Liquid Phase Separation of Cu-Fe Weld Metal of Manual SHS Welding
In order to solve a problem of the low mechanical properties of Manual SHS Welding joint, a new iron-base manual SHS welding material was developed by CuO+Al and Fe2O3+Al being the thermit and adding iron alloy materials. The structure and properties of the welded joint were studied. The results indicated that: 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. The higher Fe supersaturation is in the Cu-Fe weld metal, the more notablely and quickly liquid phase separates. At the same time, tensile strength of the welded joint was close to 520 MPa, and impact toughness was close to 32.1J/cm2, and surface hardness was also close to HB360. It also indicated this technology can meet the need of repair of metal parts in field.
Yungang Li, Pengcheng Wang, Liqun Ai, Xiaoming Sang and Jinglong Bu
W. T. Xin et al., "Liquid Phase Separation of Cu-Fe Weld Metal of Manual SHS Welding", Advanced Materials Research, Vols. 291-294, pp. 945-948, 2011