Optimization of the Tensile Strength of Low Carbon Steel,Weld Joints Using MIG Welding

Wong, Bao Yie (2018) Optimization of the Tensile Strength of Low Carbon Steel,Weld Joints Using MIG Welding. Final Year Project (Bachelor), Tunku Abdul Rahman University College.

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Abstract

As the title of this final year project, this project is to optimize the MIG welding input parameter of low carbon steel welds to increase the tensile strength on the weld joints and metal. Based on the optimization process, a Welding Procedure Specification (WPS) was written using ASME IX format. Welding is the method of joining two parts of material together by melting it with electrode. Welding input parameter was found affect the tensile strength of the base metal and weld joint the most. Therefore, within this project, voltage, current, and welding speed are the three input parameters of welding being investigated. After the experiment and analysis, welding speed found to be the mostly contributed in optimization of tensile strength for both 3mm and 6mm thickness of low carbon steel. Furthermore, Taguchi’s method is the tools used to design the experiment based on this three input parameters. However, MINITAB 18 is a software of analyzing data, therefore, Taguchi’s method is generated using MINITAB 18. Optimum value for each parameters and prediction of the output which is tensile strength were obtained via the software. Two confirmation tests were conducted to verify the prediction of the Taguchi’s method. By comparing the experimental result and the predicted result from MINITAB 18, the percentage different 18 for 3mm and 6mm low carbon steel were 3.15% and 0.47%. Hence, we can conclude that the combination of the optimum value for each welding input parameter can increase the tensile strength of welded low carbon steel most significantly. Hence, based on the result and data, WPS was written so that the quality of welding this two specify metal can be maintained. The WPS was written follow the standard of Section IX of the ASME Boiler and Pressure Vessel Code.