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

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 m...

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Main Authors:	Hao Chen, Ning Guo, Kexin Xu, Cheng Liu, Guodong Wang
Format:	Article
Language:	English
Published:	MDPI AG 2020-03-01
Series:	Materials
Subjects:	underwater wet welding fcaw ultrasonic-assisted microstructure refinement in-situ x-ray imaging
Online Access:	https://www.mdpi.com/1996-1944/13/6/1442

id	doaj-98031b1412574a4a9f5b8f0791ccf88f
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spelling	doaj-98031b1412574a4a9f5b8f0791ccf88f2020-11-25T03:31:06ZengMDPI AGMaterials1996-19442020-03-01136144210.3390/ma13061442ma13061442Investigating the Advantages of Ultrasonic-assisted Welding Technique Applied in Underwater Wet Welding by in-situ X-ray Imaging MethodHao Chen0Ning Guo1Kexin Xu2Cheng Liu3Guodong Wang4State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin 150001, ChinaState Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin 150001, ChinaShandong Provincial Key Laboratory of Special Welding Technology, Harbin Institute of Technology at Weihai, Weihai 264209, ChinaShandong Provincial Key Laboratory of Special Welding Technology, Harbin Institute of Technology at Weihai, Weihai 264209, ChinaState Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin 150001, ChinaIn 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/mm<sup>2</sup> due to the microstructure refinement at the optimum ultrasonic power.https://www.mdpi.com/1996-1944/13/6/1442underwater wet weldingfcawultrasonic-assistedmicrostructure refinementin-situ x-ray imaging
collection	DOAJ
language	English
format	Article
sources	DOAJ
author	Hao Chen Ning Guo Kexin Xu Cheng Liu Guodong Wang
spellingShingle	Hao Chen Ning Guo Kexin Xu Cheng Liu Guodong Wang Investigating the Advantages of Ultrasonic-assisted Welding Technique Applied in Underwater Wet Welding by in-situ X-ray Imaging Method Materials underwater wet welding fcaw ultrasonic-assisted microstructure refinement in-situ x-ray imaging
author_facet	Hao Chen Ning Guo Kexin Xu Cheng Liu Guodong Wang
author_sort	Hao Chen
title	Investigating the Advantages of Ultrasonic-assisted Welding Technique Applied in Underwater Wet Welding by in-situ X-ray Imaging Method
title_short	Investigating the Advantages of Ultrasonic-assisted Welding Technique Applied in Underwater Wet Welding by in-situ X-ray Imaging Method
title_full	Investigating the Advantages of Ultrasonic-assisted Welding Technique Applied in Underwater Wet Welding by in-situ X-ray Imaging Method
title_fullStr	Investigating the Advantages of Ultrasonic-assisted Welding Technique Applied in Underwater Wet Welding by in-situ X-ray Imaging Method
title_full_unstemmed	Investigating the Advantages of Ultrasonic-assisted Welding Technique Applied in Underwater Wet Welding by in-situ X-ray Imaging Method
title_sort	investigating the advantages of ultrasonic-assisted welding technique applied in underwater wet welding by in-situ x-ray imaging method
publisher	MDPI AG
series	Materials
issn	1996-1944
publishDate	2020-03-01
description	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/mm<sup>2</sup> due to the microstructure refinement at the optimum ultrasonic power.
topic	underwater wet welding fcaw ultrasonic-assisted microstructure refinement in-situ x-ray imaging
url	https://www.mdpi.com/1996-1944/13/6/1442
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Investigating the Advantages of Ultrasonic-assisted Welding Technique Applied in Underwater Wet Welding by in-situ X-ray Imaging Method

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