NF EN ISO 11970, A32-040 (11/2025)

ISO 11970:2016 specifies how to qualify a welding procedure specification (DMOS) for production welding of cast steel parts. It defines the conditions for carrying out qualification tests and the limits of validity of a qualified operating mode, for all practical welding operations within the limit of variation of the essential parameters considered. Tests are intended to be carried out in accordance with this International Standard, unless additional tests are specified by the purchaser or by agreement between the contracting parties. ISO 11970:2016 applies to arc welding of cast steel parts. The principles of this International Standard may be applied to other fusion welding processes, subject to prior agreement between the contracting parties. In the case of a specific use, material or manufacturing conditions, more extensive testing than those specified by this International Standard may be requested by the purchaser, in order to obtain more information, e.g. longitudinal tensile tests in the weld, bending tests, chemical analyses, determination of the ferrite rate in austenitic stainless steels, elongation, Charpy “V” impact bending tests and radiographic checks.
(Automatic translation from French)