大电流钨极氩—氦混合气体电弧行为分析  

Behavior of arc in Ar-He Gases tungsten arc welding with high Current

作　　者：李明利[1] 刘占民[1] 

机构地区：[1]北京石油化工学院,北京102617

出　　处：《焊接学报》2005年第8期39-42,共4页Transactions of The China Welding Institution

基　　金：国家863高技术研究发展计划资助项目(2003AA305970)

摘　　要：采用水冷紫铜阳极和水冷TIG焊枪,在60～400A的直流电流范围内,对钨极氩-氦混合气体电弧的行为进行了测定和分析,主要测定和讨论了氩、氦及其不同配比的混合气体电弧的静特性、电弧形态、阴极热功率、阳极热功率等内容.结果表明,随着氦气体积流量分数的增大,特别是当其大于80%以上时,电弧电压明显增大,阳极热功率所占比例明显增大,而阴极热功率所占比例却明显减少.试验中使用TIG焊接方法,通过增大氦气体积流量分数和焊接电流,可完全实现常温下中、厚紫铜试件的熔化,获得足够的熔深和良好的熔深形状,进而可实现不预热焊接.Measurement and analysis have been made for Ar-He gases tungsten welding arc equipped with copper anode and TIG welding gun cooled by water at welding current from 80 A to 400 A. The static characters, arc shape and thermal power of the anode and cathode are measured and discussed for different Ar-He gas ratio. The results show that the arc voltage and the proportion of the thermal power in anode increases obviously while the proportion of thermal power in cathode decreases as the ratio of He increases, especially when the content of He reaches 80% or higher. Medium and thick copper plate can be welded by TIG welding. The ideal weld shape and depth can be achieved by increasing the He ratio in the mixture gas and increasing welding current without preheating the work pieces.

关 键 词：TIG电弧 氩—氦混合气体 电弧行为 热功率 

分 类 号：TG409[金属学及工艺—焊接]