Welding process validation & CE Mark

Quality requirements for fusion welding of metallic materials Why ISO 3834? Welding is classified as a special process the result of which cannot be always verified by testing after the end of welding. Therefore, the quality of a weld must be checked during the production not by inspections and tests of the finished product, but by suitable management of welding processes. This management may be carried out in accordance with the ISO 3834:2005 standard, which ensures quality of the welds of the final product, which then complies with the specified criteria. This standard forms a background for proving conformity and for certification of products made through welding processes. A certified manufacturer proves fulfilment of all principles of this standard – execution of high-quality welding processes within requirements of product standards or other regulations. ISO 3834-2:2005 (higher level of quality requirements) – intended for products with which safety factors are important together with the level of static and dynamic stress, with materials to be exposed to high stress during the service life of products or if a progressive kind of structural design is involved or new manufacturing procedures not verified in production are involved. ISO 3834-3:2005 (medium level of quality requirements) - intended for a wider range of products with common safety requirements, which could be exposed to a level of average dynamic or static stress, products are mostly made of normal materials of known weldability, with ensured mechanical stability of products and prevention of occurrence of unacceptable defects, while qualified WPS procedures are used and a particular level of checking and testing the weldments. ISO 3834-4:2005 (basic level of quality requirements) - intended for the range of products with basic safety requirements, which are exposed to average static stress, products are made of normal materials of known weldability, mechanical stability of products is ensured.