文档介绍：48 8 2012 8 1018—1024 ACTA METALLURGICA SINICA Aug. 2012 –1024 / MIG –?( , 250061) MIG , ER4043 , 6013–T4 –, . , – Zn–Al Al α Fe 3Al Zn ; Fe–Al — , . Fe–Al , FeAl 2, Fe 2Al 5 Fe 4Al 13. , –, 850 J/cm 229 MPa, , ; , . –, , MIG , , A 0412?1961(2012)08?1018?07 MICROSTRUCTURES AND PROPERTIES OF PULSED MIG ARC BRAZED–FUSION WELDED JOINT OF Al ALLOY AND GALVANIZED STEEL QIN Guoliang, SU Yuhu, WANG Shujun Key Laboratory for Liquid–Solid Structure Evolution and Processing of Materials, Ministry of Education, Shandong University, Jinan 250061 Correspondent: QIN Guoliang, associate professor, Tel: (0531)88395897, E-mail: ******@sdu. Supported by National Natural Science Foundation of China (No. 50905099) and Specialized Research Fund for the Doctoral Program of Higher Education (No. 20090131120027) Manuscript received 2012–02–06, in revised form 2012–05–21 ABSTRACT Because there are great di?erences in physicochemical properties and mechanical properties between Al alloy and steel, their joining with high quality and high e?ciency is one of di?cult problems in study of welding technology. According to their di?erence in melting point, the brazing–fusion welding technology of Al alloy to steel was developedbased on MIG welding. In pulsed MIG arc brazing–fusion welding process, the molten ?ller metal and Al alloy base metal will form the fusion weld