from the conferences organized by TANGER Ltd. provisional website
The behaviour of added to Al-Mg alloy multi-walled carbon nanotubes (CNT) during fusion arc welding was studied. CNTs were added into gap between two Al-Mg alloy sheets which were welded with tungsten inert gas arc welding process (TIG). Welded specimen was fractured using 3-points bending test. Longitudinal section of the welded joint fracture was investigated with scanning electron microscopy and X-ray photoelectron spectroscopy. Evidences of CNT survival, poor CNT wetting by Al-Mg liquid alloy and degradation during arc welding process were found. Displacement of CNTs trough liquid metal and CNTs degradation products were studied. Study has shown CNTs emerge process during welding. Magnesium carbonate, aluminium carbide and carbonyl group were found as main degradation products. It was found that composition of degradation products in different parts of weld metal is different. That difference may be caused by inhomogeneity of temperature field and oxygen access to liquid weld metal.Keywords: Carbon nanotubes, aluminium matrix composites, arc welding
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