METHOD OF FRICTION SEAM WELDING OF PARTS FROM TITANIUM ALLOYS Russian patent published in 2012 - IPC B23K20/12 B23K103/14 

FIELD: process engineering.

SUBSTANCE: invention may be used in jointing vane root and turbomachine disk together by friction, particularly, in production or repair of turbomachine monoblocks from titanium alloys. In heating, work pieces are pressed against each other along contact surface with force making welding pressure at preset amplitude and frequency of relative displacement of parts along said contact surface. Forging is performed after workpiece reciprocation shutdown on applying forging force. Workpiece forging is performed in two steps. At first stage, forging is combined with ultrasound processing at 10 Hz to 100 Hz. At forging second step, ultrasound processing is shutdown. Application pressure in welding varies from 30 MPa to 180 MPa, while forging pressure at first and second steps varies from 160 MPa to 320 MPa. Forging first step interval makes 0.1 s-1.5 s, while that of second step makes 0.2-2 s. Coefficient of welding specific power input varies from 2.2 kW to 3.2 kW.

EFFECT: forging combined with machining, higher quality and performances.

7 cl, 6 dwg, 1 ex