51. Numerical analyses of material flows and thermal processes during friction plug welding for AA2219 aluminum alloy
- Author
-
Bo Du, Wenshen Tang, Xinqi Yang, and Zhuanping Sun
- Subjects
0209 industrial biotechnology ,Normal force ,Materials science ,Effective stress ,Metals and Alloys ,Rotational speed ,02 engineering and technology ,Welding ,Microstructure ,Industrial and Manufacturing Engineering ,Computer Science Applications ,law.invention ,Material flow ,020303 mechanical engineering & transports ,020901 industrial engineering & automation ,0203 mechanical engineering ,law ,Modeling and Simulation ,Ceramics and Composites ,Deformation (engineering) ,Composite material ,Spark plug - Abstract
A coupled thermo-mechanical model is developed for friction plug welding (FPW) process of AA2219 aluminum alloy, which is validated by the experimental results of the torque and temperature history. Both the deformation of plug and base metal are considered in this model. It is concluded that weak-bonding and unbonding is caused by the poor interface normal force and material flow based on the simulational and experimental results. Significant inhomogeneity in distribution of temperature, effective strain and effective stress is observed along the thickness direction of FPW joint, resulting in the inhomogeneity of microstructure and mechanical property. The peak temperature of bonding interface can reach 508 °C, which is 79% of the melting point of base metal. Higher welding force and rotational speed could promote material flow and improve interface normal force, which is beneficial to obtaining better connection.
- Published
- 2020