微束等离子弧焊电弧温度场的数值模拟  

Numerical simulation of temperature field distribution of micro plasma arc in MPAW

作　　者：张济楠 何建萍[1] 王晓霞[1] 林杨胜蓝 王昂洋 

机构地区：[1]上海工程技术大学材料工程学院,上海201620

出　　处：《焊接技术》2016年第5期34-37,7,共4页Welding Technology

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)

摘　　要：建立了微束等离子弧三维有限元模型,考虑了阴极钨棒以及喷嘴的约束,采用ANSYS软件对微束等离子弧的温度场进行了数值模拟,比较了不同焊接电流以及不同阴极端面形状对电弧温度场的影响,并通过光谱检测计算对电弧端面温度场分布进行了试验验证。研究结果表明,在焊接电流为2 A,离子气体流量0.5 L/min的工艺条件下,微束等离子弧焊时在靠近阴极端部电弧的温度达到了15 000 K,电弧端面温度场的光谱检测计算结果与模拟结果一致;在电流较大以及阴极端面较小的情况下,微束等离子弧的最高温度得到了提高。A three-dimension finite element model of MPAW arc was established, taking constraints of tungsten rod and nozzle into account. In the passage, ANSYS software was used to calculate the temperature field of micro-plasma arc. Different welding currents and different diameters of end surface of tungsten rod were compared, and the calculation was validated by the spectral measurement. The results showed that the temperature of the end section of cathode reached 15 000 K in the condition of welding current was 2 A and plasma gas flow was 0.5 L/min. The temperature field near the nozzle was calculated by standard temperature spectroscopy measurement, which was basically similar to the result of numerical simulation. Under the large current and small diameter, the temperature distribution of micro plasma arc could be improved.

关 键 词：微束等离子弧焊 电弧 数值模拟 温度场 

分 类 号：TG456.2[金属学及工艺—焊接] O242.21[理学—计算数学]