Experimental and numerical analysis of shunting effect in resistance spot welding of Al2219 sheets
| Autor: | J. Jakubowski, M. Jafari Vardanjani, Jacek Senkara, J. Godek, Alireza Araee |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
0209 industrial biotechnology
Engineering Computer Networks and Communications business.industry Numerical analysis General Engineering 02 engineering and technology Structural engineering Atomic and Molecular Physics and Optics Finite element method Shunting 020303 mechanical engineering & transports 020901 industrial engineering & automation 0203 mechanical engineering Artificial Intelligence business Spot welding Information Systems |
| Zdroj: | Bulletin of the Polish Academy of Sciences Technical Sciences. 64:425-434 |
| ISSN: | 2300-1917 |
| DOI: | 10.1515/bpasts-2016-0048 |
| Popis: | Few aspects of shunting effect have been studied so far. Shunting effect in resistance spot welding (RSW) occurs when the electrical current passes through the previous spot welds. Value of this current depends mostly on distance, number, and size of previous spot welds. This will cause some dimensional and metallurgical changes in welding nugget as well as heat affected zone (HAZ). In this study, shunting effect of RSW is considered by finite element method (FEM) and the results are compared to experiments performed on aluminum alloy 2219. Weld spacing together with welding current and time are considered to discover the effect of shunting current in the final quality of nugget. A three factor experiment design has been performed to find the significance of factors and interactive effects, as well as finite element model verification. Electrothermal and mechanical interactions are considered in the FEM. Experimental and numerical solutions have yielded similar results in terms of welding nugget properties. Asymmetry in electrical potential, temperature, stress distribution and geometry of shunted nugget is predicted and verified directly or indirectly. Intense effect of shunting current on nugget height, asymmetric growth of heat affected zone (HAZ) toward previous welding nugget, as well as concentration of alloying elements along grain boundaries are also discovered. |
| Databáze: | OpenAIRE |
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