摘要
关于法兰端面防松片焊点疲劳寿命与焊点布置问题,如果根据焊接标准对工件焊点布置方案进行设计,可能会导致工件材料的性能得不到完全发挥,若在一些危险区域的焊点过少,则会导致焊接失败,焊点过多则会导致材料性能的破坏,焊接成本增加。因此,根据防松片焊点疲劳寿命与个数之间的关系,对防松片焊点布置方案进行了优化设计,提高法兰端面防松片焊点疲劳寿命性能。首先,对法兰端面防松片焊点布置方案进行了设计;其次,基于ANSYS建立了防松片焊接有限元模型,通过对焊接过程中热流密度分布的分析,采用高斯热源模型作为防松片焊接模型热源;通过对防松片焊点模型分析求解出了法兰端面防松片不同焊点布置方案的最大应变;最后,建立了焊点疲劳寿命预测模型,根据应变进行疲劳寿命预测并进行求解,求解出不同分布方案下焊点的疲劳寿命,并对数据进行高斯曲线拟合建立优化函数关系,通过拟合优化结果表明当防松片内圈焊点24个、外圈焊点30个同时作用在防松片上时,其焊点疲劳寿命能够得到较好的保持。
With regard to the fatigue life and solder joint arrangement of flanged end-face flanges,if the solder joint arrangement scheme of the workpiece is designed according to the welding standard,the performance of the workpiece material may not be fully developed,if there are too few solder joints in some dangerous areas,it will lead to welding failure,too many solder joints will lead to the destruction of material properties,welding costs increase.Therefore,according to the relationship between the fatigue life and the number of flanged solder joints,the layout of flanged solder joints was optimized to improve the fatigue life of flanged solder joints.Firstly,the layout of flanged end-face anti-looseness solder joint is designed.Secondly,a finite element model of anti-looseness welding was established based on Ansys.Gauss heat source model was used as the heat source of anti-looseness welding model by analyzing the heat flux distribution during the welding process.Based on the analysis of the solder joint model of flanged flanges,the maximum strain of different solder joint arrangement of flanged ends is obtained.Finally,the fatigue life prediction model of solder joint is established,and the fatigue life of solder joint is predicted and solved according to the strain,the data were fitted with Gauss curve to establish an optimization function.The fitting optimization results show that when 24 inner ring solder joints and 30 outer ring solder joints simultaneously act on the anti loosening sheet,the fatigue life of the solder joints can be well maintained.
作者
徐明刚
王振
张从鹏
管生智
刘祖煌
XU Minggang;WANG Zhen;ZHANG Congpeng;GUAN Shengzhi;LIU Zuhuang(School of Mechanical and Materials Engineering,North China University of Technology,Beijing 100144,China)
出处
《电焊机》
2024年第7期93-99,共7页
Electric Welding Machine
关键词
电阻点焊
焊点疲劳寿命
焊点分布优化
高斯曲线拟合
resistance spot welding
fatigue life
optimization of solder joint distribution
gaussian curve fitting
