Coating effect on the resistance spot welding (RSW)
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Date
2019-05
Authors
Nur Salsabila Binti Mohd Khairul Nizam
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Abstract
Resistance Spot Welding (RSW) is a process of material joining that recently been
widely used in industry such as aerospace and automotive industry. There has many
research done on discussing about the effect of welding parameter and coated material
toward the properties and behavior of spot welded joint. This research is focusing on the
coating effect on the RSW plus with the constant parameter that being applied toward the
sample which are consist of similar and dissimilar joint combinations. The coating material
involve is galvanized iron and nickel coated where nickel is being studied in term of the
plating time parameter so that it will be deposited via electroplating on the mild steel.
While for RSW parameter being applied are constant which consist of weld current with 7
kA, weld time with 50 ms and pressure with 37 N. Material characterizations that involve
in this project were tensile shear strength, hardness and welding morphology using optical
microscope, tensile test machine, Vickers micro hardness, stereo zoom microscope,
scanning electron microscope (SEM). The result of the experimental studies shows that
similar coated combination joint of galvanized iron (GI) have the bigger value of weld
nugget lead to higher value of tensile shear strength and lower value of hardness. This may
happen because of the GI properties where its consists of lower electrical resistivity and
higher thermal conductivity compare other coated and uncoated material.