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Materials 2017, 10(9), 1031; doi:10.3390/ma10091031

Study of Gravity Effects on Titanium Laser Welding in the Vertical Position

1
State Key Laboratory of Tribology, Department of Mechanical Engineering, Tsinghua University, Beijing 100084, China
2
Aerospace Research Institute of Materials & Processing Technology, Beijing 100076, China
*
Authors to whom correspondence should be addressed.
Received: 22 July 2017 / Revised: 15 August 2017 / Accepted: 2 September 2017 / Published: 8 September 2017
(This article belongs to the Section Manufacturing Processes and Systems)
View Full-Text   |   Download PDF [8106 KB, uploaded 8 September 2017]   |  

Abstract

To obtain satisfactory welds in positional laser beam welding, it is necessary to know how process parameters will influence the quality of welds in different welding positions. In this study, the titanium alloy Ti6Al4V sheets were laser welded in two vertical welding positions (vertical up and vertical down), and the appearance, porosity, strength, and ductility of the laser joints were evaluated. Results show that undercuts of the vertical up welds were greater than that of vertical down welds, while the porosity contents were much higher in vertical down welds than that in vertical up welds. When welding with a higher heat input, the vertical up welding position resulted in poor weld profiles (undercuts and burn-through holes), whereas the vertical down welding position led to excessive porosity contents in welds. Both severe undercut and excessive porosity were detrimental to the tensile properties of the welds. Weld appearance was improved and porosity contents were reduced by using a lower heat input, achieving better weld quality. Therefore, it is suggested that process parameter settings with relatively high laser powers and welding speeds, which can result in lower heat inputs, are used when laser welding the Ti6Al4V titanium alloys vertically. View Full-Text
Keywords: laser beam welding; positional welding; titanium alloy; porosity laser beam welding; positional welding; titanium alloy; porosity
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MDPI and ACS Style

Chang, B.; Yuan, Z.; Pu, H.; Li, H.; Cheng, H.; Du, D.; Shan, J. Study of Gravity Effects on Titanium Laser Welding in the Vertical Position. Materials 2017, 10, 1031.

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