DIFFUSION WELDING OF NICKEL-BASED CASTABLE REFRACTORY ALLOY Russian patent published in 2015 - IPC B23K20/14 B23K103/08 

FIELD: metallurgy.

SUBSTANCE: elements for welding are assembled and evacuated. Elements are heated to temperature defined from the following ratio: 0.987T_s < T_weld < 1.001T_lm, where T_lm is temperature of local melting of foundry alloy, T_weld is welding temperature, T_s is solidus temperature while compression is performed by welding force of 1-3.5 kg/mm² that allows a macro plastic deformation for time required for welding of 0.5-2.5 hours. Then, welding force is removed and part is cooled to the room temperature at the rate of 30-50°C/min.

EFFECT: weld of required quality, preserved recrystallized structure, simplified part structure owing to the use of diffusion welding, better manufacturability, decreased part weight.

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