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

Linus Michael, Stephen Mirando (2012) Comparison On The Microstructure And Hardness Of SMA Welding And GMA Welding Of Dual Phase Steel. Project Report. UTeM, Melaka, Malaysia. (Submitted)

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Abstract

Welding is a technical method to join materials, usually metals by causing coalescence. This is frequently done by melting the work pieces and adding a filler material to form a pool of weld that cools to become a strong joint, with pressure sometimes used with heat, or by itself, to produce the weld.[1]. In industrial, welding may be done in many different surroundings, including open air, under water and in outer space.[2] Arc welding is a type of welding that uses a welding power supply to create an electric arc between an electrode and the base material to melt the metals at the welding point. They can use either direct (DC) or alternating (AC) current, and consumable or non-consumable electrodes. The welding region is usually protected by some type of shielding gas, vapor, and slag. [3] Gas metal arc welding (GMAW), sometimes referred to by its subtypes metal inert gas (MIG) welding , is a semi-automatic or automatic arc welding process in which a uninterrupted and consumable wire electrode and a shielding gas are supplied through a welding gun.[4] Material used in this research is dual phase steel. Dual phase steel (DPS) known as high strength steel that has a ferrite and martensitic microstructure. This results in a microstructure consisting of a soft ferrite matrix containing isolations of martensite as the secondary phase (martensite increases the tensile strength).[5] The failure analysis will be carried out after the joining process. The results from different types of welding will be compared. The objective of this study is to compare the mechanical properties and microstructure analysis between the two types of welding and to make some recommendation for the industry on the best method of welding.

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