METHOD FOR RAILS WELDING Russian patent published in 2022 - IPC B23K28/02 B23K11/04 B23K20/12 

FIELD: welding.

SUBSTANCE: invention can be used in the manufacture by welding of long rails and jointless lashes for railway, urban and industrial transport. The rails, one of which is installed with the possibility of longitudinal movement, are fixed with a gap between the ends to be welded to accommodate a rotating disk tool. First, this tool performs mechanical cleaning of the ends, as well as their preheating by friction. After completion of the friction heating, the disk tool is removed from the gap and the end surfaces of the rails facing each other are closed to perform flash welding. At the preheating stage, the rail feed speed is increased. At the second stage, heating and melting of the ends of the rails are carried out at a constant feed rate. At the third stage, the final heating is carried out before upsetting, which consists of two heating sections, the first of which is carried out at a variable feed rate of the rails, and the second - at a constant feed rate. Resistance welding by continuous or pulsed flashing is provided.

EFFECT: invention provides an extension of the technological capabilities of the rail welding method, while increasing energy efficiency and the quality of the weld.

4 cl, 2 dwg