基于FLUENT的CMT焊接熔池流场的数值分析  

Numerical analysis of weld pool fluid field during CMT welding based on FLUENT software

作　　者：姚庆军[1] 刘书高 胡庆贤[2] 王顺尧[2] 王晓丽[2] 

机构地区：[1]江苏省特种设备安全监督检验研究院扬州分院,225003 [2]江苏科技大学 江苏省先进焊接技术重点实验室,镇江市212003

出　　处：《焊接》2014年第3期22-26,30,共6页Welding & Joining

基　　金：江苏高校优势学科建设工程资助项目;国家自然科学基金51005106

摘　　要：CMT是一种新型的低热输入焊接工艺,在传热学和流体动力学的基础上,结合CMT熔滴过渡在一冷一热不断交替中完成特点,同时考虑了相变潜热、材料热物理性参数随温度变化等问题,建立了CMT焊接熔池三维瞬态数学模型。对熔滴及母材分别施加弓柱状热源与双椭球热源,并利用UDF进行二次开发,成功实现了热量与熔池体积力脉冲施加。用所建模型研究了CMT焊接熔池的演变过程,较好的模拟了不同焊接参数对CMT焊接流场的影响规律以及准稳态时基值电流与峰值电流作用期间熔池流场的分布规律,同时分别分析了浮力、电磁力、重力对熔池流场分布的影响。CMT welding is an innovative welding process with low heat input.A three- dimensional transient model of CMT welding was established to analyze the temperature field and flow field based on heat transfer and fluid dynamics.The characteristics of high frequent alternate 'hot- cold' CMT drop transfer process,combined with those issues like latent heat,variation of thermal physical parameters with temperature were taken into account in this model.The arch column heat source and double ellipsoid heat source were applied on the droplet and the base metal,respectively.The heat and pool volume force were successful implemented by pulse mode with the secondary development of UDF.By the established model,the evolution process of CMT welding pool was analyzed.The influence of welding parameters on the fluid field during CMT welding and the fluid field distribution during base current and peak current were simulated with the established model.At the same time,the effect of the buoyancy,electromagnetic force and gravity on the fluid field distribution were also analyzed respectively.

关 键 词：CMT焊接 流场 脉冲 数值模拟 

分 类 号：TG442[金属学及工艺—焊接]