Fe78Si9B13非晶箔快速微细电阻焊接

摘要

使用微型逆变式直流焊机对厚度为30 μm的Fe78Si9B13非晶箔进行快速微细电阻焊接分析,探讨了焊接工艺参数对非晶接头的影响.在焊接时间为2 ms、焊接电压为0.2V、焊接力为56 N时,获得的接头焊接效果良好,无裂纹、缩孔等焊接缺陷.接头平均抗剪强度可达632 MPa,经XRD检测接头仍为非晶态结构,具有实际工程应用价值.通过形核动力学分析,接头冷却速度高达7.9×106K/s,远高于Fe78Si9B13非晶的临界冷却速率,有效防止接头区晶化.%Rapidly tiny resistance welding of Fe78Si9B13 a-morphous foils with the thickness of 30 μm was conducted by u-sing an inversion DC resistance welding machine. The welding parameters which affect the property of amorphous foils were discussed. The high quality joints were got without welding defects and welding parameters are as follow; 2 ms welding time, 0.2 V welding voltage and 56 N welding force. The average shear strength of the joint reaches 632 MPa. XRD test shows that the joint is amorphous structure. The cooling rate in the joint reaches 7.9 ×106 K/s, which is calculated by nucleation kinetics model, and obviously higher than the critical cooling rate of amorphous Fe78 Si9 B13, and effectively prevents the crystallization of weld region. The study in this paper has high practical value in engineering.