Effects of welding parameters on weld pool characteristics and shape in hybrid laser-TIG welding of AA6082 aluminum alloy: numerical and experimental studies

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• 作者：Amir Hossein Faraji ; Massoud Goodarzi ; Seyed Hossein Seyedein…
• 关键词：Hybrid laser arc welding ; Molten pool ; Aluminium alloys ; Mathematical models ; Process parameters
• 刊名：Welding in the World
• 出版年：2016
• 出版时间：January 2016
• 年：2016
• 卷：60
• 期：1
• 页码：137-151
• 全文大小：1,950 KB
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• 作者单位：Amir Hossein Faraji (1)
  Massoud Goodarzi (1)
  Seyed Hossein Seyedein (1)
  Carmine Maletta (2)
  
  1. School of Metallurgy and Materials Engineering, Iran University of Science and Technology, Tehran, Iran
  2. Department of Mechanical Engineering, University of Calabria, Arcavacata di Rende, Cosenza, Italy
  
• 刊物主题：Metallic Materials; Continuum Mechanics and Mechanics of Materials; Theoretical and Applied Mechanics;
• 出版者：Springer Berlin Heidelberg
• ISSN：1878-6669

文摘

The effects of three important welding parameters including laser power, welding current and welding speed on the weld pool characteristics, shape and dimensions in hybrid laser-TIG welding of AA6082 aluminum alloy are studied by numerical, experimental, and statistical approaches. For this aim, first, a 3D numerical model is used to simulate heat transfer and fluid flow in the weld pool and then resultant weld shape for various welding conditions. Besides, a set of experiments are performed to validate and calibrate the model. Finally, analysis of variance (ANOVA) method is applied to investigate more precisely how welding parameters affect weld dimensions. The simulation results show with increasing the laser power and welding current and decreasing the welding speed, the Marangoni and buoyancy forces increase. With increasing the laser power, the weld depth increases more significantly than the weld width. The weld half width increases with increasing the welding current, whereas the weld pool depth is relatively unchanged. Furthermore, with increasing the welding speed, both weld pool depth and half width decrease with similar slope. Generally, the presented model showed a good capability to predict the weld geometry and characteristics under various applied welding conditions which can reduce number of needed experiments. Keywords (IIW Thesaurus) Hybrid laser arc welding Molten pool Aluminium alloys Mathematical models Process parameters