Interfacial structure and properties of galvanized steel sheet joined by pulsed arc brazing process

The galvanized steel sheet was joined by pulsed arc brazing process, and the joint interfacial structures and properties of the joints at different pulse frequencies were studied, which the arc pulse frequencies are 100 to 2000 Hz.It can be seen that the agitation and brushing action of the molten pool is increaed with the increase of pulse frequencies, then the whisker-like intermetallic compound fragmentation behavior is strengthened and the constitutional supercooling zone is broadened from 40 μm to 120 μm.At last, the dispersal quantity and width of fine Fe₅Si₃(Cu) particles are increased in brazed joint, which strengthens the joint mechanical properties, and the maximum micro-hardness of the interfacial zone is improved from 175 MPa to 204 MPa.