METHOD OF AND DEVICE FOR CONSUMABLE ELECTRODE ELECTRIC ARC WELDING Russian patent published in 1998 - IPC

FIELD: mechanical engineering; welding. SUBSTANCE: flat insulated electrode with lead is fixed in joint between pipes to be welded. Electrode is made in form of part of ring with mean radius equal to mean radius of pipes to be welded. Width of electrode is equal to thickness of pipe walls. Electrode is shunted through easily melting jumpers by highly conducting bus. Electric arc is started between electrode and pipes to be welded. Power source is adjusted to required current and voltage according to desired power. Core and end face surfaces of pipes are melted. Power output is found by formula depending on required value of metal vapor gauge pressure. Electric arc is displaced automatically along end face of core. Weld metal melt is cooled. Sections of butt joint remaining unwelded are welded by stick electrode. Welding device has flat consumable insulated electrode with lead. Easily melting jumper connect electrode and shunting bus with lead. Electrode and bus are made in form of part of ring with central angle of ϕ < 360^°/N where N is number of electrodes placed on one butt joint of pipes. Values of electrical resistance of shunting bus R_b,, jumper R_j and electrode R_e are related by expression (R_b+R_j) < R_e/n^, where n is number of jumpers per electrode. EFFECT: simplified process of pipe welding, enhanced quality of welds. 3 cl, 3 dwg