工艺参数对空心阴极真空电弧电子温度影响

Effect of processing parameters on electron temperature of vacuum arc with hollow cathode

为了研究空心阴极真空电弧等离子体特性,通过光谱仪获得了空心阴极真空电弧的发射光谱分布,同时利用相对强度法计算了电子激发温度.结果表明,空心阴极真空电弧等离子体主要由氩离子、氩原子构成;随着放电气压的降低和焊接电流的增加,空心阴极真空电弧的离子浓度逐渐增加;在一定气体流量下,空心阴极真空电弧的电子激发温度随着焊接电流的增加而升高;在低气体流量、大焊接电流时,电子激发温度较高;随着放电气压的升高,空心阴极真空电弧的电子激发温度逐渐降低.当焊接电流较大和气体流量较低时,空心阴极真空电弧的轴线附近的氩离子谱线强度较高,并且其径向分布梯度较大.

The spectral distribution of hollow cathode vacuum arc was acquired using spectrometer with different processing parameters,and the electronic excitation temperature of the arc plasma was calculated by the method of relative intensity.The results show that the hollow cathode vacuum arc plasma was composed of argon ions and argon atoms.The ion concentration in hollow cathode vacuum arc gradually increased with reducing the discharge pressure and increasing the welding current.At a certain gas flow,the electron excitation temperature in the hollow cathode vacuum arc gradually increased as the welding current increased.It is also found that the electron excited temperature was higher at lower gas flow and large welding current.If the discharge pressure became larger,the vacuum arc hollow cathode electron excitation temperature might decrease.With larger welding current and relatively lower gas flow rate,the argon ion spectrum intensity was high around the center axis of the hollow cathode arc.This was beneficial for welding with larger penetration.