| Effects of shoulder on interfacial bonding during friction stir lap welding of aluminum thin sheets using tool without pin |
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| 作者姓名： | 张贵锋 ;苏伟 ;张军 ;韦中新 ;张建勋 |
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| 作者单位： | [1]State Key Laboratory for Mechanical Behavior of Materials, Xi＇an Jiaotong University, Xi＇an 710049, China; [2]Inspection Institute for Special Equipment, Nanning 530022, China |
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| 摘 要： | To separately investigate the potential effects of shoulder on increasing interfacial bonded area and its mechanism,friction stir lap welding(FSLW)of 1.8 mm thick Al sheets without and with insert(copper foil or Al-12Si powders)was conducted using a special tool without pin,respectively.All the FSLW joints(without insert)fractured within top sheet but not along faying surface,suggesting that the shoulder plays an important role comparable or superior to pin in FSLW of thin sheets.Using several specially designed experimental techniques,the presence of forging and torsion actions of shoulder was demonstrated.The fracture surface of the joints with inserts indicates that interfacial wear occurs,which results in the oxide film disruption and vertically interfacial mixing over the area forged by shoulder with a larger diameter than a general pin,especially at the boundary region of weld.The boundary effect can be induced and enhanced by forging effect and torsion effect.
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| 关 键 词： | friction stir lap welding forging action torsion action boundary effect interfacial wear oxide disruption |
| 收稿时间： | 22 December 2009 |
Effects of shoulder on interfacial bonding during friction stir lap welding of aluminum thin sheets using tool without pin |
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| Gui-feng ZHANG, Wei SU, Jun ZHANG, Zhong-xin WEI,Jian-xun ZHANG.Effects of shoulder on interfacial bonding during friction stir lap welding of aluminum thin sheets using tool without pin[J].Transactions of Nonferrous Metals Society of China,2010,20(12):2223-2228. |
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| Authors: | Gui-feng ZHANG Wei SU Jun ZHANG Zhong-xin WEI Jian-xun ZHANG |
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| Affiliation: | a State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an 710049, China;b Inspection Institute for Special Equipment, Nanning 530022, China |
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| Abstract: | To separately investigate the potential effects of shoulder on increasing interfacial bonded area and its mechanism, friction stir lap welding (FSLW) of 1.8 mm thick Al sheets without and with insert (copper foil or Al-12Si powders) was conducted using a special tool without pin, respectively. All the FSLW joints (without insert) fractured within top sheet but not along faying surface, suggesting that the shoulder plays an important role comparable or superior to pin in FSLW of thin sheets. Using several specially designed experimental techniques, the presence of forging and torsion actions of shoulder was demonstrated. The fracture surface of the joints with inserts indicates that interfacial wear occurs, which results in the oxide film disruption and vertically interfacial mixing over the area forged by shoulder with a larger diameter than a general pin, especially at the boundary region of weld. The boundary effect can be induced and enhanced by forging effect and torsion effect. |
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| Keywords: | friction stir lap welding forging action torsion action boundary effect interfacial wear oxide disruption |
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