Patent ID: 8550004

Claim:
An insensitive munition (IM) type, cartridge comprising: a propellant filled, steel, cartridge body having a base with a bore extending therethrough; a steel base plug containing centrally therein a primer pocket, the base plug being located within said bore; said base plug being held within said bore by a eutectic solder, whose eutectic point is from about 220 to about 250 degree F., which solder binds the base plug into the cartridge body such that the plug will remain intact within the bore during ignition and firing of the cartridge; and wherein, the base plug is held within said bore by a plurality of separate solder filled sections; and wherein, a portion of the base of the cartridge body extends as a first shoulder into said bore and there is a corresponding shoulder portion of said base plug that extends, aligns, and mates with that first shoulder to form an abutment; and wherein there is at least one solder filled section located between that abutment and the propellant filled cartridge body, and there is at least one solder filled section located between that abutment and the base end of the cartridge; and whereby, if the propellant filled cartridge is subjected to an unforeseen thermal or kinetic within the cartridge body, the solder bond between the base plug and the cartridge body will melt and the base plug will be expelled from the bore, providing venting of the propellant, preventing the propellant from exploding.