化工学报2016，Vol.67Issue(z1)：69-75,7.DOI:10.11949/j.issn.0438-1157.20160614
等离子弧移动焊接的热-力耦合穿孔过程
Thermal and mechanical coupled keyholing process in moving plasma arc welding
摘要
Abstract
Due to the strong heating effect and arc force,plasma arc welding (PAW) can instantly melt metal material and then penetrate through the molten metal,forming a vapor-filled cavity called as "keyhole".The arc temperature is extremely high in keyhole,and thus a large percentage of heat is able to be transferred to the bottom metal through the keyhole.With respect to the moving PAW,a keyholetracking heat source was developed to reflect the nonuniform heat transfer due to welding movement.It consists of a double-elliptical heat flux on top surface and a lower developing conical heat source proportional to the keyhole growth.The volume of fluid (VOF) method was applied to track keyhole interface,and the heat source was auto-controlled according to keyhole depth.By numerical simulation,heat transfer during the keyholing process was revealed and corresponding temperature field was calculated to display the thermal-physical mechanism in moving PAW.Moreover,keyhole evolution and molten metal flow in weld pool were also investigated to exhibit how the keyhole promotes deep penetration welding.Finally,experiment was carried out on stainless steel plate of thickness 8 mm,and the measured weld geometry and size coincide with simulation results.关键词
等离子弧移动焊接/传热/小孔/气液两相流/流体体积函数/数值模拟Key words
moving plasma arc welding/heat transfer/keyhole/gas-liquid flow/volume of fluid/numerical simulation分类
能源科技引用本文复制引用
李岩,冯妍卉,张欣欣,武传松..等离子弧移动焊接的热-力耦合穿孔过程[J].化工学报,2016,67(z1):69-75,7.基金项目
中国石油大学(北京)科研启动基金项目(2462015YJRC013) （北京）
国家自然科学基金项目(50936003).supported by the Science Foundation of China Petroleum,Beijing (2462015YJRC013) and the National Natural Science Foundation of China (50936003). （50936003）
