Certificate Certificate quality management system DIN EN ISO 9001:2015 Certificate welding-technoligie DIN EN ISO 3834-2 Technology approval: 135 (MAG) – Kehlnaht, PB, Materialgruppe: 3.1 (S690QL), t= 7,5-18mm 135 (MAG) – X-Naht, PA, Materialgruppe: 3.1 (S690QL), t= 3-24mm