Parameter-properties relationship of thin plate welding by ColdArc technology

Ayob, Muhammed Syameel (2017) Parameter-properties relationship of thin plate welding by ColdArc technology. Project Report. Universiti Teknikal Malaysia Melaka, Melaka, Malaysia. (Submitted)

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Abstract

The purpose of this study was to understand the parameter-properties relationship of thin plate welding with dissimilar thickness by “ColdArc” welding. This welding was conducted by automated gas metal arc welding (GMAW). The GMAW welding process performed by using ER70S-6 filler wire. The specimen was welded by using different parameters of welding. The set of parameters was designed by Minitab 16. Specimen of lap joint with dissimilar thickness were studied by analyzing the tensile properties, microhardness properties and weld bead dimension. Tensile test, Vickers microhardness test and weld bead dimension were conducted. The combinations of welding voltage, welding current, and welding speed in which can form the heat input of the process were employed in this study. Tensile testing and microhardness properties were then compared. Furthermore, data was analyzed by using Taguchi method to suggest an optimization of welding parameter for thin plate welding by “ColdArc” technology. The result showed that the highest strength that was 241.7MPa was obtained when welding current, welding voltage and speed were at 70V, 17.6A and 0.6mm/min, respectively. In addition, the highest hardness was obtained at 229.6HV when 75A welding current, 7.5V welding voltage and 0.8mm/min welding speed were used.

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