METHOD OF THERMAL TREATMENT OF WELD JOINTS PRODUCED BY LINEAR FRICTION WELDING Russian patent published in 2015 - IPC C21D9/50 B23K20/12 F01D5/34 

FIELD: metallurgy.

SUBSTANCE: weld joint is heated by sending an electric current via a weld joint up to 10 kA as current leads are fixed at different sides relative to the weld seam on the process lap of a blade and a blisk. In the process of thermal treatment they measure the temperature of the weld joint surface and adjust it by the variation of the current value within 540-620°C. The maximum permissible heating temperature is set with the condition of saving the fine-grained structure of the weld joint. The minimum permissible temperature is set with the condition of removal of residual welding stresses in a weld joint. Thermal treatment is carried out with AC current with thyristor regulation of its value.

EFFECT: invention makes it possible to increase the efficiency of removal of residual stresses of joints due to the reduced distortion of the blisk profile, and also to increase the efficiency of thermal treatment due to direct heating of the entire cross section of the weld joint by electric current of a high value.

3 cl, 1 dwg