| METALS AND METAL MATRIX COMPOSITES |
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| Metal Droplet Transition and Welding Formation of Twin-wire Single-arc Gas Shielded Welding |
| LI Zhiyong1,2, LI Peng2, HU Guanglong2, ZHANG Guangxian1,2,*
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1 College of Control Science and Engineering, Shandong University, Jinan 250101, China
2 Shandong Aotai Electric Co., Ltd.,Jinan 250101, China |
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Abstract Twin-wire single-arc gas shielded welding is a newly developed melting electrode welding method. The system consists of a single power source, a single wire feeding mechanism, a single welding torch. The twin wires share the contact tip with two holes, and the single power source supplies the twin wires simultaneously through the contact tip. The output current of the twin wires forms a single arc, and the droplets at the ends of the twin wires interact each other, forming a co-melt droplet and stably translating to the molten pool. Using the high-speed camera, information synchronization acquisition equipment and welding power source, a twin-wire single-arc gas shielded welding droplet transfer testing system is developed. The influences of welding current on the droplet size, transition behavior and weld morphology were investigated, and the droplet transfer mechanism of twin-wire single-arc gas shielded welding is elucidated. The results show that with the increasing of welding current, the transition frequency gradually increases and the droplet volume gradually decreases, so that the transition behavior of the molten droplet changes in four modes, which are multi-pulse one drop transition, one pulse one drop transition, spray transition and buried arc with spray transition. The weld morphology investigation shows that as the welding current increases, the weld penetration depth gradually increases, and the melting width firstly increases and then decreases. The best weld formation is obtained at the welding current of 570 A, and the correspon-ding deposition rate achieves 15.8 kg/h.
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Received: 25 September 2202
Published: 25 September 2022
Online: 2022-09-26
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| Fund:The National Key Research and Development Program of China (2017YFB1103204), and the Key Research and Development Program of Shandong Province(2020CXGC010207). |
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2022, Vol. 36 
