Next Article in Journal
N-Doped Carbon Xerogels as Pt Support for the Electro-Reduction of Oxygen
Next Article in Special Issue
Thermal, Spectral and Laser Properties of Er3+:Yb3+:GdMgB5O10: A New Crystal for 1.5 μm Lasers
Previous Article in Journal
Hole-Transporting Materials for Printable Perovskite Solar Cells
Open AccessArticle

Effects of Pulse Parameters on Weld Microstructure and Mechanical Properties of Extra Pulse Current Aided Laser Welded 2219 Aluminum Alloy Joints

1
School of Mechanical Science and Engineering, Jilin University, Changchun 130025, China
2
State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin 150001, China
*
Author to whom correspondence should be addressed.
Materials 2017, 10(9), 1091; https://doi.org/10.3390/ma10091091
Received: 18 August 2017 / Revised: 9 September 2017 / Accepted: 11 September 2017 / Published: 15 September 2017
(This article belongs to the Special Issue Laser Materials Processing)
In order to expand the application range of laser welding and improve weld quality, an extra pulse current was used to aid laser-welded 2219 aluminum alloy, and the effects of pulse current parameters on the weld microstructure and mechanical properties were investigated. The effect mechanisms of the pulse current interactions with the weld pool were evaluated. The results indicated that the coarse dendritic structure in the weld zone changed to a fine equiaxed structure using an extra pulse current, and the pulse parameters, including medium peak current, relatively high pulse frequency, and low pulse duty ratio benefited to improving the weld structure. The effect mechanisms of the pulse current were mainly ascribed to the magnetic pinch effect, thermal effect, and electromigration effect caused by the pulse current. The effect of the pulse parameters on the mechanical properties of welded joints were consistent with that of the weld microstructure. The tensile strength and elongation of the optimal pulse current-aided laser-welded joint increased by 16.4% and 105%, respectively, compared with autogenous laser welding. View Full-Text
Keywords: laser welding; aluminum alloy; pulse current; weld microstructure; mechanical properties laser welding; aluminum alloy; pulse current; weld microstructure; mechanical properties
Show Figures

Figure 1

MDPI and ACS Style

Zhang, X.; Li, L.; Chen, Y.; Yang, Z.; Chen, Y.; Guo, X. Effects of Pulse Parameters on Weld Microstructure and Mechanical Properties of Extra Pulse Current Aided Laser Welded 2219 Aluminum Alloy Joints. Materials 2017, 10, 1091.

Show more citation formats Show less citations formats
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map by Country/Region

1
Back to TopTop