The effect of die design on the production and seam weld quality of extruded aluminum profiles

Donati, Lorenzo; Tomesani, Luca

doi:10.1016/j.jmatprotec.2005.02.156

Cited by 87 publications

(41 citation statements)

References 4 publications

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“…Donati et al [9,10] designed special 'seam weld dies' to extrude I-shaped sections with a weld seam in the middle to facilitate subsequent mechanical testing. Den Bakker et al [11] investigated the flow-related defects in connection with different aluminum alloys and developed model dies for the investigation of weld seam formation during the extrusion of hollow profiles.…”

Section: Introductionmentioning

confidence: 99%

Physical Simulation Method for the Investigation of Weld Seam Formation During the Extrusion of Aluminum Alloys

Fang

Nguyen

Zhou

2016

JOM

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Extrusion through porthole die is a predominant forming process used in the production of hollow aluminum alloy profiles across the aluminum extrusion industry. Longitudinal weld seams formed during the process may negatively influence the quality of extruded profiles. It is therefore of great importance to understand the formation of weld seams inside the welding chamber during extrusion, as affected by extrusion process variables and die design. Previously developed physical simulation methods could not fully reproduce the thermomechanical conditions inside the welding chamber of porthole die. In this research, a novel physical simulation method for the investigation of weld seam formation during extrusion was developed. With a tailor-designed tooling set mounted on a universal testing machine, the effects of temperature, speed and strain on the weld seam quality of the 6063 alloy were investigated. The strains inside the welding chamber were found to be of paramount importance for the bonding of metal streams, accompanied by microstructural changes, i.e., recovery or recrystallization, depending on the local deformation condition. The method was shown to be able to provide guidelines for the design of porthole dies and choice of extrusion process variables, thereby reducing the scrap rate of aluminum extrusion operation.

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Section: Introductionmentioning

confidence: 99%

Physical Simulation Method for the Investigation of Weld Seam Formation During the Extrusion of Aluminum Alloys

Fang

Nguyen

Zhou

2016

JOM

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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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“…Figure 1 The extrusion welding process showing the seam weld and charge weld in a longitudinal direction [2] The performance inspection and structural characterization of extrusion welds made in porthole dies have been studied by many investigators. Pietro et al [4], Donati and Tomesani [5] and Ceretti et al [6] investigated the die design solutions for the production of extruded sections without forming longitudinal weld streaks in architecturally finished parts. Loukus et al [7], Engelhardt et al [8] and Oosterkamp et al [9] studied the mechanical properties of the welded regions in detail, and revealed that the welded region is less ductile than the regions away from the welds.…”

Section: Introductionmentioning

confidence: 99%

Microstructural Characterization of Extrusion Welds in 6xxx Aluminum alloys

Ren¹,

Zhang

et al. 2015

Proceedings of the 3rd International Conference on Material, Mechanical and Manufacturing Engineering

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In this study, the microstructure of extrusion welds (including charge welds and seam welds) in a curtain wall hollow profile made of 6063 alloy is investigated using both Optical and Scanning Electron Microscopy (OM & SEM, respectively). The grain size and the morphology, size and distribution of particles were different in seam weld, charge weld and matrix, due to variations in thermal deformation and recrystallization. Meanwhile, the relation of microstructural to the anodized streaks is also discussed. Considering both the practical extrusion process and reported literatures, the most important factors among the numerous extrusion parameters are analyzed.

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The effect of die design on the production and seam weld quality of extruded aluminum profiles

Cited by 87 publications

References 4 publications

Physical Simulation Method for the Investigation of Weld Seam Formation During the Extrusion of Aluminum Alloys

Physical Simulation Method for the Investigation of Weld Seam Formation During the Extrusion of Aluminum Alloys

Characterization of weld seam properties of extruded magnesium hollow profiles

Microstructural Characterization of Extrusion Welds in 6xxx Aluminum alloys

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