FE analysis of metal flow and weld seam formation in a porthole die during the extrusion of a magnesium alloy into a square tube and the effect of ram speed on weld strength

Liu, Gang; Zhou, Jie; Duszczyk, J.

doi:10.1016/j.jmatprotec.2007.09.032

Cited by 93 publications

(46 citation statements)

References 16 publications

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“…Besides the extrusion and material parameters, the die and profile geometry as well as post-extrusion treatments distinctly influence the quality of weld seams. In particular, the distribution of temperature, stress and strain as well as the contact time in the welding chamber play an important role to control the solid-state bonding process [5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Characterization of weld seam properties of extruded magnesium hollow profiles

et al. 2016

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Extrusions of hollow profiles with weld seams were conducted using the magnesium alloy ME21 applying various extrusion ratios. Subsequent analysis of the profiles' microstructure was performed comparing weld free with weld seam containing material using (polarized) light optical microscopy (LOM). Additionally, the local texture and microstructure in the weld-free material as well as in the weld seam region has been examined with a scanning electron microscope coupled with electron backscatter diffraction technique (SEM-EBSD). The weld-free material and the weld seam are characterized by recrystallized microstructures, whereas few residual cast grains were identified. The local texture distinctively changes from the weld-free material to the weld seam. The texture of the weld-free material is comparable with the typical ME21 sheet texture. In the weld seam area, a pole density is found, which is distributed towards the transverse direction (TD) combined with a split and broadening of the pole density in the extrusion direction (ED). This texture influences the mechanical anisotropy due to the dependence of the activation of basal hai-slip and f1012g h10 11i-extension twinning on the loading direction in favorably oriented grains.

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Section: Introductionmentioning

confidence: 99%

Characterization of weld seam properties of extruded magnesium hollow profiles

et al. 2016

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“…If the appropriate conditions of temperature and pressure are achieved, the welding process takes place in a solid state condition. Welding lines in the longitudinal extruded profiles are determined and the quality of the extruded joints is closely related to the efficiency of the mechanical longitudinal welds [3]. Accumulative Roll Bonding (ARB) is a process in which two sheets metal are overlapped and rolled with thickness reduction of 50 % [4].…”

Section: Introductionmentioning

confidence: 99%

Comparative analysis of bonding mechanism in solid state metal working processes

et al. 2016

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Abstract. The Piwnik and Plata pressure-time bonding criterion was applied to Friction Stir Welding, Linear Friction Welding, Porthole Extrusion and Roll Bonding. A neural network was set up, trained and used to predict the bonding occurrence starting from the main field variable distributions calculated through specific numerical models developed for each process. The analysis of the results permitted to predict the occurrence of solid bonding and to highlight differences and analogies between the processes in order to obtain sound solid welds.

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“…Nowadays, complex profiles made of lightweight materials, such as aluminium or magnesium alloys, are produced largely by extrusion processes [1]. In particular, the extrusion with a porthole die is the most widespread manufacturing process as it allows to manufacture hollow profiles with complex shapes [2,3].…”

Section: Introductionmentioning

confidence: 99%

Dynamic DOE for porthole die extrusion optimisation

et al. 2016

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Abstract. Extruded profiles are widely used but their design is still difficult. Several parameters have to be considered. This is particularly true when complex geometries, i.e. non-symmetric or hollow profiles have to be obtained. A novel metamodel technique was proposed to define the relationship between input and output process parameters in porthole die extrusion. An iterative dynamic DOE was finally used to improve the accuracy of the model around the most promising area of the process domain.

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FE analysis of metal flow and weld seam formation in a porthole die during the extrusion of a magnesium alloy into a square tube and the effect of ram speed on weld strength

Cited by 93 publications

References 16 publications

Characterization of weld seam properties of extruded magnesium hollow profiles

Characterization of weld seam properties of extruded magnesium hollow profiles

Comparative analysis of bonding mechanism in solid state metal working processes

Dynamic DOE for porthole die extrusion optimisation

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