Each Manufacturer, Fabricator, or Repair Organization is responsible for the weldingdone and shall conduct the tests required in this clause. It is not permissible for the Manufacturer, Fabricator, or Repair Organization to have the welding of the test weldments performed by another organization. It is permissible, however, to subcontract any or all of the work of preparation of test materials for welding, and subsequent work on preparation of test specimens from the completed weldment, performance of nondestructive examination, and mechanical tests, provided the Manufacturer, Fabricator, or Repair Organization accepts the responsibility for any such work.