Abstract
Double-wire arc additive manufacturing could manufacture large-sized components at low cost and high efficiency; however, serious heat input and heat accumulation result in poor forming quality and limit further efficiency and application. An auxiliary gas process platform for double-wire additive manufacturing is introduced in this paper to explore the influence mechanism of the auxiliary gas on deposition during the manufacturing process. Monolayer and multilayer test results showed that the auxiliary gas had a stirring effect on a liquid molten pool and a cooling effect on deposition layers, and different auxiliary gas parameters could also influence the welding arc stability, which all acted on the deposition morphology. The angle between the auxiliary gas nozzle and welding torch had the greatest impact on the formation of components, followed by the auxiliary gas flow, and the auxiliary nozzle height had minimal influence. When the angle increased from 0° to 30°, the forming morphology gradually flowed. Furthermore, increasing the auxiliary gas flow rate led to the decreased sample height and a serious flowing defect. However, decreasing the nozzle height increased the gas pressure, which would also reduce the height.
Highlights
Double-wire arc additive manufacturing (AM) by cold metal transfer (CMT) is widely used for its advantages of high efficiency and high speed.1 Wu et al.2 compared the single- and double-wire 316L stainless steel deposition with the same power supply, and the results showed that the deposition rate of double-wire deposition was 1.25 times that of the single wire
The hump of 3# was more obvious than that of 2#, which was mainly due to the enhancing pushing force and deviated arc angle caused by increasing the angle between the auxiliary gas nozzle and welding torch
The auxiliary gas process can affect the dynamic equilibrium of the molten pool to produce deformation of the unsolidified pool and arc, which plays the role of changing the weld morphology
Summary
Double-wire arc additive manufacturing (AM) by cold metal transfer (CMT) is widely used for its advantages of high efficiency and high speed. Wu et al. compared the single- and double-wire 316L stainless steel deposition with the same power supply, and the results showed that the deposition rate of double-wire deposition was 1.25 times that of the single wire. Double-wire arc additive manufacturing (AM) by cold metal transfer (CMT) is widely used for its advantages of high efficiency and high speed.. Wu et al. compared the single- and double-wire 316L stainless steel deposition with the same power supply, and the results showed that the deposition rate of double-wire deposition was 1.25 times that of the single wire. The highest deposition rate can only get up to 5.4 kg/h because more heat accumulation leads to poor morphology.. Based on the above studies, it is hard to improve the deposition rate and morphology in the meantime by changing the process parameters.. Researchers have carried out studies of several auxiliary processes to improve cooling rates and performance
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