Effect of welding speed on the material flow patterns in friction stir welding of AZ31 magnesium alloy  

作　　者：ZHANG Hua Wu Huiqiang Huang Jihua LIN Sanbao WU Lin 

机构地区：[1]Materials Science and Engineering School, University of Science and Technology Beijing, Beijing 100083, China [2]Beijing Institute of Astronautical Systems Engineering, Beijing 100076, China [3]State Key Lab of Advanced Welding Production Technology, Harbin Institute of Technology, Harbin 150001, China

出　　处：《Rare Metals》2007年第2期158-162,共5页稀有金属（英文版）

基　　金：This project was financially supported by the National "863" Project Foundation of China (No. 2002AA331160).

摘　　要：The clear zigzag-line pattern on transverse cross sections can be used to explain the formation mechanism of the weld nugget when friction stir welded AZ31 magnesium alloy without any other insert material is used as mark. It provides a simple and useful method to research the joining mechanism of friction stir welding. The rotation speed is kept at 1000 r/min and the welding speed changes from 120 mm/min to 600 mm/min. The macrostructure on the transverse cross section was divided into several parts by faying surface. The results show that the shape and formation procedure of the weld nugget change with the welding speed. There are two main material flows in the weld nugget： one is from the advancing side and the other is from the retreating side. A simple model on the weld nugget formation of FSW is presented in this article.The clear zigzag-line pattern on transverse cross sections can be used to explain the formation mechanism of the weld nugget when friction stir welded AZ31 magnesium alloy without any other insert material is used as mark. It provides a simple and useful method to research the joining mechanism of friction stir welding. The rotation speed is kept at 1000 r/min and the welding speed changes from 120 mm/min to 600 mm/min. The macrostructure on the transverse cross section was divided into several parts by faying surface. The results show that the shape and formation procedure of the weld nugget change with the welding speed. There are two main material flows in the weld nugget： one is from the advancing side and the other is from the retreating side. A simple model on the weld nugget formation of FSW is presented in this article.

关 键 词：AZ31 magnesium alloy friction stir welding faying surface materials flow formation model 

分 类 号：TG453.9[金属学及工艺—焊接]