Influence of pin size on welding shape and mechanical properties of friction stir welded 2014 Al alloy

来源期刊：中国有色金属学报(英文版)2005年第z2期

论文作者：赵衍华 林三宝 吴林 曲福兴

文章页码：92 - 96

Key words：2014 Al alloy； friction stir pin； friction stir welding； shape； mechanical property

Abstract: The influence of pin size on microstructure and mechanical properties of friction stir welded 2014 Al alloy was investigated. Three different size stir pins were used to carry out the welding process. The results show that the size of the pin has a significant effects on the joint structure and mechanical properties. For one given thickness material, excellent weld can be achieved by using a appropriate size friction stir tool. The appearance of the weld is good and no obvious defect is found using this tool. The grain of the weld nugget is very fine and the precipitation distributes equably. The weld structure can change smoothly from the weld nugget to the thermo-mechanic affected zone. The tensile strength is high enough and the synthesis mechanical properties of the weld are very good. When welded by an improper size pin, some defects such as voids and crack often occur in the weld, and which strongly affect the mechanical properties of the weld.