Abstract: Under the drive of energy saving and emission reduction, increasingly importance has been placed on high-strength aluminum alloy to partly replace steel to meet the light-weighting requirement of automobile. However, the reliability of aluminum/steel joint is always an unnegligible issue due to the significant difference of their physicochemical properties. And the formation of brittle intermetallic compounds gives a degradation of mechanical performance. As a non-melt welding process with a lower heat input, brazing is seen as an excellent method to provide reliable joint between aluminum and steel, which has attracted much attention in the past decades. So far, researches on brazing of aluminum and steel has been concentrated in brazing filler metals modification and process optimization. With respect to brazing filler metals, enhancing flux to remove oxide film of aluminum and steel simultaneously during brazing process seems to be a critical topic for the design of Nocolok flux and it has been proved that the properties of aluminum/steel joint could be improved by micro-alloying in Al-Si and Zn-Al systems filler metal, such as Cu, Ag and rare earth elements. In terms of the brazing process, brazing temperature and holding time play an important role in the quality of braze joints. Besides, the coating on surface of steel acts as a diffusion barrier to Fe and Al elements, which impedes the formation of brittle intermetallic compound. In this paper, the present research status of brazing joint of aluminum-steel is reviewed systematically. First of all, the characteristics and application of several common brazing methods for aluminum-steel is introduced. Then the investigations on the effect of doping brazing materials and optimizing brazing process on the properties of aluminum-steel joints are reviewed and the strengthening mechanism is analyzed. Moreover, limitations and solutions of brazing for aluminum-steel are summarized and the development trends are prospected, which provide the beneficial reference for the development of joining technology of aluminum-steel in automobile industry.
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