Strength Of The Welded Medium Carbon Steel

M. Noorawi, Norliana Izaty (2019) Strength Of The Welded Medium Carbon Steel. Project Report. UTeM, Melaka, Malaysia. (Submitted)

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Abstract

The idea to make this study is when the process of joining steel in various type of industries has been cause discontinuities to happen and this will lead to dangerous consequences. For an example, the use of medium carbon steel in railway application. If this discontinuity happens, the train can slip from the rail and causing danger to the passengers. The objective of this project is to study the effect of welding parameter to the tensile strength of the medium carbon steel. In this study, medium carbon steel type of specimen had been used. The specimens have been cut into half before it can proceed to the welding processes. For the welding processes, Metal Inert Gas (MIG) welding has been used to weld the specimens by three parameters that had been decided to be analyze and after that, the tensile test had been done using the Instron Universal Testing Machine (Model 5969). The parameter that used in this study was decided based on the MIG welding machine that being used which is WIM MIGWeld 210. One of the parameters is the weld joint. Different weld joint being tested to identify the most suitable weld joint to get the optimum tensile strength. The different weld joint includes the single transverse fillet, double transverse fillet and square butt where at the end of this study, it is proved that double transverse fillet weld joint gives the optimum tensile strength. The next parameter used is the welding feed speed. Three different welding feed speed is chosen which are 8.5 m/min, 10.2 m/min ad 11.9 m/min respectively. From the tensile test, it is concluded that, the higher the value of the welding feed speed, the higher the tensile strength of the material. Lastly, the parameter of welding voltage also used in this study where voltage of 223.3 V, 226.6 V and 229.9 V is applied and the result shows that the low voltage give better tensile strength for the medium carbon steel.

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