JWJ > Volume 27(6); 2009 > Article
Journal of KWJS 2009 December;27(6) :36-42.
Published online January 13, 2010.
A Study for Resistance Spot Weldability of Pre-sealed Sheet Steel for Automobile Body by Using Pre-current
Taegyu Park, Sangman Yun, Sehun Rhee


Correspondence:   Published online January 13, 2010
ABSTRACT
  In the present day, new performances are demanded for automobile body steel sheet for example, light weight, durability, resistance corrosion and environmental protection. For an improvement of resistance corrosion, European automobile companies developed pre-sealed steel in 1990’s. Pre-sealed steel have organic coated layer upper zinc coated layer. Evaluating a resistance spot weldability of pre-sealed steel plate is important because resistance spot welding is used mainly in automobile body joining process. In this study, evaluating a weldability of pre-sealed steel plate was carried out using lobe diagram, dynamic resistance and high-speed image. Usually, Pre-sealed steel has poor weldability than GA steel’s. To improve a weldability of pre-sealed steel sheet, pre-current was applied to welding process. Pre-current is applied prior to base-current. In conclusion, the weldability of pre-sealed steel has been improved than GA steel’s by applying pre-current.
Keywords: Dynamic resistance;Lobe diagram;High-speed image;Pre-current;Pre-sealed;Resistance spot welding;Weldability
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