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Appl. Sci. 2017, 7(4), 376;

A Comparative Study on the Laser Welding of Ti6Al4V Alloy Sheets in Flat and Horizontal Positions

State Key Laboratory of Tribology, Department of Mechanical Engineering, Tsinghua University, Beijing 100084, China
Aerospace Research Institute of Materials & Processing Technology, Beijing 100076, China
Authors to whom correspondence should be addressed.
Received: 21 March 2017 / Revised: 6 April 2017 / Accepted: 6 April 2017 / Published: 10 April 2017
(This article belongs to the Special Issue Solid State Lasers Materials, Technologies and Applications)
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Laser welding has been increasingly utilized to manufacture a variety of components thanks to its high quality and speed. For components with complex shapes, the welding position needs be continuously adjusted during laser welding, which makes it necessary to know the effects of the welding position on the quality of the laser welds. In this paper, the weld quality under two (flat and horizontal) welding positions were studied comparatively in the laser welding of Ti6Al4V titanium alloy, in terms of weld profiles, process porosity, and static tensile strengths. Results show that the flat welding position led to better weld profiles, less process porosity than that of the horizontal welding position, which resulted from the different actions of gravity on the molten weld metals and the different escape routes for pores under different welding positions. Although undercuts showed no association with the fracture positions and tensile strengths of the welds, too much porosity in horizontal laser welds led to significant decreases in the strengths and specific elongations of welds. Higher laser powers and travel speeds were recommended, for both flat and horizontal welding positions, to reduce weld porosity and improve mechanical properties. View Full-Text
Keywords: titanium alloy; laser welding; welding position; porosity; weld profile titanium alloy; laser welding; welding position; porosity; weld profile

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Chang, B.; Yuan, Z.; Pu, H.; Li, H.; Cheng, H.; Du, D.; Shan, J. A Comparative Study on the Laser Welding of Ti6Al4V Alloy Sheets in Flat and Horizontal Positions. Appl. Sci. 2017, 7, 376.

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