Method of bonding rotating bands on projectiles

A method of bonding a thermoplastic rotating band to a metallic projectile body, comprising the steps of:

• designating a band seat zone on a metallic projectile body;
• coating said band seat zone with a sprayed metallic coating, said coating being characterized by (i) having a relatively rough external surface, i.e., a large number of irregularly shaped projections comprising a maze of mechanical attachments to said body, (ii) being about 0.003 inches to 0.012 inches thick so as to be metallurgically continuous, thereby to prevent oxidation of said body at said band seat zone thereof, and (iii) being metallurgically bonded to said projectile body so as to have a metal-to-metal bond strength;
• and
• applying a thermoplastic polymer in liquid form around said zone and to said sprayed metallic coating to form, after hardening, a thermoplastic rotating band, said polymer, while in fluid form, permeating into intimate contact with said irregularly shaped projections so that, after said polymer becomes solid, a high torque transmittal interface is provided between said plastic rotating band and said projectile body.