工艺参数对耦合AA-TIG焊电弧阳极电流密度的影响

Effects of arc parameters on arc anode current density of coupling AA-TIG arc

关键词:  AA-TIG焊  耦合电弧  氧元素  阳极电流密度  探针法

Key words:  AA-TIG welding  coupling arc  oxygen element  anode current density  probe measurement

摘要:

针对耦合电弧AA-TIG焊,采用基于不锈钢阳极的钨探针法研究了主要工艺参数对电弧阳极电流密度分布的影响规律.与常规TIG焊电弧相比,在相同条件下耦合AA-TIG焊电弧的阳极电流密度明显降低,并随着电弧电流和辅助电弧中氧气流量的减小以及钨极间距和弧长的增大而减小.当主钨极和辅助钨极的间距较小时,耦合AA-TIG焊电弧的阳极电流密度符合高斯分布;当钨极间距较大时,阳极电流密度向双峰分布过渡,电弧边缘部位符合二次高斯分布,而中心部位偏离二次高斯分布.

Abstract:

Influences of main process parameters on arc anode current density distribution of coupling arc AA-TIG welding were analyzed,using the tungsten probe measurement based on stainless steel anode. Compared with normal TIG arc,the anode current density of coupling AA-TIG arc is obviously lower in the same condition. It is decreased with the increase of arc current and oxygen flowrate in the assisted arc,the decrease of tungsten electrode spacing and arc length. When the spacing between the main electrode and assisted electrode is small,the distribution of arc anode current density fits a Gaussian profile. When the electrode spacing is large,it gradually turns to a bimodal distribution. The anode current density at the arc edge is consistent with a quadratic Gaussian distribution,while that at the middle region between the main arc and assisted arc deviates from the quadratic Gaussian distribution.