Abstract
In present work, the bonded and spot weld-bonded of dissimilar materials joints for three dimensional models using the finite element technique were studied for different adhesive thicknesses. The results show that the stresses in adhesive bonded joints are concentrated at the ends of the overlapped area. When the spot-welding is combined with the adhesive bonding, the stresses are concentrated at the adhesive bond ends and at both ends of the weld nugget. The results show also that the stresses are more concentrated towards the material of the lowest melting point. Changing the thickness of the adhesive layer for various dissimilar material models give us the optimal thickness for each case that one can use in designing lap joints of two dissimilar materials. The results in general show that the thinner the adhesive is, the higher is the peak stresses developed in the weld-bonded joint.
Highlights
Resistance Spot Welding (RSW) has been used for many years as a sheet metal joining process in automotive bodies, aerospace, and other industries applications
Weld-bonded is a combination of resistance spot welding and adhesive bonding, which has gathered wide acceptance as an effective joining process for significant improvement in static, dynamic and impact toughness properties of sheet metal joints. It improves the corrosion and noise resistance as well as stiffness of the joint, over those observed in case of conventional resistance spot welding
Stress concentration and failure modes of a weld-bonded or a spot welded nugget, a finite element modeling does an excellent job in this regard
Summary
Resistance Spot Welding (RSW) has been used for many years as a sheet metal joining process in automotive bodies, aerospace, and other industries applications. It has been widely used because of it is cost effective and easy to operate. Weld-bonded is a combination of resistance spot welding and adhesive bonding, which has gathered wide acceptance as an effective joining process for significant improvement in static, dynamic and impact toughness properties of sheet metal joints. It improves the corrosion and noise resistance as well as stiffness of the joint, over those observed in case of conventional resistance spot welding. He characterized the performance of the adhesive for varying bondline thickness and varying surface preparations
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