Microstructure and Mechanical Properties of a Weld Seam from Magnetron High-Current CO2 Welding

External magnetic field (EMF)-assisted high-current CO2 welding is beneficial for improving the large spatter and poor performance of the welding heat-affected zone for mild steels under high-current welding specifications. In this paper, the droplet transfer behaviors were determined using a high-s...

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Bibliographic Details
Published inCrystals (Basel) Vol. 14; no. 10; p. 911
Main Authors Miao, Jun-Yan, Li, Yi-Wen, Ren, Bo-Wen, Zhao, Hong-Lei, Zhang, Si-Yu, Chang, Yun-Long, Wang, Qiang
Format Journal Article
LanguageEnglish
Published Basel MDPI AG 01.10.2024
Subjects
Cameras
CO2 welding
Droplets
external magnetic field
Heat affected zone
High current
High speed cameras
Liquid bridges
Liquid metals
Lorentz force
Low carbon steels
Magnetic fields
Magnetic properties
Mechanical properties
Microstructure
microstructure and mechanical properties
Morphology
Seam welds
Simulation
Specifications
Tensile strength
Welded joints
Welding
China
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Summary:External magnetic field (EMF)-assisted high-current CO2 welding is beneficial for improving the large spatter and poor performance of the welding heat-affected zone for mild steels under high-current welding specifications. In this paper, the droplet transfer behaviors were determined using a high-speed camera on a self-developed magnetically controlled CO2 welding system. Based on these welding specifications, a three-dimensional, transient, multi-energy field coupling welding system model to investigate the mechanism of the droplet and molten pool in EMF-assisted welding was developed. The microstructure and mechanical properties of the welded joint were systematically studied. The results show that the Lorentz force applied by the EMF to twist the droplet decreases the accumulated energy in the short-circuited liquid bridge and changes the liquid metal flow condition, both of which reduce the spatter by 7% but increase the welded joint hardness by 10% and tensile strength by 8%.
ISSN:2073-4352
2073-4352
DOI:10.3390/cryst14100911