PROCEDURE FOR AUTOMATIC ELECTRIC-ARC HIDDEN PAD-WELD OF EXTERNAL OR INTERNAL SURFACES OF ROTARY BODIES Russian patent published in 2011 - IPC B23K9/04 B23K9/18 

FIELD: machine building.

SUBSTANCE: electrodes of one or several groups are arranged with set-off in horizontal plane counter direction of rotation of a body with linear deviation from "zenith" at 5-20 mm and angular deviation from "zenith" over 30°. Distance between electrodes of each group is chosen from condition of forming common bath of liquid metal along whole width of weld pad. There is formed a circular pad of area equal to area of treated surface at rotation of the body and at simultaneous transfer of electrodes in direct and reverse directions along its generatrix; transfer is matched with feed of melt. There is formed the bath of liquid metal and slag stretched along the rotary body; ratio of its geometrical sizes is not less, than 3:1. Pad weld is performed at rate of lengthwise travel of electrodes, 28-32 times exceeding linear speed of body rotation.

EFFECT: pad weld of considerable amount of metal on surface of rotary bodies of diametre less, than 150 mm when area of pad weld is commeasurable with dimensions of parts; ensuring high quality of produced coating and high efficiency.

2 cl, 2 dwg, 1 tbl