Influence of joint topology on the formation of brazedjoints

Abstract

This paper discusses the influence of joint topology on the formation ofbrazed joints. For the purposes of this study, the joint topology is definedby dimensionless parameters that characterize: (i) the geometry of the matingsurfaces (shape and configuration), (ii) the gap between bonded parts(clearance and tolerances), (iii) the joint orientation in the gravityfield and (iv) the volume of the joint. The influence of these parameters is presented for several joints witha topology that is typically found in the manufacture of compact heatexchangers. The results were obtained by employing a method that is based on avariational principle and minimization of the potential energy of the moltenaluminium liquid metal just prior to the onset of solidification. The method,which was verified by comparison with experimental data obtained fromcontrolled atmosphere brazing of aluminium alloys, is discussed in anaccompanying paper.