On July 1, 2009 came into force on the Ministerial Decree 14/01/2008 on New Technical Standards for construction and all stakeholders should ensure the adjustment of its structures in compliance with the new requirements.
The Section 11.3.4.5 about welding process, include the following:
"In relation to the type of artifacts made by welded seams, the manufacturer must be certified according to UNI EN ISO 3834:2006 parts 2 and 4, the level of technical knowledge of staff for the coordination of welding operations must meet the requirements of the legislation validated..."
The series of standards UNI EN ISO 3834 − "Quality requirements for fusion welding of metallic materials" are, to date, the international benchmark for the certification of welding process management systems.
The standard was designed so that it can be used for manufacture in the factory and in building site of any kind of fusion welded construction.
The standard is applicable to a wide range of producers who may for example include:

• companies that manufacture welded construction;
• companies making welded structures for traditional plant applications;
• companies operating in the construction of plants (chemical, petrochemical, power generation, steel, etc.).

The standards UNI EN ISO 9001 and UNI EN ISO 3834 fit perfectly the first being on the management of Quality Systems and the second on the control of welding process.
The UNI EN ISO 3834 can still be self-sufficient, that can be applied alone whenever you wish to organize and manage the quality of welding operations. In fact, welding as a "special process" is relevant to the quality of the artefacts, since it can not be controlled directly but must be built during the production. To this end, special requirements and controls and appropriate expertise before, during and after production are necessary.
The certification of the company and staff will be operated by a third body, chosen, in the absence of regulations, by the manufacturer according to criteria of independence and competence (ref. DM 14/01/2008 - 11.3.4.5).