FRICTION STIR WELDING OF AZ31 MAGNESIUM ALLOY

Zhang Hua  Wu Lin   Lin Sanbao  Feng Jicai

(State Key Lab of Advanced Welding Production Technology, Harbin Institute of Technology, Harbin 150001)

Guo Heping

(Department of Metal Forming, Beijing Aeronautical Manufacturing Technology Research Institute, Beijing 100024)

Abstract: A series of controlled friction stir welds are manufactured successfully using 2.5 mm thick AZ31 magnesium rolled sheet material. The results show that the top surfaces of friction stirred welds are smooth and no crack and the bottom surfaces are full penetration. Results from metallurgical, micro-hardness, tensile and bend measurements clearly show that the friction stir welding process can create a segregated banded microstructure and high quality joints. (The ultimate tensile strength canreach to 90% of base metal) The weld nugget is consisted of fine, equaixed grain.

Key words: Friction stir welding  AZ31 magnesium alloy Microstructure  Mechanical properties  Micro-hardness

CLC No: TG453

国家高技术研究发展基金 (2002AA331160). Received 20030417, received in revised form 20040107