期刊
MATERIALS
卷 14, 期 17, 页码 -出版社
MDPI
DOI: 10.3390/ma14174884
关键词
ultrasonic; arc; formation; microstructure; mechanical property
类别
资金
- National Natural Science Foundation of China [51905230]
- State Key Lab of Advanced Welding and Joining, Harbin Institute of Technology [AWJ-20M06]
- Jiangsu Province innovative and entrepreneurial doctor Project
This study investigates the introduction of ultrasonic energy into MIG welding arc and weld pool, and its influence on arc shape, arc energy, and weld formation, microstructure, and mechanical properties. The results show that ultrasound can effectively refine the microstructure of the weld zone and fusion zone, but has little effect on the heat-affected zone.
Ultrasonic energy is introduced into the Metal Inert Gas (MIG) welding arc and weld pool by superposition of an ultrasonic frequency current. In this study, the arc shape, arc energy, and ultrasonic energy that responded to ultrasonic excitation voltage and frequency is investigated. The comprehensive influence of arc and ultrasonic energy on weld formation, microstructure, and mechanical properties is further studied. The arc and ultrasonic energy are analyzed by using a high-speed camera and microphone, respectively. The results showed that the arc width increased, and the arc energy density decreased after the superposition of ultrasonic current. The arc height could be compressed under certain ultrasonic excitation parameters. The ultrasonic excitation voltage and frequency had a direct influence on the ultrasonic energy. The arc height, arc energy density, and ultrasonic energy together determined the weld width. Ultrasound could effectively refine the microstructure of the weld zone and fusion zone but had little effect on the heat-affected zone. Ultrasound improved the hardness of the joint by refining the grain and the second phase. The joint hardness was the highest when the ultrasonic excitation voltage was 100 V, and the frequency was 30 kHz.
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