活性剂等离子弧焊焊接电弧的特性

针对活性剂等离子弧焊焊接过程，采用红外热像伪着色法测定了活性剂等离子弧焊焊接电弧温度场，并建立了活性剂等离子弧焊焊接电弧热流密度径向分布模型，对焊接电弧外形的变化，焊接电弧电压与活性剂之间的关系进行了研究。研究结果表明：活性剂等离子弧焊焊接电弧的温度分布比较紧凑，温度场外形窄，温度分布范围较集中，电弧径向温度梯度较大。电弧径向温度分布呈现正态Gauss分布模式。活性剂等离子弧焊焊接电弧收缩，弧尾翼消失，尾焰加大，电弧穿透力增强，电弧电压升高。

PROPERTY OF THE ARC IN ACTIVATED FLUX PLASMA ARC WELDING

In activated flux PAW welding, the welding arc temperature field is measured by the infrared sensing and computer image technique. The distribution models of welding arc heat flow density of activated flux PAW welding are developed. The phenomenon of welding arc effecting by activated flux is studied, and the relationships between the welding arc voltage and activated flux is studied. The results show that the welding arc temperature distribution in activated flux PAW welding is compact, the outline of the welding arc temperature field is narrow, the range of the welding arc temperature distribution is concentrated, the welding arc radial temperature gradient is large, the welding arc radial temperature gradient shows normal Gauss distribution, the activated flux PAW welding arc is contractive, the arc tail is disappear, the efflux plasma is increasing, the force of penetration is strengthening, the arc voltage is larger.