A method of blind welding thermoplastic composite components is provided that includes: providing a first thermoplastic composite having a FTPC bonding surface, a second thermoplastic composite having a STPC bonding surface, and an interface layer; disposing the interface layer between the FTPC STPC bonding surfaces; applying a normal force to the outer surface of the first thermoplastic composite component; applying an electromagnetic field to at least portions of the first and second thermoplastic composite components and the interface layer while the normal force is applied, and maintaining the application of the electromagnetic field until the first and second thermoplastic composite components and the interface layer create a weld pool; and removing the application of the electromagnetic field after the weld pool is created.