Journal
JOURNAL OF MATERIALS PROCESSING TECHNOLOGY
Volume 289, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jmatprotec.2020.116912
Keywords
Alternating cusp-shaped magnetic field; Weld formation; Arc compression; Arc shape; Grain refinement; GTAW
Funding
- National Natural Science Foundation of China [51575362]
- Shenyang 'Shuangbai' Project [Z17-5-70]
- Major project of Scientific and Technological Achievement transformation of Shenyang [20-203-5-01]
- Ministry of Education and Science of Russian Federation [11.9505.2017/8.9]
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This study found that changes in excitation current and frequency under an external alternating cusp-shaped magnetic field can affect the arc shape and microstructure during gas tungsten arc welding, leading to improved welding results under specific parameters.
This study compared the arc shapes and microstructures obtained from gas tungsten arc welding of AZ91 magnesium alloy for different parameters of an external alternating cusp-shaped magnetic field which was applied during the welding process; the parameters included excitation currents of 1 A to 3 A and excitation frequencies of 0 Hz-100 Hz. The experimental results showed that the tungsten inert gas (TIG) arc did not rotate under the external alternating cusp-shaped magnetic field, but its cross section was continuously elongated or flattened with the change in frequency. As the excitation current and frequency changed, the arc expanded or compressed, the weld shape and the microstructure changed. When the excitation current was 2 A and the excitation frequency 80 Hz, the arc was obviously compressed, the weld appeared smooth, the depth-to-width ratio was the largest, and the microstructure was fine-grained.
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