SACTIG与VPTIG电弧稳定性的比较分析(一)

Study on arc stability of SACTIG and VPTIG(Ⅰ)

采用高速录像系统、焊接电弧分析仪同步实时采集SACTIG(sine alternative cur-rent TIG)与VPTIG(variable polarity TIG)焊接电流、电弧电压、电弧形态信息。比较分析了SACTIG与VPTIG焊在焊接电流过零期间,焊接电弧稳定性与相关参数之间的关系。研究表明,工频正弦交流TIG电弧电流过零期间可能会发生熄弧和再引弧现象。焊接电流增加到一定值时,就可消除熄弧和再引弧现象,使工频正弦交流TIG电弧也具有良好的电弧稳定性。再引弧电压越高,电弧稳定性越差;再引弧电压等于电弧电压,就不会发生熄弧和再引弧现象。

The welding current, arc voltage and shape of SACTIG and VPTIG welding were collected by high-speed camena system and welding arc analyzer. The relation betwenn welding are stabklity and associated parameters during the passing zreo time of SACTIG and VPTIG welding current was analyzed. The studied results indicated that (50Hz) SACTIG arc may go out and reignite during changing polarity. While welding current increase to a threshold the arc will not go out. The higher reignition voltage will caused the longer arc going out, so the arc stability becomes worse. If reignition voltage is equal to arc voltage, the arc will not go out.