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Investigating the Advantages of Ultrasonic-assisted Welding Technique Applied in Underwater Wet Welding by in-situ X-ray Imaging Method

by Hao Chen 1,2, Ning Guo 1,2,3,*, Kexin Xu 2, Cheng Liu 2 and Guodong Wang 1,2
1
State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin 150001, China
2
Shandong Provincial Key Laboratory of Special Welding Technology, Harbin Institute of Technology at Weihai, Weihai 264209, China
3
Shandong Institute of Shipbuilding Technology, Weihai 264209, China
*
Author to whom correspondence should be addressed.
Materials 2020, 13(6), 1442; https://doi.org/10.3390/ma13061442
Received: 17 February 2020 / Revised: 11 March 2020 / Accepted: 16 March 2020 / Published: 21 March 2020
(This article belongs to the Special Issue Welding and Joining Processes of Materials)
In this study, the effects of ultrasonic on melt pool dynamic, microstructure, and properties of underwater wet flux-cored arc welding (FCAW) joints were investigated. Ultrasonic vibration enhanced melt flow and weld pool oscillation. Grain fragmentation caused by cavitation changed microstructure morphology and decreased microstructure size. The proportion of polygonal ferrite (PF) reduced or even disappeared. The width of grain boundary ferrite (GBF) decreased from 34 to 10 μm, and the hardness increased from 204 to 276 HV. The tensile strength of the joint increased from 545 to 610 MPa, and the impact toughness increased from 65 to 71 J/mm2 due to the microstructure refinement at the optimum ultrasonic power. View Full-Text
Keywords: underwater wet welding; FCAW; ultrasonic-assisted; microstructure refinement; in-situ X-ray imaging underwater wet welding; FCAW; ultrasonic-assisted; microstructure refinement; in-situ X-ray imaging
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Chen, H.; Guo, N.; Xu, K.; Liu, C.; Wang, G. Investigating the Advantages of Ultrasonic-assisted Welding Technique Applied in Underwater Wet Welding by in-situ X-ray Imaging Method. Materials 2020, 13, 1442.

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