Core welding wire with low nitrogen content

B - Operations – Transporting – 23 – K

Patent

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Details

B23K 9/173 (2006.01) B23K 35/30 (2006.01)

Patent

CA 2291694

The invention concerns a core wire for welding under a protective gas flow, in particular of the rutile or slagless type, comprising an outer metal sheath and a central core comprising filler elements and a method for MAG welding under a protective gas flow using such a core wire to produce a weld joint on a steel structure, such as an offshore platform or a storage tank. The resulting weld joint has improved impact strength and a toughness and contains less than 65 ppm of nitrogen, 300 ppm to 0.12 % carbon, 0.01 % to 0.6 % silicon, 0.9 % to 1.9 % manganese, 20 ppm to 0.08 % titanium, 1 ppm to 80 ppm of boron, 5 ppm to 150 ppm of aluminium, 10 ppm to 0.02 % niobium, and 10 ppm to 0.02 % vanadium.

Un fil fourré pour le soudage sous flux gazeux de protection, notamment de type ru-tile ou sans laitier, comportant une enveloppe métallique externe et une âme centrale comprenant des éléments de remplissage et un procédé de soudage MAG sous flux gazeux de protection utilisant un tel fil fourré pour réaliser un joint de soudure sur une construc-tion en acier, telle une plate-forme offshore ou une cuve de stockage. Le joint de soudure obtenu présente une résilience et une ténacité améliorées et contient moins de 65 ppm d'azote, de 300 ppm à 0,12 % de carbone, de 0,01 % à 0,6 % de silicium, de 0,9 % à 1,9 % de manganèse, de 20 ppm à 0,08 % de titane, de 1 ppm à 80 ppm de bore, de 5 ppm à 150 ppm d'aluminium, de 10 ppm à 0,02 % de niobium, et de 10 ppm à 0,02 % de vanadium.

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