The Experts below are selected from a list of 40215 Experts worldwide ranked by ideXlab platform
Z Y - One of the best experts on this subject based on the ideXlab platform.
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effect of welding parameters on tensile properties and Fracture behavior of friction stir welded al mg si alloy
Scripta Materialia, 2007Co-Authors: Z Y, L Q ChenAbstract:Al-Mg-Si alloy plates friction stir welded at a tool traverse speed of 400 mm/min exhibited higher tensile strength with 45 degrees Shear Fracture, whereas lower tensile strengths with nearly vertical Fractures were observed for samples welded at a lower speed of 100 mm/min. The Fracture paths corresponded well with the lowest hardness distribution profiles in the joints. The heat indexes cannot be used as parameters to evaluate the thermal input, mechanical properties and Fracture mode. (c) 2006 Published by Elsevier Ltd. on behalf of Acta Materialia Inc.
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effect of welding parameters on tensile properties and Fracture behavior of friction stir welded al mg si alloy
Scripta Materialia, 2007Co-Authors: Z Y, Ling CheAbstract:Al-Mg-Si alloy plates friction stir welded at a tool traverse speed of 400 mm/min exhibited higher tensile strength with 45 degrees Shear Fracture, whereas lower tensile strengths with nearly vertical Fractures were observed for samples welded at a lower speed of 100 mm/min. The Fracture paths corresponded well with the lowest hardness distribution profiles in the joints. The heat indexes cannot be used as parameters to evaluate the thermal input, mechanical properties and Fracture mode. (c) 2006 Published by Elsevier Ltd. on behalf of Acta Materialia Inc.
L Q Chen - One of the best experts on this subject based on the ideXlab platform.
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effect of welding parameters on tensile properties and Fracture behavior of friction stir welded al mg si alloy
Scripta Materialia, 2007Co-Authors: Z Y, L Q ChenAbstract:Al-Mg-Si alloy plates friction stir welded at a tool traverse speed of 400 mm/min exhibited higher tensile strength with 45 degrees Shear Fracture, whereas lower tensile strengths with nearly vertical Fractures were observed for samples welded at a lower speed of 100 mm/min. The Fracture paths corresponded well with the lowest hardness distribution profiles in the joints. The heat indexes cannot be used as parameters to evaluate the thermal input, mechanical properties and Fracture mode. (c) 2006 Published by Elsevier Ltd. on behalf of Acta Materialia Inc.
Ling Che - One of the best experts on this subject based on the ideXlab platform.
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effect of welding parameters on tensile properties and Fracture behavior of friction stir welded al mg si alloy
Scripta Materialia, 2007Co-Authors: Z Y, Ling CheAbstract:Al-Mg-Si alloy plates friction stir welded at a tool traverse speed of 400 mm/min exhibited higher tensile strength with 45 degrees Shear Fracture, whereas lower tensile strengths with nearly vertical Fractures were observed for samples welded at a lower speed of 100 mm/min. The Fracture paths corresponded well with the lowest hardness distribution profiles in the joints. The heat indexes cannot be used as parameters to evaluate the thermal input, mechanical properties and Fracture mode. (c) 2006 Published by Elsevier Ltd. on behalf of Acta Materialia Inc.
Keiro Tokaji - One of the best experts on this subject based on the ideXlab platform.
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a newly developed tool without probe for friction stir spot welding and its performance
Journal of Materials Processing Technology, 2010Co-Authors: Yasunari Tozaki, Yoshihiko Uematsu, Keiro TokajiAbstract:A newly developed tool for friction stir spot welding (FSSW) has been proposed, which has no probe, but a scroll groove on its shoulder surface (scroll tool). By use of this tool, FSSW has been performed on aluminium alloy 6061-T4 sheets and the potential of the tool was discussed in terms of weld structure and static strength of welds. The experimental observations showed that the scroll tool had comparable or superior performance to a conventional probe tool. It was confirmed that sound welding could be achieved without a probe hole, in which the scroll groove played significant roles in the stirring of the material and the shoulder plunge depth was the important processing variable. The maximum tensile-Shear strength of the welds made by the scroll tool was found to be 4.6 kN that was higher than that of the welds made by the probe tool and two different Fracture modes, Shear Fracture and plug Fracture, appeared depending on processing condition. The Shear Fracture took place at smaller shoulder plunge depths or at shorter tool holding times, while the plug Fracture occurred at larger shoulder plunge depths or at longer tool holding times. It was indicated that the tensile-Shear strength and associated Fracture modes were determined by two geometrical parameters in the weld zone.
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effect of re filling probe hole on tensile failure and fatigue behaviour of friction stir spot welded joints in al mg si alloy
International Journal of Fatigue, 2008Co-Authors: Yoshihiko Uematsu, Yasunari Tozaki, Keiro Tokaji, T Kurita, Shunsuke MurataAbstract:Abstract In this study, the fatigue behaviour of Al–Mg–Si aluminium alloy joints joined by friction stir spot welding (FSSW) was investigated. FSSW was performed using a specially designed double-acting tool consisting of outer flat shoulder and inner retractable probe, which could re-fill probe hole of the joints. Lap-Shear specimens with probe hole and re-filled one were fabricated. The tensile strength of the joint with re-filled hole was higher than that of the joint with probe hole, where Shear Fracture through the nugget occurred in both joints. The re-filling process increased effective cross sectional area of the nugget, resulting in higher tensile strength. Fatigue tests were conducted using lap-Shear specimens at a stress ratio of R = 0.1. The fatigue strength of the joint with re-filled probe hole was nearly the same as, but lower than, at low and high applied loads, respectively, that of the joint with probe hole. The pull out of the nugget, i.e., plug type Fracture, was seen in the joint with re-filled probe hole, while Shear Fracture through the nugget was observed in the joint with prove hole. The observation of fatigue crack growth path revealed that the plug type Fracture through the upper sheet was responsible for the observed lower fatigue strength of the joint with re-filled prove hole at high applied loads.
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effect of processing parameters on static strength of dissimilar friction stir spot welds between different aluminium alloys
Fatigue & Fracture of Engineering Materials & Structures, 2007Co-Authors: Yasunari Tozaki, Yoshihiko Uematsu, Keiro TokajiAbstract:The effect of processing parameters on static strength and Fracture mechanisms of dissimilar friction stir spot welds between different aluminium alloys was studied. Tensile Shear strength increased with decreasing tool rotational speed and increasing tool holding time, while cross tension strength decreased with increasing both parameters. Two Fracture modes were observed: nugget Shear Fracture and mixed mode Fracture under tensile Shear loading, and debonding and pull-out of the nugget under cross tension loading. Based on experimental observation, the dependence of static strength on processing parameters and the occurrence of different Fracture modes were discussed.
Yoshihiko Uematsu - One of the best experts on this subject based on the ideXlab platform.
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a newly developed tool without probe for friction stir spot welding and its performance
Journal of Materials Processing Technology, 2010Co-Authors: Yasunari Tozaki, Yoshihiko Uematsu, Keiro TokajiAbstract:A newly developed tool for friction stir spot welding (FSSW) has been proposed, which has no probe, but a scroll groove on its shoulder surface (scroll tool). By use of this tool, FSSW has been performed on aluminium alloy 6061-T4 sheets and the potential of the tool was discussed in terms of weld structure and static strength of welds. The experimental observations showed that the scroll tool had comparable or superior performance to a conventional probe tool. It was confirmed that sound welding could be achieved without a probe hole, in which the scroll groove played significant roles in the stirring of the material and the shoulder plunge depth was the important processing variable. The maximum tensile-Shear strength of the welds made by the scroll tool was found to be 4.6 kN that was higher than that of the welds made by the probe tool and two different Fracture modes, Shear Fracture and plug Fracture, appeared depending on processing condition. The Shear Fracture took place at smaller shoulder plunge depths or at shorter tool holding times, while the plug Fracture occurred at larger shoulder plunge depths or at longer tool holding times. It was indicated that the tensile-Shear strength and associated Fracture modes were determined by two geometrical parameters in the weld zone.
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effect of re filling probe hole on tensile failure and fatigue behaviour of friction stir spot welded joints in al mg si alloy
International Journal of Fatigue, 2008Co-Authors: Yoshihiko Uematsu, Yasunari Tozaki, Keiro Tokaji, T Kurita, Shunsuke MurataAbstract:Abstract In this study, the fatigue behaviour of Al–Mg–Si aluminium alloy joints joined by friction stir spot welding (FSSW) was investigated. FSSW was performed using a specially designed double-acting tool consisting of outer flat shoulder and inner retractable probe, which could re-fill probe hole of the joints. Lap-Shear specimens with probe hole and re-filled one were fabricated. The tensile strength of the joint with re-filled hole was higher than that of the joint with probe hole, where Shear Fracture through the nugget occurred in both joints. The re-filling process increased effective cross sectional area of the nugget, resulting in higher tensile strength. Fatigue tests were conducted using lap-Shear specimens at a stress ratio of R = 0.1. The fatigue strength of the joint with re-filled probe hole was nearly the same as, but lower than, at low and high applied loads, respectively, that of the joint with probe hole. The pull out of the nugget, i.e., plug type Fracture, was seen in the joint with re-filled probe hole, while Shear Fracture through the nugget was observed in the joint with prove hole. The observation of fatigue crack growth path revealed that the plug type Fracture through the upper sheet was responsible for the observed lower fatigue strength of the joint with re-filled prove hole at high applied loads.
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effect of processing parameters on static strength of dissimilar friction stir spot welds between different aluminium alloys
Fatigue & Fracture of Engineering Materials & Structures, 2007Co-Authors: Yasunari Tozaki, Yoshihiko Uematsu, Keiro TokajiAbstract:The effect of processing parameters on static strength and Fracture mechanisms of dissimilar friction stir spot welds between different aluminium alloys was studied. Tensile Shear strength increased with decreasing tool rotational speed and increasing tool holding time, while cross tension strength decreased with increasing both parameters. Two Fracture modes were observed: nugget Shear Fracture and mixed mode Fracture under tensile Shear loading, and debonding and pull-out of the nugget under cross tension loading. Based on experimental observation, the dependence of static strength on processing parameters and the occurrence of different Fracture modes were discussed.
