Optimizing the Y Content of Welding Wire for TIG Welding of Sand-Cast Mg-Y-RE-Zr Alloy
Yikai Gong, Guangling Wei, Xin Tong, Guonan Liu, Yingxin Wang, Wenjiang Ding
TL;DR
This study shows that adjusting the Y content in welding wire improves the quality of welded magnesium alloy joints used in aerospace components.
Contribution
A novel strategy of tailoring Y content in filler wires to suppress defects and enhance weld integrity in Mg-Y-RE-Zr alloys.
Findings
Reducing Y content to 2 wt.% in filler wire (WE23) suppresses oxide inclusions and improves joint integrity.
Joints welded with WE23 filler retain 93-98% of the mechanical properties of the base metal.
Higher Y content leads to coarser grains and continuous eutectic networks, reducing mechanical performance.
Abstract
The widespread application of WE43 (Mg-4Y-2Nd-1Gd-0.5Zr) alloy castings in aerospace components is hindered by the frequent formation of defects such as cracks, pores, and especially yttria inclusions. These defects necessitate subsequent welding. However, using homologous WE43 filler wires often exacerbates these issues, leading to high crack susceptibility and reintroduction of inclusions. Herein, we propose a novel strategy of tailoring Y content in filler wires to achieve high-quality welded joint of WE43 sand castings. Systematic investigations reveal that reducing Y content to 2 wt.% (WE23) effectively suppresses oxide inclusion formation and significantly enhances the integrity of the joint. The fusion zone microstructure evolves distinctly with varying Y levels: grain size initially increases, peaking at 24 μm with WE43 wire, then decreases with further Y addition. Moreover,…
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Taxonomy
TopicsAdvanced Welding Techniques Analysis · Magnesium Alloys: Properties and Applications · Aluminum Alloys Composites Properties