This paper reports on the corrosion behavior of aluminum metal inert gas (MIG) welds reinforced with copper powder particles. Pure aluminum, AA1100 sheets, machined to a 45° v‐grooved were used for this experiment. Copper powder particle reinforced samples and unreinforced samples were investigated. The corrosion behavior of the samples were investigated in 3.5 % sodium chloride (NaCl) solution, using the potentiodynamic polarization technique. The results revealed that the corrosion resistance for reinforced samples were higher than those for unreinforced samples. Hence the corrosion resistance of aluminum AA1100 welds can be improved by the addition of copper powder particle in the weld seam, and it is therefore recommended for typical industrial applications.
The need for sustainable materials in engineering applications cannot be overemphasized. Engineering innovation and material manufacturing and processing are now geared towards longevity and safety. Aluminium is one of the few materials that meets the ever-increasing demand for lightweight and high strength materials for various industries, including; aircraft industries, marine, solar panels, automobile, construction companies and many other applications to mention but just a few. Aluminium is known to possess excellent mechanical properties which makes them very useful and desirable. However, the final metallurgical and mechanical properties which characterise the final quality and strength of every weld depends on: (i) the technique employed in the welding of the component together and (ii) the selected process parameters for the welding operation. This work focuses on analysing the effect of heat input as a function of welding current, welding voltage and welding speed on the mechanical and microstructural behaviour of 150 × 100 × 3 mm3 aluminium sheets produced by metal inert gas welding. The parameters were set to represent the low, medium and high heat input values. It is imperative to determine the mechanical properties as a function of the structural integrity of welds to ascertain their functionality and durability for typical applications. Tensile testing, vickers hardness and microstructural examination were performed. The result revealed finer grain structures at lower heat input and more grain deformation and elongation occurring as heat input increases. The hardness property reduces (from 43.57 HV to 39.48 HV in the fusion zone as heat input increases. The width of the weld bead increases (from 328 μm to 496 μm) as heat input increases. However, the selected welding parameters did not greatly influence the tensile properties of the welded joints.
This study investigates a parametric multi-objective optimization of the Tungsten Inert Gas-Metal Inert Gas (TIG-MIG) hybrid welding of AISI 1008 mild steel joints. A combined grey relational system theory and the Taguchi method was used for process optimization towards achieving a set of process parameter that maximizes both ultimate tensile strength and 0.2% yield strength for structural applications. An L-9 orthogonal array based on the Taguchi method was adopted for the experimental design matrix. Grey relational grading system was used to establish a single grade for the responses.Mathematical models for first and second-order regression were developed and optimum process parameters combination that optimizes the response were obtained. From the results, the gas flow rate had the most significant influence on the responses with a percentage contribution of 39.77%. Also, the second-order regression models had a higher coefficient of determination (R 2 ) compared to the firstorder regression for the two responses and thus, represents the best fit for the process. The grey relational grade was improved by 0.0489 through process optimization. The interactive effects of process parameters and their effects on the responses are also illustrated by response surface plots. This study shows the effectiveness of the grey relational grading system in achieving a multi-objective optimization for the TIG-MIG welding process.
Carbon steel is widely used in engineering applications due to its exceptional mechanical properties, and low cost. The fabrication technique employed to weld carbon steel plays a vital role in the final performance of the welded component when put into service. TIG welding is a generally accepted arc welding technique due to its ease and versatility coupled with its capacity to produce high-quality welds. It is the most desirable technique employed for welding plain carbon steel. This work aims to evaluate the influence of TIG welding process parameters on the mechanical and microstructural properties such as tensile strength, hardness, and microstructure of AISI 1008 carbon steel. The process parameters considered in this work were the TIG welding current, and gas flow rate. The tensile testing and the Vickers hardness testing have been carried out for the welded samples. The microstructural investigation was also carried out for the fusion zones (FZ) and the heat-affected zones (HAZ). The test results were analyzed, and emerging properties were compared for the various set of parameters. Welded specimen produced with 140 A, 15 L/mm had the highest hardness value. However, the highest average ultimate tensile strength of 432.89 MPA was produced from process parameters 180 A, 19 L/mm. Finer grain structures were seen in the fusion zones as compared to the heat-affected zones for all selected parameters.
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