微束等离子弧焊电弧多物理场耦合  

Multi-field coupling of arc in micro-plasma arc welding

作　　者：张济楠 何建萍[1] 王晓霞[1] 林杨胜蓝 

机构地区：[1]上海工程技术大学材料工程学院,上海201620

出　　处：《焊接学报》2018年第6期13-18,共6页Transactions of The China Welding Institution

基　　金：国家自然科学基金资助项目(51275283);上海市科委基础研究重点资助项目(14JC1402700);上海工程技术大学研究生创新项目(16KY0516)

摘　　要：对微束等离子弧焊电弧温度场、流场、电磁场、电弧压力场进行了计算分析.结果表明,轴向和径向温度分别随距钨棒端部和电弧轴中心距离的增加而降低;轴向流速经一段时间后趋于稳定,喷嘴内等离子体径向流速较喷嘴外小,且喷嘴内外流场方向相反;电磁力随距钨棒端面距离的增加而减小,喷嘴内较喷嘴外大,且喷嘴内外电磁力方向也不完全一样;阳极表面上的电弧压力远小于普通等离子弧焊的电弧压力.此外,各物理场之间相互耦合.高速摄影相机拍摄后经处理得到的电弧等灰度线分布与数值模拟轴向等温线分布趋势一致;三维动态光谱检测系统检测计算得到的径向温度分布与数值模拟得到的径向温度分布一致.Temperature field,flow field,electromagnetic force field and arc pressure field distributions of arc in microplasma arc welding were investigated,respectively. The results showed that axial and radial temperature decreased with distance from tungsten rod tip and axial arc center increasing,respectively. The axial velocity changes to stabilize over a period of time.Radial velocity inside nozzle was lower than radial velocity outside nozzle. Direction of velocity inside and outside nozzle was opposite. Electromagnetic force decreased with distance from tungsten tip increasing. Electromagnetic force inside nozzle was bigger than electromagnetic force outside nozzle. Directions of electromagnetic force inside and outside nozzle were different. Arc pressure in micro-plasma arc welding was far lower than in other kind of plasma arc welding. In addition,physical fields were correlated with each other. Numerical calculated radial and axial temperature distributions agreed with distribution results by using spectrum detection and image processing of high-speed photography,respectively.

关 键 词：微束等离子弧焊电弧 数值模拟 多物理场 耦合 检测验证 

分 类 号：TG403[金属学及工艺—焊接]