Abstract
Abstract In this paper, I-butt welding with 6mm thickness using Plasma-GMA welding was carried out. And weld characteristics of the Al-5083 aluminium alloy for Plasma-GMA hybrid welding was evaluated. The orthogonal experimental design was used to investigate the influence of plasma-MIG welding parameters such as plasma current, wire feeding rate, MIG-welding voltage and welding speed on the weld bead geometry and tensile strength using the ANOVA(Analysis of Variation). Then we conducted evaluation of contribution for process parameters. ANOVA results show that bead dimensions are affected by wire feeding speed, welding voltage and welding speed and tensile strength is mainly affected by welding speed and plasma arc current. Tensile strength was decreased by rise in plasma welding current because GMA welding current was decreased by plasma arc.Key Words : AL5083 alloy, Plasma-GMA welding, ANOVA, Hybrid welding, Orthogonal design ISSN 1225-6153Online ISSN 2287-8955 1. 서 론 최근 세계적으로 해양환경 오염규제 및 에너지 절감 등에 대한 요구가 높아짐에 따라 중소형선의 경우 경량화, 높은 내식성, 재활용이 가능한 환경 친화적인 선박에 대한 수요가 증가하고 있다. 특히 중소형 선박에 사용되어 왔던 FRP(fiber reinforced plastic) 소재는 생산비용이 낮은 장점은 있으나, 폐선처리가 문제가 되면서 알루미늄 선박에 관심이 고조되고 있다
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