Abstract
This project shows the effect of welding variables on the mechanical properties of C45 steel. This medium carbon steel plate of 10 mm thickness welded using the Metal Inert Gas Welding. Welding current, voltage, root gap are the welding parameters. The hardness and tensile strength of weld specimen are investigated in this study. The results showed that the selected welding parameters had significant effects on the mechanical properties of the welded samples. The welded samples were cut and machined to standard configurations (dog bone sample) for tensile and hardness tests. The selected three input parameters were varied at three levels on the analogy; nine experiments were performed based on L9 array of Taguchi’s methodology, which consist three input parameters. Analysis of variance (ANOVA) was employed to find the levels of significance of input parameters. Root gap has greatest effect on tensile strength followed by welding current and voltage. Voltage has the greatest effect on hardness followed by root gap and welding current. The relative studies of machining performances on the basis of metallurgical properties are properties are prepared by the help of statistical tools, i.e. L9 Orthogonal Array, ANOVA etc.
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