We found a match
Your institution may have access to this item. Find your institution then sign in to continue.
- Title
The Mechanism of Ultrasonic Vibration on Grain Refining and Degassing in GTA Spot Welding of Copper Joints.
- Authors
Al-Ezzi, Salih; Quan, Gaofeng; Elrayah, Adil
- Abstract
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.
- Subjects
GRAIN refinement; DEGASSING of metals; SPOT welding; GAS tungsten arc welding; GRAIN size
- Publication
Materials (1996-1944), 2018, Vol 11, Issue 5, p737
- ISSN
1996-1944
- Publication type
Article
- DOI
10.3390/ma11050737