摘要
以TIG焊熔池为研究对象,建立不锈钢薄板三维移动TIG焊熔池的数学模型.模型中考虑浮力、电磁力、表面张力、边界条件和热物性参数.利用Fluent软件,求解控制方程组,得到不锈钢薄板TIG焊接过程运动的熔池形状、温度场和流场.并用激光器发射激光点阵到电弧下方工件,由熔池表面镜面反射于成像屏上,高速摄像获得反射的激光点阵,通过数据恢复处理得到熔池边缘信息,用模拟结果进行对比分析.结果表明,所建立的三维运动熔池的模型是准确的,模拟所获得的1 820K等温线与试验获得的熔池边缘吻合良好,模拟熔池截面与熔透焊缝截面形态也有着较好的吻合.
Taking TIG welding pool as investigation object,a mathematical model was set up for mobile three-dimensional TIG welding pool of stainless steel sheet welding.In this model,the parameters such as buoyancy,electromagnetic force,surface tension,boundary condition,and thermophysical properties were taken into account.The software FLUENT was employed to solve the governing equation set,so that the shape of the mobile weld pool and its temperature field and flow field in the TIG welding process of the stainless steel sheets were obtained.And a laser was used to illuminate the work-piece under the welding arc and its light was reflected by the weld pool surface onto the imagery screen,forming a laser lattice which was taken by a high-speed camera.After data recovery processing,the message of the weld pool edge was obtained,compared with the simulation result,and analyzed.The result showed that the model of three-dimensional mobile weld pool presented was accurate,the 1 820 K isotherm obtained with simulation was consistent with the tested one,and the simulated pool cross-section was also well consistent with the cross-section of penetrative weld.
出处
《兰州理工大学学报》
CAS
北大核心
2013年第6期19-23,189,共5页
Journal of Lanzhou University of Technology
基金
国家自然科学基金(51205179)
甘肃省自然科学基金(1010RJZA044)
关键词
不锈钢薄板焊接
三维熔池
数值模拟
stainless steel sheet welding
three-dimensional weld pool
numerical simulation
