Journal
JOURNAL OF MATERIALS PROCESSING TECHNOLOGY
Volume 214, Issue 7, Pages 1316-1325Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jmatprotec.2014.01.015
Keywords
Pulsed Nd:YAG laser welding; Overlapping factor; Porosity formation; Ti6Al4V alloy
Funding
- National Natural Science Foundation of China [50875200, 51275391]
- Research Fund for the Doctoral Program of Higher Education of China [20100201110065, 20090201120014]
- Natural Science Foundation of Shanxi Province [2011JM6008]
- Fundamental Research Funds for the Central University of China
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The overlapping factor of pulsed laser welding is used to help understand the correlation between welding parameters and the quality of Ti6Al4V welded joints. The number of porosity decreases with the increase in overlapping factor, and the welded joints are almost completely free of porosity when overlapping factor is greater than 75%. This can be attributed to the fact that the remelted volume of the spot region increases with the increase of overlapping factor, which assists porosity formed in the previous pulse wave in escaping from molten pool formed by the subsequent pulse. With the increase of overlapping factor, the weld microstructure becomes much coarser and the width of the fully transformed region of heat affected zone increases, which reduces the microstructure gradient and microhardness gradient from the fusion zone to heat affected zone. A method to evaluate the porosity susceptibility of a specific welding condition prior to actual welding process is presented. (C) 2014 Elsevier B.V. All rights reserved.
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