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Correlation spectroscopy as a tool for detecting losses of ligand elements in laser welding of aluminium alloys |
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| Authors: | T Sibillano A Ancona V Berardi E Schingaro P Parente PM Lugar |
| Institution: | aCNR-INFM LIT3-Laboratorio Regionale di Ricerca, Formazione, Sviluppo e Trasferimento alle Imprese di Tecnologie Laser Innovative, via Orabona 4, I-70126 Bari, Italy bDipartimento Interuniversitario di Fisica, Università di Bari e Politecnico di Bari, via Orabona 4, I-70126 Bari, Italy cDipartimento Geomineralogico, Università di Bari, via Orabona 4, I-70126 Bari, Italy |
| Abstract: | The plasma plume induced during laser welding of metals is a mixture of metal vapour, coming from the vaporised weld pool surface and shielding gas. The influence of the shielding gas on the welded joints quality is not yet well understood and very few investigations, to the best of our knowledge, were addressed to study its role in case of welding of aluminium–magnesium alloys. In this paper we present a study of the dynamics of plasma plume produced in laser welding of 5xxx aluminium alloys by means of correlation spectroscopy. By our results we can correlate the influence of the welding speed, in case of ineffective gas shielding, to the loss of alloying elements. Finally, the results obtained are consistent with the EDX analysis performed in post-processing on the welded joints. |
| Keywords: | Laser welding Optical spectroscopy Correlation analysis Aluminium alloys |
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