【摘要】 通过对变极性TIG焊接电弧稳定性试验研究,发现小电流电弧极性切换时容易引起熄弧。同时,电弧等效电阻的变化导致严重的换向冲击。原因是:电路的等效电容、电感引起小电流换向速度慢,电弧等效电阻变小引起换向冲击。通过二次主电路加耦合电感,以及在电弧极性切换时,采用变参数PI控制与超前控制的软件控制策略,有效解决了变极性TIG焊接电弧的稳定性问题。更多还原

【Abstract】 Welding arc stability of variable polarity TIG welding was studied through experiment.The experimental results indicate that the small current cause the arc extinguisher when the welding arc commutating.Simultaneity,the diversification of the equivalent resistance,which can cause concussion.The equivalent capacitance and the equivalent inductance of the circuit which slower the speed of the current when the arc polarity change.In order to resolve the problem,added the coupling inductance in the main circuit and a control strategy incorporate variable parameter PI into advance control.Experimental results prove the welding arc stability of the variable polarity TIG is available.更多还原