The fine grain and narrow HAZ were found in frictionstir weld and the dynamic recrystallization produces fine grain.
焊核区由于动态再结晶具有细小的等轴晶粒，旁边存在一个特殊的组织形貌——热机影响区域。
2
The experiment result shows that the spacing of onion rings, which is the most prominent features of most frictionstir welds, decreases with the distance of onion ring to centerline increasing .
With the increase of the translation velocity of the pin, the flow of the material in frictionstir welding becomes faster but the equivalent plastic strain decreases.