METHOD OF WELDING LONGITUDINAL PIPES WELDS Russian patent published in 2017 - IPC B23K31/02 B23K33/00 B23K26/348 B23K26/26 

FIELD: technological processes.

SUBSTANCE: after joining the edges of pipe billet, the tack weld is made by arc welding. Main working weld is applied with the melting of the tack weld by laser or laser-arc welding. Then, inner and outer facing welds are performed by arc welding. Before the main working weld is made, the pipe billet is lifted to a fixed position by means of a drive mechanism connected to the control unit, on the input value of which the value of the angle of pipe billet inclination is entered. By means of driving support rollers, arranged to position and rotate the pipe billet by 360°, the joint of the edges of pipe billet is set to the position for 12 hours. Main working seam is made on the rise. Then pipe billets are lowered and either external face weld on the descent, without changing the position of joints of the edges of pipe billet, or inner face weld on the downhill is made, tentatively setting the joints of edges of pipe billet at 6 o'clock position.

EFFECT: increase of reliability of welded seam.

2 dwg