I think it is appropriate to ask if you need to test to a particular code. The question must be answered to determined if a third party can qualify the procedure for you. Codes such as ASME or a military welding standard requires you to have your welder, an employee, to actually do the welding. While the NDT, and destructive tests can be performed by a third party, the welding can't be delegated to a third party.
Best regards - Al