Analysis of solidified organism in thin piece spot welding nugget
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Graphical Abstract
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Abstract
Accordinq to the research on spot welding nugget system of thin metalpieces,two kinds of solidified organism may exist in the nugget: "columnar" and "columnar+cquiaxial" structure,and the micro-structure is generally dendritie.Athird solidifled organism,the single equiaxial organism,was got for the first time byincubating the nugget.
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