Abstract
Gas metal arc welding is one of the arc fusion processes that is widely used in industry due to its high efficiency. The correct selection of the input parameters has direct influence on the weld quality and, with the control of those parameters, it is possible to reduce the amount of weld material, improve its properties and then increase the productivity of the process. This study intends to take a group of weld parameters and submit them to the optimization by the Taguchi Method and check the influence of those through a Variance Analysis (ANOVA). An L9 orthogonal array gathered three parameters (weld voltage, weld speed and weld torch angle) into three levels, then, with all combinations set and performed, the macrography and the transversal tensile strength test provided, respectively, the geometrical and the mechanical properties. The signal-to-noise ratios enable the optimization and the ANOVA provided the influence of the input parameters on the response parameters. The weld speed appeared as the most influent parameter for the weld geometry, contributing 63.54% to reinforcement, 66.36% to width and 66.94% to penetration, and the weld torch angle the most influent to the ultimate transversal tensile strength (41.39%). The optimum levels to the reinforcement are 22.4 [V], 400 [mm/min] and 30 [°], to the width 22.4 [V], 300 [mm/min], 0 [°], to the penetration 23.3 [V], 400 [mm/min], 0 [°] and, lastly, to the ultimate transversal tensile strength 24.1 [V], 200 [mm/min], 15 [°]. The Taguchi method showed to be suitable for this kind of problem and giving an efficient experiment design and good results.
 Keywords: Taguchi method, Optimization, GMAW
Highlights
The Gas Metal Arc Welding (GMAW) is a weld procedure that follows the industry development since the 20th century
Steel wire electrodes with 0.8 [mm] diameter were used to make welding deposits over a plate top joint with an experimental apparatus controlled by numerical commands used with a GMAW machine that can adjust to the desirable weld input parameters
The Taguchi method is presented to perform a welding GMAW experiment and optimize the process based on the weld parameters
Summary
The Gas Metal Arc Welding (GMAW) is a weld procedure that follows the industry development since the 20th century. This kind of process was created to reach high production levels due to advantages such as high reliability, all position capability, low cost, high deposition rate, ease of use, absence of fluxes, cleanliness and ease of. Manuel Braz-César, and João Ribeiro, (2020), “Optimization and Influence of GMAW Parameters for Weld Geometrical and Mechanical Properties Using the Taguchi Method and Variance Analysis” in International Congress Page 781 on Engineering — Engineering for Evolution, KnE Engineering, pages 781–794. This material provides high productivity with low manufacturing costs, great weldability and, high-strength steels can provide a better weight to strength ratio [2]
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