METHOD OF DIFFUSION WELDING OF BILLETS MADE OF OT4-1 TITANIUM ALLOY Russian patent published in 2013 - IPC B23K20/14 B23K103/14 

FIELD: process engineering.

SUBSTANCE: invention relates to pressure welding, particularly, to diffusion welding at low-intensity power effects and may be used for making thin-wall structures from OT4-1 titanium alloy. Proposed method comprises heating to welding temperature, jointing two work pieces for time sufficient for making a physical contact between surfaces to be jointed together. Heating at first stage is performed with application of welding pressure for development of 3D interaction. At second stage, heating is performed with application of welding pressure. At said first stage heating is performed in conversion temperature range α+β→β for time τ_w defined as follows: τ_w=k·p^-n·exp(E/RT)·lnR_a, where k is empirical factor describing kinetics of the development of physical contact area between surfaces to be jointed equal to 1.75·10^-7 s, p is numerical magnitude of welding pressure, MPa, n is empirical factor describing material creepage equal to 1,2, E is activation energy, J/mol, R is gas constant, J/(K·mol), T is heating temperature, K, R_a is numerical value of surface roughness.

EFFECT: decreased accumulates strain in work pieces, power savings.

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