This specification provides for the qualification of friction welding machines, procedures, and training of welding operators. Qualification of the welding procedure specification (WPS) includes the material specifications involved, weld joint design, destructive and nondestructive testing requirements, as well as guidelines for different categories of quality assurance. Qualification of welding equipment includes weld parameter control, weld reproducibility, and basic safety requirements. Welding operators require training in the proper operation of friction welding equipment and general safety procedures. The requirements for requalification of the WPS and equipment are also given.