Elimination of high frequency interference during the laser-arc hybrid welding;

Anaysis of high frequency interference in arc welding inverter and control measures;

This paper enters into some technical problems about anti disturbance wire arrangement in computer controlled AC automatic TIG welding system in high frequency interference environment.

The paper investigates the factors affecting high-frequency interference,of which include the high-frequency interference,the length of welding cable and power line,the output resistance of signal source,the type,length and orientation of signal line,the shielding and grounding of high-frequency oscillator,power line and signal line.

In view of the poor high-frequency interference rejection of the original second-order lead correction control strategy,an improved strategy is proposed,which reduces amplitude gain at high frequency without changing phase-frequency characteristic and smooth the phase-frequency characteristic in a broader rage.

From the viewpoint of vibration mode,the fact is explained that high frequency disturbing signals at different points are weakened and changed when the load impulse changes.