APPARATUS FOR AUTOMATICALLY CONTROLLING POSITION OF WELDING HEAD Russian patent published in 2003 - IPC

FIELD: automatization of welding processes, namely automatization of electric arc welding of dressed and angular seams by gas shield welding and under flux. SUBSTANCE: second, third, forth and fifth band filters are tuned for separation of second, third, fourth and fifth harmonic components of electric current. Outlet of welding current pickup is connected with inlets of first, second, third, fourth and fifth band filters. Their outlets through first, second, third, fourth and fifth rectifiers are connected with inlets of first, second, third, fourth and fifth smoothing filters. Outlets of first, third and fifth smoothing filters are connected with inlets of first adder. Outlet of first adder is connected with first inlet of analog switch and through inverter with second inlet of analog switch. Control inlet of analog switch is connected with outlet of low-frequency filter. Outlet of analog switch is connected with inlet of amplifier with variable gain. Outlets of second and fourth smoothing filters are connected with inlets of second adder whose outlet is connected with control inlet of variable gain amplifier. Outlet of said amplifier is connected with drive unit for moving head across butt. EFFECT: enhanced quality of welded joint at welding with electrode oscillations. 1 dwg