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Open AccessArticle

The Mechanism of Ultrasonic Vibration on Grain Refining and Degassing in GTA Spot Welding of Copper Joints

1
Key Laboratory of Advanced Technologies of Materials, Ministry of Education, School of Material Science and Engineering, Southwest Jiaotong University, Chengdu 610031, China
2
Engineering Technical College-Baghdad, Middle Technical University, Baghdad 10074, Iraq
*
Author to whom correspondence should be addressed.
Materials 2018, 11(5), 737; https://doi.org/10.3390/ma11050737
Received: 29 March 2018 / Revised: 28 April 2018 / Accepted: 4 May 2018 / Published: 7 May 2018
(This article belongs to the Section Manufacturing Processes and Systems)
This paper examines the effect of ultrasonic vibration (USV) on grain size and interrupted porosity in Gas Tungsten Arc (GTA) spot-welded copper. Grain size was refined by perpendicularly attaching a transducer to the welded sheet and applying USV to the weld pool for a short time (0, 2, 4, and 6 s) in addition improvements to the degassing process. Results illustrate a significant reduction of grain size (57%). Notably, USV provided interaction between reformations (fragmentation) and provided nucleation points (detaching particles from the fusion line) for grains in the nugget zone and the elimination of porosity in the nugget zone. The GTA spot welding process, in conjunction with USV, demonstrated an improvement in the corrosion potential for a copper spot-welded joint in comparison to the joint welded without assistance of USV. Finally, welding of copper by GTA spot welding in conjunction with ultrasound for 2 s presented significant mechanical properties. View Full-Text
Keywords: GTA spot welding; copper; grain refinement; tensile shear strength; degassing; corrosion GTA spot welding; copper; grain refinement; tensile shear strength; degassing; corrosion
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MDPI and ACS Style

Al-Ezzi, S.; Quan, G.; Elrayah, A. The Mechanism of Ultrasonic Vibration on Grain Refining and Degassing in GTA Spot Welding of Copper Joints. Materials 2018, 11, 737.

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