التأثيرات الحرارية لمعدن على شكل سلك مزدوج يعتمد على MIG باستخدام تقنية الترسيب
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2022-12-12
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A more recent additive layered manufacturing method is shaped metal deposition (SMD). The use of a heat source like a beam of an electron, laser, or electric arc and metal wire is a unique technique enabling layer-by-layer fabrication of net-shaped metal components. This study focuses on the effect of input process parameters on the maximum temperature generated in the deposited walls and its impact on the characteristics of the final products. An infrared thermometer device was used to study the maximum temperature that develops throughout the deposit process and its effects on microstructure, microhardness, and impact energy. Nine experiments were carried out based on the Taguchi orthogonal array and the selected feature matrix. The results showed that the temperature increases with an increase in the deposition current until it arrives at a maximum value of 828 C° but decreases with increased travel speed and wire feed ratio. At the same time, the frequency parameter did not have much effect on temperature. The average impact energy and microhardness of deposited components attained their maximum values, 111(J) and 456 (kg/mm2), respectively. The most suitable frequency range is within (125-250 Hz), making the process less defective and more stable. The grain size is a function of the heat input parameters and the frequency level. Thus, it can achieve refined grains with low current, high travel speed, and high cold wire feed. Impact energy improves by about 40% using a set of parameters as travel speed (5 mm/s), wire feed ratio 2.5, and frequency (250 Hz) in comparison to a group of travel speed (3 mm/s), wire feed ratio (1.5), and frequency (0 Hz) at the same the current of 160 A. Through the results of the experiments and variance of analysis (ANOVA), we found that the most important factor affecting the temperature was current; on the microhardness was the frequency; on the impact energy was the wire feed ratio and on the grain size, in addition to the heat input, was travel speed.