Rapidly tiny resistance welding of Fe₇₈Si₉B₁₃ amorphous foils

Rapidly tiny resistance welding of Fe₇₈Si₉B₁₃ amorphous foils with the thickness of 30 μm was conducted by using 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 Fe₇₈Si₉B₁₃,and effectively prevents the crystallization of weld region. The study in this paper has high practical value in engineering.