ISO 3834-1:2005 provides criteria to be taken into account for the selection of the appropriate level of quality requirements for fusion welding of metallic materials, among the three levels specified in ISO 3834-2:2005 ISO 3834-3:2005 and ISO 3834-4:2005. It applies to manufacturing, both in workshops and at field installation sites. ISO 3834-1:2005 does not specify requirements for a total quality management system. However, quality management system elements where their inclusion will complement ISO 3834 are defined.