METHOD OF AUTOMATIC-ARC WELDING BY NONCONSUMABLE ELECTRODE OF STRIPS AND TUBULAR BILLETS IN CONTINUOUS AGGREGATES Russian patent published in 2010 - IPC B23K9/16 B23K101/06 

FIELD: metallurgy.

SUBSTANCE: invention can be used for manufacturing of tubular billet in metallurgical lines, for instance pipe-welding machines, in conditions of time restriction for welding of put into aggregates rolls. Installed without clearance of strip it is connected by transverse end joint by automatic-arc welding by nonconsumable electrode. Count of path of welding torch is started on the basis of sensor from edge of strips up to beginning of welded joint. At a distance, equal to half of diametre of molten pool, it is connected arc. After welded joint implementation at the same distance from the edge of strip burner is stopped and arc is disconnected. After connection strip is fed into pipe mill stand for formation of tubular billet and it is implemented longitudinal butt weld with heating of edges of tubular blank and yield of heated edges. Additionally it is implemented remelting and monolithing of edges of transverse butt joint.

EFFECT: receiving of defect-free weld of strips in continuous pipe-welding machines at minimum consumption of time for preparation of joints for welding with receiving of defect-free pipe at the section of convergence of transverse and longitudinal welded joints.

2 cl, 1 dwg