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变间隙MAG焊熔透状态的粗糙-模糊控制方法

A rough-fuzzy control method for the penetration state of variable gap MAG welding
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摘要 正面熔池与熔透状态之间存在一定的对应关系.然而与熔透状态潜在相关的熔池特征众多,如何去除冗余特征,建立一个反映熔池特征与熔透状态对应关系的简洁的知识模型,对实现焊接熔透在线控制具有重要意义.提出一种焊接熔透状态的粗糙-模糊控制方法,并在变间隙MAG焊接实验中进行验证.给出2种基于变精度粗糙集的属性约简算法,以求解表征熔透状态的熔池最小特征集.通过变间隙-电流焊接试验建立熔透状态决策信息系统,引入2个用以描述熔池尾部尖削程度的形状参数,基于粗糙集知识约简和规则提取算法获取熔透状态分类规则.构建熔池尾宽系数的模糊控制模型,利用最小化模糊熵来构造误差论域上的隶属函数.通过2组变间隙焊接实验对该控制模型进行验证,结果表明,闭环控制下焊缝背面熔宽均匀一致,符合焊接规范要求. There is a certain correspondence between the frontal molten pool and the penetration state.However,due to the numerous potential weld pool features related to the penetration state,how to remove redundant features and establish a concise knowledge model that reflects the corresponding relationship between weld pool features and penetration state is of great significance for achieving online control of welding penetration.A rough-fuzzy control method for welding penetration state is proposed and verified in variable gap MAG welding experiments.To solve the minimal feature set of the melt pool that characterizes the penetration state,we provide two attribute reduction algorithms based on variable precision rough sets.A decision information system for penetration state is established through variable gap-current welding experiments,and two shape parameters are introduced to describe the degree of sharpness at the tail of the molten pool.The classification rules of penetration status are obtained using rough set knowledge reduction and rule extraction algorithms.We establish a fuzzy control model for the width coefficient of the molten pool tail,and use the minimization of fuzzy entropy to construct membership functions of the error domain.The proposed control model is validated through two sets of variable gap welding experiments,and the results show that under closed-loop control,the weld back width is uniform and consistent,which can meet the requirements of welding specifications.Highlights:(1)A rough-fuzzy control method of welding penetration state is proposed,and two attribute reduction algorithms based on variable precision rough set are given to solve the minimum feature set of weld pool representing penetration state.(2)The decision-making information system of penetration state is established through variable gap-current welding experiment,and two shape parameters are introduced to describe the sharpening degree of the weld pool tail.Based on rough set knowledge reduction and rule extraction algorithm,the classification rules of penetration state are obtained,the fuzzy control model of weld pool tail width coefficient is constructed,and the membership function on the error universe is constructed by minimizing fuzzy entropy.(3)The control model is verified by two groups of variable gap welding experiments.The results show that the weld width on the back is uniform and consistent under closed-loop control,which meets the requirements of welding specifications.
作者 冯志强 袁浩 刘鹏 向晓宏 曾宪平 黎欣 黎泉 FENG Zhiqiang;YUAN Hao;LIU Peng;Xiang Xiaohong;Zeng Xianping;LI Xin;LI Quan(Beibu Gulf University,Qinzhou 535011,China;Shanghai Shipbuilding Technology Research Institute,Shanghai 200032,China)
出处 《焊接学报》 EI CAS CSCD 北大核心 2023年第11期22-35,I0004,I0005,共16页 Transactions of The China Welding Institution
基金 国家自然科学基金项目(51969001,52261044)。
关键词 熔透状态 熔池特征 粗糙集 模糊控制 坡口间隙 MAG焊 penetration status features of molten pool rough set fuzzy control groove gap MAG welding
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