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

采用数学规划方法建立了瞬时液相焊工艺专家系统。TLP连接专家系统由三个支持系统组成，每个支持系统包含若干模块。实验计划的支持系统是基于母材信息的粘接先例检索系统，由数据库模块和实验要点建议模块组成。镶块合金设计支持系统是适合母材的镶块合金成分优化系统，包括神经网络配方模块、遗传算法极值搜索模块、满意折衷法优化模块和试验点建议模块。工艺参数优化支持系统是工艺参数选择系统和安全裕度评价系统，它涉及到与镶块合金设计支持系统类似的模块。将该专家系统应用于碳钢S45C的TLP连接，得到了最佳的镶块成分为Ni-4.5%Cr-3.3%Si-4.5%B，同时满足抗拉强度和冲击吸收能的最佳连接条件为1425K，7.2ks。对最佳粘接条件的安全裕度进行了评价。工艺参数的安全裕度为键合温度约20K，键合时间约600s。

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.