TIG Assisted FSW을 이용한 이종재료(AZ31B/SS400)용접부의 용접성 평가

Abstract

Recently, regulations for the energy exhibition are globally reinforced and industrial trends toward green growth are turned, so that lightweight in materials for transportation such as vehicle and aircraft is the challenge faced by everyone. In these circumstances, use of light weight alloys has rapidly increased. In case of using structural materials in an actual product, two kinds of material is required expecially weld joints. However, joining dissimilar materials is extremely difficult or impossible with conventional Fusion Welding processes. This thesis presents the development of TIG assisted FSW by applying TIG Preheating to harder material during FSW process. In order to develop Welding techniques for Joining Dissimilar Materials - Magnesium Alloys, Mg-Al-Zn(Mn), which are widely used because of its superior Weldability and Mild steel(C:0.12∼0.3%). Also, optimization of process variable of butt-welded joints is described in this paper. In doing so, advantage of TIG assisted FSW is proved by optimizing process variable like rotation speed and welding speed through mechanical experiments Hence, transportation industries which use Magnesium Alloys to reduce weight of materials will obtain quality improvement of products and productivity growth by applying the welding technique.