METHOD OF WELDING WITH USE OF SHORT CIRCUITING AND APPARATUS FOR PERFORMING THE SAME Russian patent published in 2003 - IPC

FIELD: welding, namely processes and apparatuses for welding with use of short circuiting of steel tubes, plates and other articles. SUBSTANCE: method comprises steps of moving wick type electrode along groove of welded plates; melting wick type electrode by applying electric power during cycle including zone of transmission and plasma zone; controlling plasma zone for realizing short circuiting in order to make root bead by through fusion along groove. Wick type electrode, preferably is self-protection electrode and it includes ingredients of alloy in core for forming root bead by through fusion with content, mainly similar to that of welded parts. Method is realized by means of apparatus having selector for controlling polarity of separate cycles in the whole process of welding. Change of polarity after certain pulse train enhances quality of welded joint. EFFECT: improved quality of welded joints due to possibility for making uniform smooth seam. 90 cl, 11 dwg