The method was found out in the USSR by N.F. Kozakov. It is one of methods of pressure welding. The works 1 (Fig. 5.25) are replaced into vacuum chamber 3, pressed and heated by heater 2. The welding occurs by the mutual diffusion of atoms in the surface layers of the pieces brought in contact.
The advantages of the method are
- the absence of electrodes and fluxes;
- the absence of weld when the same metals are welded;
- the possibility to weld materials which cannot be welded by other methods, for instance, metal and glass, steel and aluminium, etc.
The disadvantages of this method are the following:
- long time of welding (15…25 min);
- welding in vacuum.
Fig. 5.25. Diffusion welding: 1 – works to be welded; 2 – heater; 3 – vacuum chamber
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