This kind of welding makes the change of the aggregative structure in seam zone thus resulting in a slightly better strength in this zone than in the matrix.

热板焊接导致了焊缝区的聚态结构发生变化，从而使焊接接头的强度略高于母体强度。

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This kind of welding makes the change of the aggregative structure in seam zone thus resulting in a slightly better strength in this zone than in the matrix.

热板焊接导致了焊缝区的聚态结构发生变化，从而使焊接接头的强度略高于母体强度。

youdao