Structure and property of Fe-base manual SHS welding joint

In order to solve a problem of the low mechanical properties of manual SHS(self-propagating high-temperature synthesis) welding joint, a new ironbase manual SHS welding material was developed by adding iron alloy materials and CuO+Al and Fe₂O₃+Al as the thermit, and the structure and properties of the welded joint were studied.The results indicate that the welding is fusion welding, and weld appearance is good.Cu-Fe alloy in the molten pool experiences liquid phase separation during rapid solidification, and the weld metal is macroscopically separated into one Fe-rich part and one Cu-rich part.Fe-rich phase is filled in the welding line.At the same time, tensile strength of the welded joint is up to 520 MPa, impact toughness is 32.1 J/cm², and surface hardness is also close to HB360, which indicates this technology can meet the need of repair of metal parts in field.