Study On Mechanical Behaviour Of Resistance Spot-Welding Technology

Sanmugethan , Kuppusamy (2009) Study On Mechanical Behaviour Of Resistance Spot-Welding Technology. Project Report. UTeM, Melaka, Malaysia. (Submitted)

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Abstract

This report described about a project titled “Study on Mechanical Behaviour of Resistance Spot-Welding Technology”. Resistance spot welding is widely used in automotive body assembly compared to other joining technology. Resistance spot weld produce less heat affected zone in workpiece and have greater joining strength. The strength of the spot weld is influenced by many factors such as physical, chemical and mechanical properties of the base metal. An optimized condition of parameters can give good and quality weld joints. The influence of the primary parameters which are welding current and weld time on the tensile shear force and microstructure of the spot weld joint between mild steel and galvanized steel has been investigated in this study. The experiment is conducted to study the effect of the resistance spot welding joining strength by varying the sheet material, sheet metal thickness, weld time and welding current. From the observation two types of fracture mode was found which are separation and tearing types. It was found from the study, increasing current, welding time and material thickness increases the tensile shear strength and hardness value. The presents of porosity did not directly affect the strength of the weld since no initiation of crack in the weld nugget when tensile test are carried out.

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