| METALS AND METAL MATRIX COMPOSITES |
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| Morphology and Phase Structure Analysis of Spatter and Fume in High Current GMAW Welding |
| FAN Ding1,2, YANG Wenyan1, XIAO Lei1
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1 School of Materials Science and Engineering, Lanzhou University of Technology, Lanzhou 730050
2 State Key Laboratory of Advanced Processing and Reuse of Nonferrous Metals, Lanzhou University of Technology, Lanzhou 730050 |
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Abstract In the process of gas metal arc welding (GMAW), the arc is unstable and the formation of the weld becomes worse when the droplet transfer is transformed into a rotating jet. A process tests were carried out on Q235 low carbon steel to explore the morphology and phase structure of the spatter and fume generated during welding. The results showed that the molten metal at high temperature is thrown out and atomized, and the droplets were spheroidized and solidified rapidly during the flight. The surface of the spattered particles exhibited a special appearance, and the particles were mainly composed of oxide. When the arc burned, the spot with high current density formed at the end of the welding wire, and the temperature at the spot was quite high. With the increase of welding current, the amount of metal evaporation increased. Metal evaporation takes away most of the Si, Mn and other alloy elements in the welding wire. While Si and Mn are all effective deoxidizing elements, therefore, the alloying elements was removed by metal evaporation, which affected the content of O, and further exerted negative effect on the weld performance. The particle size of smoke and dust to the mode of droplet transfer, ranging from 10-1 μm to 102 μm. The majority of particle possessed the size of 10 μm to 60 μm, which could enter the lungs through the upper respiratory tract, and would do harm to the respiratory system and the nervous system of the human body.
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Published: 12 July 2019
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| Fund:This work was financially supported by the National Natural Science Foundation of China (51775256), Gansu Province Basic Research Innovation Group Project (17JR5RA107), Gansu Provincial University Collaborative Innovation Team Project (2017C-07). |
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2019, Vol. 33 
