Alloying behavior at welding interface in dissimilar metal joint fabricated by friction stir process

采用搅拌摩擦点焊对纯铝板与低碳钢板进行搭接。在所有的停留时间内都实现了焊接。沿焊接界面形成金属间化合物层。精确的背散射电子像观测和能量色散x射线能谱分析表明，金属间化合物层由Al_<13>Fe_4相层和Al_5Fe_2相层组成。层的厚度与停留时间的平方根成比例地增加。

Lap joining of a pure aluminum plate and a low carbon steel plate was performed using friction stir spot welding. Welding was achieved for all dwell times. Intermetallic compound layer was produced along the welding interface. Precise backscattered electron image observation and energy dispersive X-ray spectroscopy analysis revealed that the intermetallic compound layer consisted of an Al_<13>Fe_4 phase layer and an Al_5Fe_2 phase layer. The thickness of the layers increased in proportion to the square root of the dwell time.