Abstract
The main purpose of the study was to modify the surface layer of the AZ91 magnesium alloys with the use of the GTAW (Gas Tungsten Arc Welding) method. The remelting process was conducted with the use of an AC current with the concurrent cooling of the magnesium alloy in the liquid nitrogen bath. The assessment of the effectiveness of the treatment carried out with the use of the GTAW method was based on the analysis of the surface layer structure, and the investigation of hardness and the resistance to abrasion wear. Besides, the investigations of the corrosion resistance were carried out. The analysis of the treatment parameters combined with a macroscopic assessment and the structural changes in the surface layers allowed to distinguish some correlations attesting to the possibility of the remelting zone geometry shaping. The found structural effects of treatment such as significant refinement of the structure and its homogenization, as well as the positive results of corrosion investigations and mechanical tests proved that it is possible to achieve the intended research objectives and effectively modify magnesium alloys by the welding method.
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