Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报

ZHONGGUO YOUSEJINSHU XUEBAO

第22卷    第1期    总第154期    2012年1月

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文章编号:1004-0609(2012)1-0062-10
伸缩式搅拌头厚铝板搅拌摩擦焊缺陷及其补焊工艺
李  博1,沈以赴1,胡伟叶1, 2

(1. 南京航空航天大学 材料科学与技术学院,南京 210016;
2. 中国航天科工集团 南京晨光厂 工艺研究所,南京210012
)

摘 要: 采用伸缩式搅拌头对25 mm板厚2219-T6铝合金进行搅拌摩擦焊,在多道补焊时避免搅拌头轴肩的二次下压量造成的底部焊穿。对25 mm板厚2219-T6搅拌摩擦焊焊缝的微观组织、材料缺失型缺陷及弱连接型缺陷进行观察。结果表明:焊缝沿厚度方向分为轴肩影响区和搅拌针影响区,焊接参数的变化与这两区域中缺陷的产生存在一定关系,焊缝中的材料缺失型缺陷遵循一定的体积守恒关系。利用伸缩式搅拌头制备不同尺寸的焊缝根部未焊透缺陷,发现未焊透的深度与焊缝抗拉强度呈非线性关系。在统一的焊接参数规范下,调整搅拌针伸出长度进行多道焊,研究多道补焊工艺对焊缝组织性能的影响。

 

关键字: 2219铝合金;搅拌摩擦焊;焊缝缺陷;伸缩式搅拌头;多道焊

Friction-stir welded defects and repairing weld process of
thick aluminum plates with telescopic stir-pin
LI Bo1, SHEN Yi-fu1, HU Wei-ye1, 2

1. College of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics,
Nanjing 210016, China;
2. Technology Research Institute of Nanjing Chenguang Corporation,
China Aerospace Science and Technology Corporation, Nanjing 210012, China

Abstract:By using the telescopic stir-pin, 25 mm-thickness 2219-T6 aluminum alloy couple plates were successfully friction-stir welded, and no plunge-through defect induced by the press amount of tool-shoulder was observed in the multi-pass repairing welding process. The microstructures in sound friction-stir welds, material-loss typed and weak-link typed weld defects were observed. The results show that the weld along the weld-thickness direction can be divided into shoulder-affected and pin-affected zones. The formation of defects is associated with the change of the welding parameters, and the inner material-loss typed defects follow volume conservation relationship. For the welds with different-size root flaws prepared by telescopic stir-pin, a non-linear relationship exists between the root-flaw depth and the weld tensile strength. In addition, under the unified welding parameters, by adjusting the telescopic pin length, the effects of multi-pass welding on the microstructure and properties of the resultant welds were investigated.

 

Key words: 2219 aluminum alloy; friction stir welding; weld defect; telescopic stir-pin; multi-pass welding

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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