Significant Effect Of Different Base Metal Sheet Spot Welding

Mat Zainu Zaman, Mohamad Rafiezi (2016) Significant Effect Of Different Base Metal Sheet Spot Welding. Project Report. UTeM, Melaka, Malaysia. (Submitted)

Text (24 Pages) Significant Effect Of Different Base Metal Sheet Spot Welding.pdf - Submitted Version Download (294kB)

Abstract

Spot welding is one of the metal joining processes that mainly used in automotive industries. Resistance spot welding of different base metal sheet generally more challenging than same base metal sheet due to several interfaces. The strength of vehicle structure mostly depends on the weld structure. Thus, this project intended to study the mechanical properties of different base metal between high strength steel metal sheet and regular cold roll metal sheet. The parameter of resistance spot welding such as welding current, welding force, and welding time were fixed at a constant value. In this project, the tensile strength and hardness test of lap joint in spot welding for 1.40 mm thickness of two layer welded sheet was investigated. The testing process that had been done is tensile shear-test by using Universal Testing Machine, hardness test by using Hardness Testing machine, and surface microstructure by Scanning Electron Microscopy. By the results obtained in this project, SPCC BM have high tensile strength and low hardness because the level of ductility in SPCC BM is more higher compared to HSS BM. Results have shown that the combination of HSS base metal is better than from SPCC base metal in resistance spot welding. The results of this study found, spot welding for SPCC base metal should be reduced for improve quality at body frame car.

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