ARC WELDING METHOD Russian patent published in 2014 - IPC B23K9/25 B23K28/02 B23K33/00 

FIELD: machine building.

SUBSTANCE: welding method consists in two-sided simultaneous fusion of opposite sides of a joint. The parts being welded are installed in a horizontal plane. Grooving with bevels and noses of 8-12 mm is carried out. One welding electrode is installed at each side of the joint, the said electrodes are shifted in respect to each other in longitudinal direction. The distance between the electrodes is chosen as equal to 1.0-1.5 of the weld pool length of the front arc. Powers of the welding arcs are regulated separately at each electrode. The travel speeds of the welding electrodes and the arcs are equal. Welding in overhead position is carried out on the side of the edge nose by means of a non-consumable electrode which is set ahead in respect to the direction of the welding path. The speed and power of a welding arc are chosen so that to provide for 25-35% penetration from the nose of the bevelled welded edges. Flat-position welding is carried out on the side of the edge nose by a consumable electrode. The power of a welding arc at flat-position welding is chosen so that to provide for 85-75% penetration from the nose. The diameter of the consumable electrode is chosen so that to provide for maximal filling of grooving cross section.

EFFECT: reduction of expenditures on additional material at welding and improvement of welding efficiency.

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