Comparing with the coarse dendrite microstucture of base metal, the eutectic Si particles are homogeneously dispersed in nugget zone without visual defects.

• 与母材相比，焊核区的硬度分布较均匀，变化幅度小，拉伸试验大都断裂在接头热影响区处，接头的抗拉强度可达母材的70%25左右，表现出了较好的机械性能。