Abstract
Gas metal arc welding of aluminum 5083 alloys was performed using three new welding wires with different magnesium and manganese contents and compared with commercial aluminum 5183 alloy filler wire. To investigate the effect of magnesium and manganese contents on the mechanical properties of welds, mechanical properties were evaluated through tensile strength, bending, and microhardness tests. In addition, the microstructure and chemical composition were analyzed to compare the differences between each weld. The tensile strengths of welds using aluminum alloy filler wires with a magnesium content of 7.33 wt.% (W1) and 6.38 wt.% (W2), respectively, were similar. The tensile strength and hardness of welds using wires with a similar magnesium content, but a different manganese content of 0.004 wt.% (W2) and 0.46 wt.% (W3), respectively, were higher in the wire with a high manganese content. Through various mechanical and microstructural property analyses, when the magnesium content of the filler wire was 6 wt.% or more, the manganese content, rather than the magnesium content, had a dominant effect on the strengthening of the weld.
Highlights
Aluminum 5XXX alloys have excellent strength, weldability, and corrosion resistance and are widely used in the ship, vehicle, and plant industries [1,2,3]
Kim et al [7] reported that, when gas metal arc (GMA) welding was performed on an aluminum 5083 alloy using a commercial filler wire (Mg 5.10 wt.%) and a filler wire manufactured with a higher magnesium content (Mg 5.98 wt.%), the strength of the weld using the filler wire with a high magnesium content was higher
This study investigates the effect of magnesium and manganese contents on the mechanical properties of GMA welds of aluminum alloys
Summary
Aluminum 5XXX alloys have excellent strength, weldability, and corrosion resistance and are widely used in the ship, vehicle, and plant industries [1,2,3]. Kim et al [7] reported that, when gas metal arc (GMA) welding was performed on an aluminum 5083 alloy using a commercial filler wire (Mg 5.10 wt.%) and a filler wire manufactured with a higher magnesium content (Mg 5.98 wt.%), the strength of the weld using the filler wire with a high magnesium content was higher. There has been no research confirming whether the magnesium content and mechanical properties are proportional when high-current arc welding is performed using a filler wire with higher magnesium content (7 wt.% or more). The boiling point of manganese is 2090 ◦C, which is higher than the arc-melting pool temperature and volumetric temperature in the aforementioned studies of Ismail [11] and Wang [12]. The microstructure and chemical composition were analyzed to compare changes in the welds according to their magnesium and manganese contents
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