焊点熔核
The micro analysis demonstrate that the cross section of FSW joint can be divided into weld nugget zone, thermal mechanically affected zone, heat affected zone and base metal.
通过对接头微观组织分析表明,接头横截面由焊核区、热机影响区、热影响区和母材区组成。
The average value of hardness in weld nugget could fall;
焊核区平均硬度随转速增加而下降;
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