The weld nugget had a dynamic recrystallized, fine isometriccrystal structure.
其中，焊核为明显的再结晶等轴晶粒，晶粒明显细化；
2
The microstructure of the welded joints was studied by optical microscopy. It is found that the weld nugget has a dynamic recrystallization, fine isometriccrystal structure.