Comparison On The Microstructure And Hardness Of GTA Welding And GMA Welding Of Dual Phase Steel

Kejanindran, Govindarajoo (2012) Comparison On The Microstructure And Hardness Of GTA Welding And GMA Welding Of Dual Phase Steel. Project Report. UTeM, Melaka, Malaysia. (Submitted)

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Abstract

Welding is a process that is used in industry to join two pieces of metal by the application of heat. The main objective of this study is to compare the hardness of weldment produced by using Gas Tungsten Arc Welding (GTAW) and Gas Metal Arc Welding (GMAW). The specimen that will be used in the experiment is dual phase steel. Dual phase steel is a type of steel that offers combination high strength and ductility as a result from heat treatment that consists of hard martensitic microstructure and soft ferritic microstructure. The dual phase steel is obtained through heat treatment process by using low carbon steel or called as mild steel. This mild steel is placed in the furnace at 740 °C for 40 minutes and by using the quenching technique, dual phase steel will be produced. The specimen then will undergo welding process which will be GTAW and GMAW. Only one type of joints will be produced using these welding. It is butt joint. The strength of weldment will be tested using Rockwell hardness test and the microstructure will be analyzed under optical microscope to determine the best joint produced from these two types of welding.

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