METHOD OF OBTAINING OBJECTS WITH INNER CAVITIES THROUGH EXPLOSION WELDING Russian patent published in 2009 - IPC B23K20/08 

FIELD: welding works.

SUBSTANCE: present invention can be used for making objects with inner cavities, for example, heat exchangers, components of electro-thermal and chemical equipment, heat regulators etc. Cavity-forming elements are coaxially put into metallic pipe-shaped reinforcement layers with inner diametre 2.4-4 mm greater than the outer diametre of the cavity-forming elements. From the obtained assembly, a flat packet is made with welding gaps between adjacent metallic pipe-shaped reinforcement layers equal to 0.4-1.2 mm. The packet is put between puncheons with thickness 1.5-1.7 times the thickness of the walls of the pipe-shaped reinforcement layers. Separation layers from polymer material with thickness of 50-100 mcm are pre-deposited on the surface of the puncheons. Explosive welding is done at velocity of detonation of explosive equal to 1970-2950 m/s.

EFFECT: method allows for obtaining in a single cycle, a quality welded object with high-strength joints between its elements and air-tightness of adjacent cavities; the inner cavity has the desired oval shape.

4 cl, 5 dwg, 1 tbl, 4 ex