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

被引：22
作者：
Chen, Hao [1 ,2 ]
Guo, Ning [1 ,2 ,3 ]
Xu, Kexin [2 ]
Liu, Cheng [2 ]
Wang, Guodong [1 ,2 ]
机构：
[1] Harbin Inst Technol, State Key Lab Adv Welding & Joining, Harbin 150001, Peoples R China
[2] Harbin Inst Technol Weihai, Shandong Prov Key Lab Special Welding Technol, Weihai 264209, Peoples R China
[3] Shandong Inst Shipbldg Technol, Weihai 264209, Peoples R China
来源：
MATERIALS | 2020年 / 13卷 / 06期
关键词：
underwater wet welding; FCAW; ultrasonic-assisted; microstructure refinement; in-situ X-ray imaging; MECHANICAL-PROPERTIES; ARC STABILITY; HEAT INPUT; MICROSTRUCTURE; QUALITY;
D O I：
10.3390/ma13061442
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
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 mu m, 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(2) due to the microstructure refinement at the optimum ultrasonic power.
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页数：14
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