Supporting System for Insert Metal Design used for Transient Liquid Phase Bonding

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The Expert system for transient liquid phase (TLP) bonding process has been established using a mathematical programming method. The expert system for TLP-bonding consisted of three supporting systems which involved several modules for each. The supporting system for planning of experiment was the searching system of the bonded precedents based on the base metal information which consisted of database module and suggesting points of experiment module. The supporting system of alloy design of insert metal is the optimizing system of insert metal composition suitable for base metal which involved formulation module by neural network, search for extremal value module by genetic algorithm, optimization module by satisficing trade-off method and suggesting points of experiment module. The supporting system for optimization of processing parameter is the selection system of processing parameters and evaluation system of safety margin which involved similar modules as the supporting system of alloy design of insert metal. The present expert system has been applied to TLP-bonding of carbon steel, S45C.The insert metal composition was optimized as Ni-4.5%Cr-3.3%Si-4.5%B.The optimum bonding condition where both tensile strength and impact absorbed energy were satisfied compromisingly was selected as 1425K for 7.2ks. The safety margins around the optimum bonding condition have been evaluated. The safety margin of processing parameters were about 20K for bonding temperature and about 600s for bonding time.