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Effect of Pulsed Current Micro Plasma Arc welding parameters on Mechanical properties AISI 304 and AISI 430 dissimilar weld joint

G. Uma Maheswara Rao

Abstract


In the present work, two dissimilar AISI 304 and AISI 430 sheets of 0.4mm thick welded using Micro Plasma Arc Welding. Welding input parameters like peak current, base current, pulse rate and pulse width are considered and output responses like fusion zone grain size, hardness and ultimate tensile strength of the welded joint are considered. 31 experiments are performed as per Central Composite Design (CCD) design matrix of Response Surface Method (RSM) by considering four factors and five levels of weld input parameters. Main plots are drawn to understand the variation of output responses with variation of weld input parameters. Mathematical models are developed using MINITAB software considering linear function. Analysis of Variance (ANOVA) is carried out at 95% confidence level. Contour plots are drawn to identify the dominating welding parameter and surface plots are drawn to find the optimal combination of input parameters.

Keywords


Micro Plasma Arc Welding AISI 304; AISI 430; contour plots; surface plots; RSM

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References


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