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JWJ > Volume 33(2); 2015 > Article
Journal of Welding and Joining 2015 April;33(2) :69-77.
Published online April 30, 2015.
doi:https://doi.org/10.5781/JWJ.2015.33.2.69
A study on tensile shear characteristics for weld-bonded 1.2GPa grade TRIP steels with changes in nugget diameter for automotive body application
Ildong Choi*, Jiyoun Park*, Jae-Won Kim**, Mun-jin Kang***, Dong-Cheol Kim***, Jun-Ki Kim***, Yeong-Do Park****
*Dept. of Materials Engineering, Korea Maritime and Ocean University, Busan 606-791, Korea
**National Core Research Center (NCRC) for Hybrid Material Solution, Pusan National University, Busan 609-735, Korea
***Advanced Welding & Joining R&D Group, Korea Institute of Industrial Technology, Incheon 406-840, Korea
****Dept. of Advanced Materials Engineering, Dong-Eui University, Busan 614-714, Korea
Correspondence: Yeong-Do Park  Email: ypark@deu.ac.kr
  Published online April 30, 2015
ABSTRACT
High strength steels have been continually being developed to improve in fuel economy in automotive and ensure safety of passengers. New bonding and welding methods have been required for improving weldability on high strength steels. In this study, resistance spot welding and Weld-bond with nugget diameters of 4.0mm, 5.0mm, 6.0mm and 7.0mm were produced and tested, respectively. In order to confirm the effect of nugget diameters on tensile shear characteristic of the Weld-bond, tensile shear characteristics of Weld-bond were compared with those of resistance spot welding and adhesive bonding. Peak load of Weld-bond were increased as the nugget diameter increases. After appearing maximum peak load continuous fracture followed with second peak owing to load being carried by resistance spot weldment. Fracture modes of the adhesive layer in Weld-bond fractures were represented by mixed fracture mode, which are cohesive failure on adhesive part and button failure at resistance spot welds. The results showed that the tensile shear properties can be improved by applying Weld-bond on TRIP steel, and more apparent with nugget diameter higher than 5√t.
Keywords: Weld-bond | Adhesive bonding | Resistance spot weld | Nugget diameter | TRIP steel
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