Journal
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
Volume 75, Issue 1-4, Pages 363-372Publisher
SPRINGER LONDON LTD
DOI: 10.1007/s00170-014-6129-4
Keywords
Fiber laser; Keyhole welding; Weld shape prediction; Finite element analysis (FEA)
Funding
- National Natural Science Foundation of China [51323009]
- National Program on Key Basic Research Project (973 Program) of China [2014CB046703]
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It is of great theoretical significance and engineering value to predict the weld shape for selecting welding parameters. A simplified and efficient three-dimensional (3D) heat conduction model was established to predict weld shape in fiber laser keyhole welding. An improved hybrid heat source model was proposed which consisted of a surface heat flux with a Gaussian distribution and a cylindrical heat source with damped peak value through the depth. The simulation results quite coincided with experimental ones, which indicated that the improved hybrid heatmodel can explain the energy absorption in keyhole more accurately. Both partially and fully penetrated weld shapes and sizes were predicted. The results showed that prediction errors of the sizes of weld cross-sections in partial-penetration welding were less than 8.9 %. While in full-penetrated welds, they were less than 8.8 % except for size of weld waist.
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