A Microprocessor-Based Electrode Movement Controller for Spot Weld Quality Assurance |
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Authors: | Cho Hyung Suck Chun D W |
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Affiliation: | Department of Production Engineering, Korea Advanced Institute of Science and Technology, Seoul, Korea.; |
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Abstract: | Quality assurance has been of a great concern in the process of resistance spot welding, since considerable variation in the weld quality often arises even when the machine variables are held constant. In this paper a new microprocessor-based control method is developed to obtain uniform weld quality regardless of the changing welding environments. The control system utilizes a proportional (P) control algorithm, incorporating with the electrode movement as a feedback variable. The controller generates the welding control current so as to track a desired trace of the electrode movement (reference electrode movement curve) throughout weld cycle. A series of experiments was performed to evaluate the performance of this control method. The results show that, as a result of the electrode movement tracking, weld strengths of all the weldments approach to a desired strength level. |
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