of constant power and constant current for resistance spot welding inverter is proposed to improve the weld quality. The conventional control scheme adopts constant current or constant power control mode, however, it is not easy to guarantee the high weld quality because of the nonlinear resistance characteristics of the welding point. The proposed method utilizes the nonlinear characteristics by measuring the dynamic resistance in real time. Therefore, it is possible for the welder to be controlled adaptively depending on the welding state. Experimental results show that the proposed control scheme improves the weld quality by 6.8 times compared with the conventional constant current mode control.
Dynamic resistance characteristics;Weld quality;Constant current and power control;
 Cited by
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