FLOW LINE FOR THERMAL PROCESSING OF WELDED CONNECTION ZONE OF DRILL PIPES Russian patent published in 2007 - IPC C21D9/08 

FIELD: production of pipes, in particular, drill pipes with connection locks welded thereto.

SUBSTANCE: flow line has machines for friction welding of lock connections at one and other ends of pipes, station for collecting of packet and leveling position of welded connection zones before thermal processing, induction heating chamber for induction heating before normalization procedure, induction heating chamber for heating before tempering of welded connection zones at one side of pipes collected into packet, station for leveling position of welded connection zones before thermal processing, similar induction heating chambers for normalization, cooling, induction heating before tempering of welded connection zones at other side of pipes collected into packet, water laminar cooling systems arranged at stations for leveling position of welded connection zones, and sprayers positioned in cooling chambers and adapted for water-air cooling of welded connection zones. All of mentioned parts of flow line are arranged in succession and connected with one another through transportation means. Intensified adjustable cooling sprayers are located within heating chambers for heating before normalization procedure. Welded connection zone cooling sprayer is positioned downstream of first machine for welding of lock connections.

EFFECT: increased efficiency and enhanced reliability in operation.

3 cl, 1 dwg, 1 tbl