Numerical Simulation and Experimental Study on the TIG (A-TIG) Welding of Dissimilar Magnesium Alloys

Qin, Bo; Qu, Rui; Xie, Yizhen; Liu, Sheng

doi:10.3390/ma15144922

Cited by 8 publications

(2 citation statements)

References 25 publications

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“…Where μ denotes to the friction coefficient, r p denotes to the radius of the tool pin, ω denotes to the angular velocity (rad/s), and Ybar(T) refers to the temperature dependent shear stress of the Al and Mg material. The temperature dependent properties required for the simulations are considered from the previous report [28,29].…”

Section: Numerical Analysismentioning

confidence: 99%

Experimental and numerical analysis of intermetallics in Al–Mg friction stir welds

Naveenkumar,

Subramanian,

Ranjith

2023

Mater. Res. Express

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In this research work, it was aimed to analyse the thermal behaviour during FSW in order to understand the diffusion behaviour of Al (AA6061)-Mg (AZ31B) dissimilar joints. Three heat input levels at different weld pitch ratios (WPR) of 0.087, 0.068 and 0.051 are accounted for the analysis. Finite element modelling (FEM) is employed to predict temperature evolutions. From the FEM results and fundamental diffusion equations, the intermetallic thickness and the diffusion behaviour between the Al and Mg material were analyzed and found that the Al-rich intermetallic phases Al3Mg2 grow faster and wider than the Mg-rich phase Al12Mg17. Tensile test demonstrates that a lower welding pitch ratio (WPR) leads to the formation of thicker intermetallic layers, resulting in reduced tensile strength and joint efficiency. In contrast, a higher WPR (0.087) minimizes intermetallic thickness, yielding superior tensile properties (138mpa). Microhardness measurements at the stir zone reveal a broad range from 70 to 164 HV, signifying mechanical heterogeneity. Microstructural reveals that a complex interplay between Al and Mg materials, resulting in fine equiaxed grains, intermetallic compounds, and distinct flow patterns in the stir zone.

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Section: Numerical Analysismentioning

confidence: 99%

Experimental and numerical analysis of intermetallics in Al–Mg friction stir welds

Naveenkumar,

Subramanian,

Ranjith

2023

Mater. Res. Express

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“…Magnesium alloys are commonly utilized in the aviation, automotive, and medical industries, as well as many others [33,34]. Joining elements made of Mg alloys is typically achieved with laser welding [35][36][37] and other fusion welding methods (e.g., TIG [38]).…”

Section: Al Zn Mnmentioning

confidence: 99%

Comprehensive Research of FSW Joints of AZ91 Magnesium Alloy

et al. 2023

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For the friction stir welding (FSW) of AZ91 magnesium alloy, low tool rotational speeds and increased tool linear speeds (ratio 3.2) along with a larger diameter shoulder and pin are utilized. The research focused on the influence of welding forces and the characterization of the welds by light microscopy, scanning electron microscopy with an electron backscatter diffraction system (SEM-EBSD), hardness distribution across the joint cross-section, joint tensile strength, and SEM examination of fractured specimens after tensile tests. The micromechanical static tensile tests performed are unique and reveal the material strength distribution within the joint. A numerical model of the temperature distribution and material flow during joining is also presented. The work demonstrates that a good-quality joint can be obtained. A fine microstructure is formed at the weld face, containing larger precipitates of the intermetallic phase, while the weld nugget comprises larger grains. The numerical simulation correlates well with experimental measurements. On the advancing side, the hardness (approx. 60 HV0.1) and strength (approx. 150 MPa) of the weld are lower, which is also related to the lower plasticity of this region of the joint. The strength (approx. 300 MPa) in some micro-areas is significantly higher than that of the overall joint (204 MPa). This is primarily attributable to the macroscopic sample also containing material in the as-cast state, i.e., unwrought. The microprobe therefore includes less potential crack nucleation mechanisms, such as microsegregations and microshrinkage.

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Effects of Welding Speed and Welding Current on the Residual Stress and Deformation of SAF 2507/316L Dissimilar Plasma Arc Welding

Hong,

Huang,

et al. 2023

J. of Materi Eng and Perform

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Numerical Simulation and Experimental Study on the TIG (A-TIG) Welding of Dissimilar Magnesium Alloys

Cited by 8 publications

References 25 publications

Experimental and numerical analysis of intermetallics in Al–Mg friction stir welds

Experimental and numerical analysis of intermetallics in Al–Mg friction stir welds

Comprehensive Research of FSW Joints of AZ91 Magnesium Alloy

Effects of Welding Speed and Welding Current on the Residual Stress and Deformation of SAF 2507/316L Dissimilar Plasma Arc Welding

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