Fig. 1. (a). MIG welding setup, (b). Welded component.
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Abstract: The present paper tells about how to predict and optimize the Metal Inert Gas (MIG) welding of AISI 304 Stainless Steel (AISI 304 SS) work pieces, which are most widely in used in many industrial applications. The powerful tool known as Design of Experiments (DOE) was used to optimize the welding process parameters for effective welding joint of the work pieces. The following welding voltage, welding current and welding speed were considered as input parameters and similarly tensile strength, percentage of elongation, and hardness were considered as performance characteristics for DOE application. The values after experimental measurements, compared with corresponding predicted results of tensile strength, percentage of elongation, and hardness. Moreover, the Taguchi Method was also used for DOE and considered L 27 orthogonal array matrix and Signal-to-Noise Ratio, the tensile strength, percentage of elongation, and hardness of the predicted values have been creditably acquired via Fuzzy representation.
... Read more Related Papers Abstract: The MIG welding parameters are the most important factors affecting the quality, productivity and cost of welding. This paper presents the influence of welding parameters like welding current, welding voltage, welding speed etc. on mechanical properties like tensile strength, hardness etc. on austenitic stainless steel AISI 316. By using DOE method, the parameters can be optimize and having the best parameters combination for target quality. The analysis from DOE method can give the significance of the parameters as it give effect to change of the quality and strength of product or does not. A plan of experiments based on Taguchi technique has been used to acquire the data. An Orthogonal array and analysis of variance (ANOVA) are employed to investigate the welding characteristics of austenitic stainless steel AISI 316 material and optimize the welding parameters. The techniques used for obtaining optimal process parameters with the use of experimental data have been reviewed. The success of MIG welding process in terms of providing weld joints of good quality and high strength depends on the process conditions used in the setup. This research aims to identifying the main factors that have significant effect on weld joint strength.
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Abstract: Welding is a basic manufacturing process for making components or assemblies. Research on welding of materials like steel is still critical and ongoing. Welding input parameters play a very significant role in determining the quality of a weld joint. The gas metal arc welding parameters are the most important factors affecting the quality, productivity and cost of welding in many industrial operations. The aim of this study is to investigate the optimization process parameters for metal inert gas welding for 6mm mild steel plate work piece using Taguchi method to formulate the statistical experimental design using semi-automatic welding machine. Experimental study was conducted at Bishoftu Automotive Engineering Industry, Bishoftu, Ethiopia. This paper presents the influence of three welding parameters (control factors) like welding current (Amp.), wire speed/feed rate (mm/min.), and shielding carbon dioxide gas pressure flow rate (lit./min.) with two different levels for variability in the welding strength. The objective function have been chosen in relation to parameters of metal inert gas welding i.e. final welding quality (better, medium and bad) and minimum number of defects in final products. Eight experimental runs based on an L8 orthogonal array Taguchi method were performed. An orthogonal array, signal-to-noise ratio and analysis of variance are employed to investigate the welding characteristics of mild steel plate and used in order to obtain optimum levels for every input parameter at 95% confidence level. The optimal parameters setting was found is arc strength (A2), wire speed (B1), and gas pressure flow rate (CO2) within the constraints of the production process. Finally the twelve conformations welding tests have been carried out to compare the predicated values with the experimental values confirm its effectiveness in the analysis of weld quality in final products. It is found that welding wire speed has major influence on quality of welded joints. Experimental result for optimum setting gave better quality welding condition than preliminary setting. This study is valuable for different material and thickness variation of welding plate for Ethiopian industries.
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