等离子焊枪气体保护效果数值模拟  

Numerical simulation of protective effect of plasma welding torch

作　　者：张瑞华[1] 李明[1] 栗海霞[1] 王荣[2] 冷小冰[3] 

机构地区：[1]兰州理工大学 甘肃省有色金属新材料省部共建国家重点实验室,甘肃兰州730050 [2]苏州工业园区华焊科技有限公司,江苏苏州215021 [3]中山职业技术学院,广东中山528404

出　　处：《电焊机》2012年第4期8-12,共5页Electric Welding Machine

基　　金：广东省教育部产学研资助项目(2009B090300250);兰州理工大学博士基金资助项目

摘　　要：针对三种不同结构等离子焊枪,用数值模拟方法解释保护气体流动造成焊接过程不稳定的原因,为等离子焊接工艺确定和焊枪的设计提供了理论依据。在PHOENICS软件中建立等离子焊接保护气体流动的三维数学模型,在未考虑焊接温度场对保护气体流动影响的基础上,模拟气体流量、喷嘴与工件的距离、保护气罩的位置、喷嘴结构等参数对流场的影响,得到了速度场的分布。Aiming to three plasma welding torch with different structure,the reason of making the welding process unstable is explained by the method of numerical simulation.And the result provided theoretical basis for the determination of welding parameters and the design of welding torch.Three-dimensional mathematical model of the flow of shielding gas was established with PHOENICS software. The influence of the value of gas simulation,distance between the torch and workpiece, location of shielded deflector and structure of the nozzle on the flow field was simulated and got the distribution of velocity field without considering the influence of the temperature field. The character of three torches was analysed.

关 键 词：等离子枪 保护气体 流场 数值模拟 

分 类 号：TG431[金属学及工艺—焊接]