氧含量对TIG焊瞬态熔池行为影响的数值分析  

Numerical analysis of effect of oxygen content on transient welding pool behavior of TIG welding

作　　者：樊丁[1,2] 郝珍妮[1] 黄勇[1,2] 黄健康[1,2] 

机构地区：[1]兰州建工大学甘肃省有色金属新材料重点实验室,甘肃兰州730050 [2]兰州理工大学有色金属合金及加工教育部重点实验室,甘肃兰州730050

出　　处：《兰州理工大学学报》2013年第3期18-21,共4页Journal of Lanzhou University of Technology

基　　金：国家自然科学基金(51074084);甘肃省自然科学基金(1010RJZA037)

摘　　要：建立定点高斯热源作用下TIG熔池的三维瞬态数学模型,考虑焊接熔池内各项散热、焊件内部及表面传热、相变潜热、材料热物理性能参数随温度变化等问题,运用FLUENT软件及其UDF的二次开发功能,模拟不同氧含量对熔池温度场及速度场的影响.结果表明:表面张力温度系数发生转变时的临界温度对熔池温度场和速度场有着决定性影响,该临界温度随氧含量的增加而增加,并且随着氧含量增加逐渐向熔池中心靠近.随着临界温度线的转移,表面张力发生改变,熔池内的Marangoni对流也因此改变,进而使得熔池形貌从低氧含量时浅而宽的形状变成为高氧含量时的深且窄的形状.A 3-D transient mathematical model of the stationary TIG weld pool with Gaussian heat source was developed and taking into account various heat dissipation in the weld pool, heat trans/er in the weld- ment, latent heat, and thermo-physical parameter change with temperature, The effect of different oxygen contents on the temperature and velocity fields of weld pool was simulated by using software FLUENT and its secondary development function of UDF. The result showed that the critical temperature would have a decisive influence on the temperature and velocity fields in the pool if the temperature coefficient of the surface tension was changed. This critical temperature would increase with the increase of oxygen content and approach the weld pool center, the surface tension change with the change of the location of the critical temperature, and consequently, the direction of the Marangoni convection change, thus the weld pool would transform from a shallow and wide shape in the case of low oxygen content to a deep and narrow shape in the case of high oxygen content.

关 键 词：TIG熔池 氧含量 表面张力 数值模拟 

分 类 号：TG402[金属学及工艺—焊接]