| 引用本文: | 黎俊初,周德生,刘大海,刘鸽平.2A12铝合金筋板件T型搅拌摩擦焊工艺及焊后热处理[J].材料科学与工艺,2011,19(2):80-85,91.DOI:10.11951/j.issn.1005-0299.20110217. |
| LI Jun-chu,ZHOU De-sheng,LIU Da-hai,LIU Ge-ping.Friction stir welding and successive heat treatment of T-shaped rib-web parts of 2A12 aluminim alloy[J].Materials Science and Technology,2011,19(2):80-85,91.DOI:10.11951/j.issn.1005-0299.20110217. |
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| 摘要: |
| 为评价2A12铝合金筋板件搅拌摩擦焊工艺并探寻提高接头强度的途径,进行了2A12铝合金筋板件的T型搅拌摩擦焊焊接工艺试验,并对不同人工时效热处理下焊接接头的微观组织及性能进行了研究.研究表明:采用T型搅拌摩擦焊即可实现2A12铝合金筋板件的成形,当搅拌头旋转速度为750 r/min、焊接速度60 mm/min时,接头的抗拉强度达到了315 MPa,为母材强度的70.1%;断裂出现在前进侧热机影响区,硬度的最低处也在该区域,说明2A12铝合金搅拌摩擦焊接头的薄弱点在热机影响区.采用退火+固溶+分级时效热处理的方法能显著改善焊接接头的强度,接头的抗拉强度可达387 MPa,为母材的86.3%;焊接接头的薄弱点仍在前进侧的热机影响区. |
| 关键词: 2A12铝合金 搅拌摩擦焊 人工时效 热处理 |
| DOI：10.11951/j.issn.1005-0299.20110217 |
| 分类号:TG453.9 |
| 基金项目:轻合金科学与技术国防重点学科实验室资助项目(GF200901007) |
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| Friction stir welding and successive heat treatment of T-shaped rib-web parts of 2A12 aluminim alloy |
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LI Jun-chu, ZHOU De-sheng, LIU Da-hai, LIU Ge-ping
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Shool of Aeronautical Manufacturing Engineeing,Nanchang Hangkong University,Nanchang 330063,China
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| Abstract: |
| To evaluate the friction stir welding(FSW) technique of rib-web parts and to explore the ways of improving the joint strength,the T-shaped FSW process was conducted for the rib-web parts of 2A12 aluminum alloy,and the relative microstructure and mechanical property of welded joints were investigated before and after a series of aritificical aging processes.Results show that the T-shaped FSW technique alone can realize the formation of 2A12 aluminum alloy rib-web parts.And when the rotating speed of stirring joint is 750 r/min and the welding speed is 60 mm/min,the welded joints have a better tensile strength of 315 MPa that is 70.1% of that of the base metals,which are regarded as an ideal parameters under the experimental conditions.The fracture and the lowest hardness appear in the same location in the thermo-mechanically affected zone(TMAZ) of advancing side of joints,which is the weak point of friction stir welding joints for 2A12 aluminum alloy.The welded joints after heat treatment show that a significant improvement upon tensile strength can be observed by using a combined aging process of annealing,solution and step aging.The tensile strength of joints can reach 387 MPa,86.3% of that of the base metals.However,the weak point of joints is still located in the thermo-mechanically affected zone(TMAZ) of advancing side. |
| Key words: 2A12 aluminum alloy friction stir welding artificial aging heat treatment |
