Research and Application of Direct Welding Technology on Super Large Section Conductor

This paper focuses on steel-aluminum welding technology and full-section vertical welding technology for large section works mainly used in aluminum reduction industry. Direct welding between steel and aluminum would form brittle chemical compounds and cracks in the joints. Research in this paper showed that proper transition layer metal as brazing filler metal, with heat input management during the welding process could effectively restrain the compound formation and reduce cracks tendency as well. Factors that influence the compound formation have been found from numerous tests, through which we can get good welding joints with shear strength above 110 MPa. In view of current shortcomings of traditional repair methods about large section works during aluminum reduction process, this paper comes up with a vertical welding technology by which the joints can have the equal property of the base metals. It adapts to large section welding between steel and steel and between aluminum and aluminum Actual practice proves that it already has fulfilled the requirements of wide application