GMAW堆焊保护气流场及电弧温度场模拟  

Simulation of Flow Field of Protective Gas and Temperature Field of Arc during GMAW Surfacing

作　　者：毛志伟[1] 姜驰 周少玲[2] 钟庆飞 黄涛 MAO Zhiwei;JIANG Chi;ZHOU Shaoling;ZHONG Qing Fei;HUANG Tao(School of Mechanical and Electrical Engineering,Nanchang University,Nanchang 330031,China;Jiangxi Industry Polytechnic College,Nanchang 330095,China;JMC Holding Company,Nanchang 330001,China)

机构地区：[1]南昌大学机电工程学院,江西南昌330031 [2]江西工业职业技术学院,江西南昌330095 [3]江铃控股有限公司,江西南昌330001

出　　处：《热加工工艺》2018年第15期157-160,164,共5页Hot Working Technology

基　　金：国家自然科学基金资助项目(515265036)

摘　　要：为获得CO2作为保护气时GMAW堆焊过程中的保护气流场及电弧温度场,在电弧模型假设基础上,建立了GMAW电弧三维数学模型,并确定了电弧计算区域和边界条件。采用ANSYS CFX软件,对焊接电流200 A、焊丝直径1.2 mm、CO2流速15 L/min的GMAW平板堆焊焊接过程进行模拟,获得了焊接过程中保护气的流场及电弧的温度场。结果表明,工作状态时保护气向焊丝轴向聚集,气体流速急剧上升,产生强烈的湍流扩散;熔滴使电弧温度降低,保护气的湍流扩散效果减弱,保护区域增大,能满足焊接需求。该分析结果为研究喷嘴结构和焊接工艺优化提供理论依据。In order to obtain the protective gas flow field and arc temperature field during the GMAW surfacing process with CO2 as the protective gas, the three-dimensional mathematical model of GMAW arc was established based on the assumption of arc model, and the arc calculation region and boundary conditions were determined. The GMAW flat welding process under the welding current of 200 A, wire diameter of 1.2 mm and CO2 flow rate of 15 L/min was simulated by using ANSYS CFX software, and the protective gas flow field and arc temperature field during the welding process were obtained.The results show that in working state the protective gas gathers toward wire and the gas flow velocity increases rapidly,which genarates strong turbulence diffusion. The droplet reduces the arc temperature, the effect of turbulent diffusion of protective gas is weakened and the protected area increases, which can meet the welding demands. The results provide theoretical basis for the study of nozzle structure and welding process optimization.

关 键 词：熔化极气体保护焊 堆焊 电弧模型 气流场 电弧温度场 

分 类 号：TG402[金属学及工艺—焊接] TG403