Casting of AA 7075 Aluminium Alloy into Gravity Die and Effect of the Die Preheating Temperature on Microstructure and Mechanical Properties

Gökmeşe, Hakan; Bülbül, Şaban; Gök, Onur

doi:10.17559/tv-20200819135453

Cited by 2 publications

(3 citation statements)

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“…Aluminum and aluminum alloys have a high specific strength, high processability, anti-erosion properties, increased conductivity, an eco-friendly nature, and recoverability, and are also characterized by good corrosion resistance [21,22]. Having this in mind, the authors conducted research on the application of the MIG synchropulsed welding process for the welding of AlMg4.5Mn0.7 Al alloys [23,24]. The chemical composition of the AlMg4.5Mn0.7 aluminum alloy used in this experiment is given in Table 1.…”

Section: Methodsmentioning

confidence: 99%

“…The models were tested for the mean squared deviation, for the lack of fit, and for the coefficients of determination, and the obtained data are shown in Table 8. The coefficient of determination R 2 refers to the share of explained variability (the extent of deviation of the regression y from the arithmetic mean) in total variability (the extent of deviation of actual y from the arithmetic mean), and is 0.7539 [23]. A higher value of the coefficient of determination does not necessarily mean that the regression model is good.…”

Section: Output Variable-insufficient/excessive Throat Thicknessmentioning

confidence: 99%

“…It is possible that models with a high coefficient of determination actually poorly assess new values or the arithmetic mean of the response. Since R 2 always increases when new members are added to the model, it is necessary to use the adjusted coefficient of determination R 2 adj , as that value is adjusted to the number of model members in relation to the number of runs, which was 0.7011 in our experiment [23]. Equation ( 2) presents the regression model of the insufficient/excessive throat thickness dependence on the delta wire feed (factor A), frequency (factor B), and duty cycle (factor C) with coded values for factor levels, while Equation ( 3 Figure 3 shows that insufficient/excessive throat thickness in the weld increases when the delta wire feed parameter decreases and the frequency increases when the duty cycle is 26.216%.…”

Section: Output Variable-insufficient/excessive Throat Thicknessmentioning

confidence: 99%

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Optimization of Synchropulsed MIG Welding Process Parameters for Welding of AW 5083 Sheets

et al. 2022

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Metal inert gas (MIG) welding is one of the processes most commonly used for joining metals, especially for joining aluminum and its alloys. The application of a pulsed current in an electric arc allows better controllability of the molten droplets and the arc transition, which subsequently leads to welds with characteristic flaky joints of better quality. In this paper, the optimization of parameters for welding aluminum alloys using the synchropulse welding process is investigated. By observing the input variables that have the greatest influence on the change in appearance of the welding current characteristics (delta wire feed from 0.1 to 6.0 m/min, frequency F from 0.5 to 3 Hz, duty cycle from 10% to 90%), it is possible to perform an optimization to achieve the desired output values. The output variables of the experiments are defined as insufficient/excessive throat thickness (mm), depth of penetration (mm), and weld width (mm); and for the desired quality of the welded joint the most acceptable range of its values is selected, the numerical optimization implementation. The experiment has shown that the delta wire feed has the greatest effect on the observed properties, while the influence of frequency F and duty cycle is somewhat smaller, but the factors responsible for the observed output properties are still significant. From all this, it is possible to select specific values of these input variables to define the best possible observed properties and to determine the characteristics of the defined mathematical models.

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