This part of ISO/TR 17671 may be used for the electron beam welding (process No. 51 in accordance with ISO 4063) of weldable metallic materials in accordance with ISO/TR 15608 (see Annexes A and B). It does not contain data on permissible stresses on weld seams or on the testing and evaluation of weld seams. Such data can either be seen from the relevant user standards or should be separately agreed upon between the contracting parties. A requirement for the application of this part of ISO/TR 17671 is that the recommendations be used by appropriately trained and experienced personnel.