Effect of direct metal deposition of stainless steel 308 LSi wire on stainless steel 304 base plate

Mohd Nizam, Mohd Syazwan (2017) Effect of direct metal deposition of stainless steel 308 LSi wire on stainless steel 304 base plate. Project Report. Universiti Teknikal Malaysia Melaka, Melaka, Malaysia. (Submitted)

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Abstract

An experimental research titled “Effect of Direct Metal Deposition of Stainless Steel 308 LSi Wire on Stainless Steel 304 Base Plate” is studied. The aim of this study is to investigate how parameters of deposition affecting microstructure, weld dimension and microhardness of stainless steel deposited material. The metal deposition process had been conducted using robotic tungsten inert gas (TIG) welding method. Background knowledge of metal deposition including welding, heat source, materials and its commercial application in relation to metal deposition process, process parameters, microstructure properties, weld dimension and hardness variation were also reviewed. The experimental method involving manipulating two factors (metal deposition parameters which are welding current and welding speed) to determine if changes in these variables causes change towards the responses (microhardness value and weld bead height). This method relies on Design of Experiment (DOE) by using Response Surface Methodology (RSM) and the process is based on Central Composite Designs (CCD) in order to achieve optimization of parameters while conducting this experimental research. Then, it was proved that when using high heat input, it resulted to higher weld bead height when current (120 Ampere) and speed (50 mm/min) had been setup. As for microhardness, low heat input resulting a better performance of microhardness when current (135 Ampere) and speed (170.71 mm/min) were setup. Besides that, microhardness variation which was indented at the deposited material, HAZ and base metal were discussed. The average microhardness value showed that the microhardness value increases from deposited material to base metal. It is also concluded that the welding speed contributes the most significant factor for weld bead height, while welding current contributes the most significant factor for microhardness.

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