Mg-6.7 wt.% 알루미늄 합금의 GMA 및 GTA 용접 특성평가

Abstract

In this study, the arc weldability of an aluminum alloy was investigated based on its Mg content. The base materi- als used in the experiments were aluminum with a Mg content of 6.7 wt.% (referred as Al-6Mg) and commercial Al5083-O. The weldability of two types of fusion welding methods was evaluated: gas metal arc welding (GMAW) and gas tungsten arc welding (GTAW). The tensile strength, hardness, alloy composition, and microstructure proper- ties of the welds of two types of the aluminum alloys were compared. The tensile strength values of the GMAW and GTAW welds of Al-6Mg were 20% and 10% higher than those of Al5083-O, respectively. The weld hardness of the GMAW and GTAW welds of both aluminum alloys were similar. Al-6Mg by GMAW and GTAW were smaller than those of Al5083-O. Based on the results of analysis of the welds, the residual magnesium content was as high as 37% by GMAW and 30% by GTAW.