METHOD OF SEAM FRICTION WELDING OF BILLETS FROM TITANIUM ALLOWS FOR TURBOMACHINE MONOBLOCKS Russian patent published in 2012 - IPC B23K20/12 F01D5/30 B23P15/04 

FIELD: process engineering.

SUBSTANCE: invention may be 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. At welding first step, amplitude is set to 3 mm to 5 mm while frequency makes 15-70 Hz. At welding second step, amplitude is set to 1 mm to 2 mm while frequency makes 40-80 Hz. Application pressure varies from 30 MPa to 180 MPa while that of forging varies from 160 MPa to 320 MPa. Coefficient of welding specific power input varies from 2.2 kW to 3.2 kW.

EFFECT: high quality of weld joint.

7 cl, 1 ex