The Effect of Process Parameters on the Microstructure and Mechanical Properties of AW5083 Aluminum Laser Weld Joints

Abstract

In this article, the effect of process parameters on the microstructure and mechanical properties of AW5083 aluminum alloy weld joints welded by a disk laser were studied. Butt welds were produced using 5087 (AlMg4.5MnZr) filler wire, with a diameter of 1.2 mm, and were protected from the ambient atmosphere by a mixture of argon and 30 vol.% of helium (Aluline He30). The widest weld joint (4.69 mm) and the highest tensile strength (309 MPa) were observed when a 30 L/min shielding gas flow rate was used. Conversely, the narrowest weld joint (4.15 mm) and the lowest tensile strength (160 MPa) were found when no shielding gas was used. The lowest average microhardness (55.4 HV0.1) was recorded when a 30 L/min shielding gas flow rate was used. The highest average microhardness (63.9 HV0.1) was observed when no shielding gas was used. In addition to the intermetallic compounds, β-Al3Mg2 and γ-Al12Mg17, in the inter-dendritic areas of the fusion zone (FZ), Al49Mg32, which has an irregular shape, was recorded. The application of the filler wire, which contains zirconium, resulted in grain refinement in the fusion zone. The protected weld joint was characterized by a ductile fracture in the base material (BM). A brittle fracture of the unshielded weld joint was caused by the presence of Al2O3 particles. The research results show that we achieved the optimal welding parameters, because no cracks and pores were present in the shielded weld metal (WM).

Application of integrated CRITIC and GRA-based Taguchi method for multiple quality characteristics optimization in laser-welded blanks

“…The findings corroborate with the study by Vyskoč et al. [ 36 ] who stated that the weld width slightly decreased with a reduced gas flow rate.…”

Exploring the Potential Application of an Innovative Post-Weld Finishing Method in Butt-Welded Joints of Stainless Steels and Aluminum Alloys

“…In the next stage of the study, metallographic analysis [17,39] was conducted to assess changes in the microstructure [40,41], microhardness [42], and degree of hardening within the surface layer [43] induced by the application of the innovative post-weld finishing method.…”

Simulation on temperature field in laser deep penetration welding of 1050/6061 aluminum alloy

“…During welding, aluminum alloy materials for power battery lugs are prone to defects such as cracks, undercuts, dents, and pores, which affect welding quality [3,4] . Laser welding Laser welding has the characteristics of narrow heat affected zone, fast welding speed, degree of automation, small welding deformation, etc., and is suitable for welding between aluminum alloys of power batteries [5][6][7] . At the same time, the rapid development of finite element simulation technology has greatly shortened the selection process of laser welding test parameters [8,9] .…”