Influence of joint topology on the formation of brazed joints

This paper discusses the influence of joint topology on the formation of br azed joints. For the purposes of this study, the joint topology is defined by dimensionless parameters that characterize: (i) the geometry of the mati ng surfaces (shape and configuration), (ii) the gap between bonded parts (c learance and tolerances), (iii) the joint orientation in the gravity field and (iv) the volume of the joint. The influence of these parameters is pres ented for several joints with a topology that is typically found in the man ufacture of compact heat exchangers. The results were obtained by employing a method that is based on a variational principle and minimization of the potential energy of the molten aluminium liquid metal just prior to the ons et of solidification. The method, which was verified by comparison with exp erimental data obtained from controlled atmosphere brazing of aluminium all oys, is discussed in an accompanying paper.