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

Abstract:

The solidification process of aluminum alloys welded area has a major influence on the quality of the joining material. Based on this fact, the introduction of forced vibrations during welding aims to prevent the formation of increase tensions inside the welded structure and diminish the presence of pinholes or pores as a result of material contraction of alloys containing metals with a different melting point / solidification point.To avoid this happening it is essential to know and control how the melted material is evolving during the solidification. This step requires that the Al-Si alloy to be welded on a surface with longitudinal vibration composed of a platform whose support can be controlled depending on the required frequency and un 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, results in the formation of a more uniform and finer grain size microstructure with a more advanced diffusion in the 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 the oscillating welding process in comparison with the classic solution.

• Periodical: Materials Science Forum (Volume 907)
• Pages: 231-237
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.907.231
• Online since: September 2017
• Authors: Mihai Alexandru Bodeanu*, Teodor Machedon-Pisu
• Keywords: Aluminum Alloys, Forced Vibrations, Welding Technology

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