若参数选择不当，焊核中心区出现了颗粒消失现象。
The reinforcement particles might disappear if the welding parameters were inappropriate.
其中，焊核为明显的再结晶等轴晶粒，晶粒明显细化；
The weld nugget had a dynamic recrystallized, fine isometric crystal structure.
研究表明，高频信号幅度值随焊核直径和接头强度的增加而下降。
It is indicated that the high frequency amplitude of the signals is decreased with the increase of spot size and strength of joints.
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