The weld nugget had a dynamic recrystallized, fine isometric crystal structure.
其中，焊核为明显的再结晶等轴晶粒，晶粒明显细化；
The microstructure of the welded joints was studied by optical microscopy. It is found that the weld nugget has a dynamic recrystallization, fine isometric crystal structure.
通过对焊接接头组织的分析，发现焊核区晶粒为明显的细化再结晶等轴晶；
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