为研究钨极稀有气体(TIG)电弧的辐射属性,计算了氩等离子体在5000~25000 K温度范围内的净辐射系数,建立了一种二维、稳态的电弧-钨极-水冷铜模型,获得了电弧辐射强度分布、电弧全谱及非真空紫外光谱的辐射功率。引入了辐射强度与欧姆热和辐射强度之和的比值系数,通过分析该系数在电弧中的分布状况,发现辐射在电弧主体区域对热量的散失起决定作用,而传输热在能量平衡中的作用随电弧位置变化。

As for the investigation of the radiative properties for tungsten inert gas (TIG) welding arcs, the net emission coefficients are calculated for argon plasma in the temperature range of 5000-25000 K. A two-dimensional steady TIG arc-tungsten electrode -water-cooled cooper model is established to obtain the arc radiation intensity distribution, the full arc spectrum, and the radiation power of non-vacuum ultraviolet spectrum. A parameter defined as the ratio of radiation intensity to the sum of radiation intensity and ohmic heat is introduced and through the analysis of the distribution of this coefficient in arcs, it is found that the radiation plays a predominant role in the heat loss from arc body area, while the role of heat transport in the energy balance varies with the arc position.