METHOD TO PRODUCE PROJECTILE CASINGS Russian patent published in 2010 - IPC B21K21/06 F42B12/20 

FIELD: weapons and ammunition.

SUBSTANCE: method to produce small-caliber common projectile casings comprises forming the chamber by multi-pass extrusion of low-carbon rod stock and electric arc build-up of driving band. Driving band from copper filler wire is deposited by welding torch with two non-consumable cathode electrodes and sliding current contact spring arranged symmetric about said electrodes below projectile casing on feeding circulating cooling fluid into the chamber via coaxial tube with end face bevelled towards cathode electrodes. Electric welding arcs are excited electrodes for 0.5-0.8 s at current of 0.4-0.5 of build-up rated current. Then current is increased to rating and filler wires are fed onto rotating projectile casing.

EFFECT: increased quality.

1 dwg