基于光谱诊断的氩氮TIG焊电弧物理特性分析

Analysis of arc physical property in argon-nitrogen TIG welding based on spectral diagnosis

关键词:  氩氮混合气体钨极惰性气体保护焊  光谱测量  标准温度法

Key words:  argon-nitrogen mixed gas tungsten inert gas shield welding  spectral measurement  standard temperature method

摘要:

混合气体保护焊能够提高焊接质量及生产效率，由于混合气体保护焊电弧成分复杂多变，对其物理性能等的研究具有一定的难度. 文中以氩氮混合气体钨极惰性气体保护焊（TIG焊）电弧为研究对象，采用双电荷耦合元件（CCD）电弧光谱图像采集试验系统，获取氩氮混合气体TIG焊电弧Ar I及N I的特征谱图像的动态分布；结合双元素双组分标准温度法对不同浓度（50%Ar + 50%N₂，80%Ar + 20%N₂及100%Ar）的氩氮电弧进行光谱诊断. 结果表明，电弧半径最高收缩50%左右，温度最高升高12%. 通过对氩氮电弧物理性能的定量分析为研究混合气体保护焊焊缝成形的本质奠定了理论基础.

Abstract:

Hybrid shielding gas was often used in arc welding to improve its quality and speed. The research of its physical property is difficult, since the composition in hybrid shielding gas welding is complicated and variable. Arc plasma in argon-nitrogen tungsten inert gas (TIG) welding was chose as the research object, the double charge coupled device (CCD) experimental system was setup to obtain spectrum image of Ar I and N I, Fowler-Milne method was used to calculated the temperature and mole fraction distribution in 50%Ar + 50%N₂,80%Ar + 20%N₂ and 100%Ar arc plasma. The results showed that the radius shrinkage can reach 50%, and the temperature raise ccan reach 12% in 50%Ar + 50%N₂ arc plasma. It provides the theory basis for the research of weld seam forming essence through the analysis of the physical property of argon-nitrogen arc plasma.