Effects of current on nanoparticle reinforced magnesium alloy welding joints

Xie, Xiong; Shen, Jun; Gong, Fubao; Li, Y.

doi:10.1179/1362171815y.0000000055

Cited by 6 publications

(4 citation statements)

References 31 publications

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“…Figure 21 shows the velocity field distribution of the cross-section of the molten pool perpendicular to the welding direction during A-TIG welding of dissimilar magnesium alloys AZ61 and AM60. According to the studies of Xie et al [ 24 ] and Wu et al [ 25 ], during A-TIG welding with activating flux, the increase of penetration depth is mainly due to the influence of surface tension. Furthermore, the positive and negative temperature gradient has a great impact on the depth of the molten pool.…”

Section: Resultsmentioning

confidence: 99%

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

Qin

Xie

et al. 2022

Materials

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The welding experiments and numerical simulation analysis of dissimilar magnesium alloy AZ61-AM60 were carried out by TIG and A-TIG methods. The mathematical model of welding pool under three-dimensional transient moving heat source has been established, and the temperature field has been numerically simulated. The influence of welding process parameters on the surface forming quality of welded joints has been discussed. The simulation results show that temperature field distribution of dissimilar magnesium alloy AZ61-AM60 during the TIG welding process presents a certain asymmetry and the shape distribution of the melting field on both sides of the molten pool is asymmetrical. When A-TIG welding was coated with activating flux, the surface of the molten pool is ingot-shaped. These simulation results are verified through experiment investigation. The consistency between the experimental results and the simulation results reveals the variation law of temperature field and molten pool shape in the welding process, which provides an effective guidance for the optimization of welding process parameters of dissimilar magnesium alloys.

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Section: Resultsmentioning

confidence: 99%

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

Qin

Xie

et al. 2022

Materials

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“…However, the effect of nucleant particles on the Mg welds’ grain structure is not extensively studied yet. It is shown that the addition of SiC nano-particles to the flux in activating flux GTAW process can results in some grain refining in the FZ [87, 88]. It is of note that the pre-existing nucleant particles can induce grain refining during solidification.…”

Section: Grain Structure Of the Fusion Zone: Columnar-to-equiaxed Tra...mentioning

confidence: 99%

Critical review on fusion welding of magnesium alloys: metallurgical challenges and opportunities

Pouranvari

2021

Science and Technology of Welding and Joining

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As the lightest structural alloys, magnesium alloys offer significant potential for improving the energy efficiency of various transportation systems. The lack of sufficient weldability of Mg alloys is a crucial barrier to their potential use in safety-critical applications. Porosity formation, grain structure engineering, solidification cracking, liquation, and liquation cracking are the key metallurgical challenges to obtain reliable and robust fusion welds in Mg alloys. This critical review highlights the current understating regarding controlling the metallurgical phenomena during fusion welding of Mg alloys and discusses the unresolved metallurgical challenges to shed light on the path forward to enhance fusion weldability of Mg alloys.

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“…They go on to treat this problem theoretically using the type of heat and fluid flow models that are typical in fusion welding 8,9 ; indeed, the redistribution of non-melting particles is a favourite topic in the welding of metal matrix composites. 10 Additive manufacturing can be used to create structures that are otherwise impossible or nearly impossible to make using traditional technologies. One example is the so-called lattice or cell structures of interconnected struts.…”

mentioning

confidence: 99%

“…They go on to treat this problem theoretically using the type of heat and ﬂuid ﬂow models that are typical in fusion welding 8,9 ; indeed, the redistribution of non-melting particles is a favourite topic in the welding of metal matrix composites. 10…”

mentioning

confidence: 99%

Additive manufacturing

Bhadeshia

2016

Materials Science and Technology

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The idea that a component can be built up from nothing using a form of printing is not new. Rapid prototyping preceded the term additive manufacturing. For example, large, intricate prototypes have in the past routinely been made by coupling a computer aided design to a welding robot so that a component can be built for testing before creating the technology for mass manufacture. But the subject has now exploded with great effort being devoted to machines capable of depositing polymer or metal powders in order to create components, with the ultimate intention of introducing new manufacturing methods and accelerating the development of products.Selective laser melting (SLM) involves the fusion of metallic powders in successive layers according to a virtual model, using laser energy in the hope that an almost full-density component is achieved with little porosity. 1 The final component will not necessarily have the desired chemical composition because impurities such as oxygen are likely to be incorporated at concentrations greater than using conventional casting processes. The subject is young in this respect because the microstructural and mechanical integrity of components made using additive manufacturing remains to be established. Unlike conventional casting, there are no simple rules and no established software to enable choices to be made prior to making a component using SLA. Thus, Carter et al. 2 show that while in the case of nickel-based superalloys, the energy density can be used as a parameter to control powder consolidation, the tendency for macroscopic cracking of the resulting product does not correlate with that parameter. While it is reasonable to expect the full-density consolidation of metallic powder to depend on the energy input by the laser, the cracking behaviour illustrated by Carter et al. 2 seems brittle and hence post-solidification, in which case it is unlikely to depend on energy density alone. This clearly is a case where metallurgical characterisation to understand the failure mechanism is required.

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Effects of current on nanoparticle reinforced magnesium alloy welding joints

Cited by 6 publications

References 31 publications

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

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

Critical review on fusion welding of magnesium alloys: metallurgical challenges and opportunities

Additive manufacturing

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