The Study Of E6013 Electrode Effect On Microstructure Of Difference Mild Steel Thickness By Using Arc Welding

Abdul Hayyan, Abdul Halim (2010) The Study Of E6013 Electrode Effect On Microstructure Of Difference Mild Steel Thickness By Using Arc Welding. Project Report. UTeM, Melaka, Malaysia. (Submitted)

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Abstract

The research work conducted in this dissertation aims to evaluate mechanical properties (Hardness) and analysis Heat Affected Zone (HAZ)of mild steel A36 weldment. Here the welding was conducted based on three different thicknesses of specimen. The sizes are 4mm, 6mm and 8mm respectively. The arc voltage used consists of same value and the current flow for Shielded Metal Arc Welding (SMAW) was set the different values of 70A ~ 120A in range. Meanwhile the electrodes diameter for E6013 is 1/8in (3.1mm). The experiment started with preparing the specimen by welding process using SMAW welding equipment. The concentration initial is on preparing the plate specimen (total 9 specimens of different thickness) by cutting them into pieces of 120mm x 60mm. Response Surface Methodology was applied only research design and data analysis for hardness variation of weldment and HAZ. This investigation is used the advantages of manipulating the system as interrelation between the parameters of response to conduct experiment to get the highest of hardness result by calculating using software. Therefore, these experiments not cover the specific mathematical model, confirmation and the standard method for the analysis. The relations then were compared with weldment hardness variation and microstructure using Image Analyzer that showed the transformation ferrite + pearlite to austenite at HAZ created a hard and brittle structure near the fusion zone. The result revealed that different current and thickness size applied could enforce the austenitic mild steel structure to an increasing strength in hardness and changes in microstructural contains.

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