FIELD: process engineering.
SUBSTANCE: invention relates to electric welding of primarily thin-sheets articles from different-thickness and chemically inhomogeneous pipes. Pipes are aligned. Edges are arc tacked and annular seam is arc welded over pipe end face by short-time current pulses. Tacking and welding are made simultaneously by several fixed heat sources composed of torches or electrodes. Heat sources are spaced apart so that heat contact between live arcs is inhibited. Every heat source is connected separately to its power supply.
EFFECT: better geometry of welded structure and higher quality of weld joint.
1 ex
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