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董继红, 佟建华, 郭晓娟, 栾国红. 30 mm 7A05铝合金搅拌摩擦焊接头组织及力学性能[J]. 焊接学报, 2012, (4): 65-68.
引用本文: 董继红, 佟建华, 郭晓娟, 栾国红. 30 mm 7A05铝合金搅拌摩擦焊接头组织及力学性能[J]. 焊接学报, 2012, (4): 65-68.
DONG Jihong, TONG Jianhua, GUO Xiaojuan, LUAN Guohong. Microstructure and mechanical properties of friction stir welding joint of 7A05 aluminum alloy thick-sheet[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2012, (4): 65-68.
Citation: DONG Jihong, TONG Jianhua, GUO Xiaojuan, LUAN Guohong. Microstructure and mechanical properties of friction stir welding joint of 7A05 aluminum alloy thick-sheet[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2012, (4): 65-68.

30 mm 7A05铝合金搅拌摩擦焊接头组织及力学性能

Microstructure and mechanical properties of friction stir welding joint of 7A05 aluminum alloy thick-sheet

  • 摘要: 采用搅拌摩擦焊方法利用新型搅拌头对30 mm厚的7A05-T6铝合金进行了单道对接,焊后分析讨论了焊缝接头微观组织和力学性能.结果表明,接头焊核区发生动态再结晶,生成细小的等轴晶粒;焊缝两侧热力影响区受机械和热的双重作用,组织存在较大差异,前进侧为窄条状组织,后退侧为扁平状组织;热影响区晶粒粗化;在焊接30 mm板时,工艺参数范围较窄,旋转频率为360 r/min,焊接速度为100 mm/min时,可获得无缺陷、成形好的焊缝;接头抗拉强度为367.7 MPa、屈服强度为280.8 MPa、断后伸长率为14.4%高于母材,接头抗拉强度可达母材的95%.接头显微硬度的分布呈类似W形分布,热影响区软化趋势比较明显.

     

    Abstract: A new style stir head was designed to weld high strength aluminum alloy plate of 30mm thickness with friction stir welding.Microstructure and mechanical properties of friction stir welded joint of 7A05-T6 aluminum alloy thick plate were investigated.The results show that the dynamic recrystallization takes place in the weld nugget zone and fine grains are formed.Regarding to the thermo-mechanically affected zone on the sides,the advancing side consists of narrow slate grains,while the retreating side consists of flat and nubby grains.The adjusting range of process parameters is very narrow for welding of 30mm plate.When the rotating speed was 360 r/min and welding speed was 120 mm/min,the defect-free weld with good appearance was obtained,and the tensile strength of the weld reached 367.7 MPa,yield strength reached 280.8 MPa and the elongation reached 14.4%.Tensile strength of the weld could reach up to 95% of the base metal,and the elongation was higher than that of the base metal.

     

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