Journal
OPTICS AND LASER TECHNOLOGY
Volume 66, Issue -, Pages 15-21Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.optlastec.2014.08.009
Keywords
Hot cracking; Al alloy; Laser welding
Categories
Funding
- National Natural Science Foundation of China [51204109]
- State Key Program of National Natural Science Foundation of China [51035004]
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This paper investigates hot cracking rate in Al fiber laser welding under various process conditions and performs corresponding process optimization. First, effects of welding process parameters such as distance between welding center line and its closest trim edge, laser power and welding speed on hot cracking rate were investigated experimentally with response surface methodology (RSM). The hot cracking rate in the paper is defined as ratio of hot cracking length over the total weld seam length. Based on the experimental results following Box-Behnken design, a prediction model for the hot cracking rate was developed using a second order polynomial function considering only two factor interaction. The initial prediction result indicated that the established model could predict the hot cracking rate adequately within the range of welding parameters being used. The model was then used to optimize welding parameters to achieve cracking-free welds. (C) 2014 Elsevier Ltd. All rights reserved.
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