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JWJ > Volume 24(6); 2006 > Article
Journal of KWJS 2006 December;24(6) :13-20.
Published online February 12, 2007.
A Study for the Improvement of Weld Quality Through Force Control of Servo Gun in Resistance Spot Welding using Robot
YoungWhan Park, Jonggu Lee, Sehun Rhee


Correspondence:   Published online February 12, 2007
ABSTRACT
  Resistance spot welding is widely used for joining sheet metals in the automotive manufacturing process. Recently, servo-gun is used to increase the productivity and precise control the acting force. However, force control mechanisms have not been investigated with servo-guns until now. In this paper, it is proved that servo-motor current is proportional to torque and by experiment, experimental equation between servo-motor current and electrode force was derived. Algorithm for feedback control of electrode force was suggested using current measurement. In addition, applying soft touch method to this system the impact between electrode and specimen, which is the problem of air gun, could be reduced. Indentation made the force decrease in holding time of resistance spot welding. In order to overcome this problem, force compensation using the servo gun was used and it improved weld strength in good welding current range.
Keywords: Resistance spot welding;Servo-gun;Servo-motor;Feedback current;Current transformer;LVDT sensor
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