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Journal of KWJS 2009;27(1):102-107.
Published online March 12, 2009.
A Study on Servo DC Resistance Spot Welding of Mg Alloy Sheet(1)
SunNyeo Jung, HeeSeok Chang, Mok-Young Lee
  Weldability of Mg alloy was investigated using servo-actuated DC resistance spot welder. Due to its uncommon electrical and mechanical properties, lots of voids and cracks were observed inside nugget with conventional weld schedule. Lobe curve was proposed to clarify proper electrode force and weld current, which guarantee reasonable weld strength and fatigue life. Macro structure of sectioned specimen was examined to count total number of void and crack. Post weld schedule is also proposed to reduce micro vickers hardness value of weld zone.
Key Words: Mg alloy, Servo-actuated resistance Spot welder, Lobe curve, Dynamic resistance

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