Increasing the Quality of Welded Joints of Al-Si 6082 Alloys by Introducing Forced Vibrations

摘要

Solidification process of aluminum alloys weld has a major influence on the quality of the joined material. Based on this fact, introducing forced vibrations during welding aims to prevent formation of increase tensions inside the welded structure and diminish the presence of pinholes or pores as a result of material contraction for alloys containing metals with a different melting point / solidification point. To avoid such a reaction it is essential to know and control how the melted material is evolving during solidification. The control on metallographic bath it is performed through a technological process which requires that the Al-Si alloy to be welded on a surface with longitudinal vibration consisting in a platform whose support can be controlled depending on the required frequency and a M.I.G welding equipment with mechanized welding torch setup to weld, the test peace, above the platform surface. Welding in a mechanical forced vibration environment, leads to a system of uniform and fine grain size microstructures which induces advanced diffusion in the heat affected zone. The diffusion process occurs faster resulting in decreased structural tensions. The presence of voids and pores inside the material structure is inferior for welding on a vibrating surface in comparison with the classic solution.