Method for striking electric arc in hybrid laser-arc welding

B - Operations – Transporting – 23 – K

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B23K 26/14 (2006.01) B23K 28/02 (2006.01)

Patent

CA 2460091

The invention concerns a hybrid arc-laser method for welding one or several metal parts to be welded, such as the edges of a tube or tailored blanks by producing a weld joint between the edges to be welded, said weld joint being obtained by using at least a laser beam and at least an electric arc combined with each other so as to melt and subsequently solidify the metal along the edges to be welded. Said method consists in (a) striking at least an electric arc, using at least an electrode powered with electric current, in the presence of a starting gas composition containing at least 50 % by volume of argon to obtain sparking of a pilot arc; (b) transferring the pilot arc sparked at step (a) to the parts to be welded; and (c) emitting towards the welding zone a protective gaseous atmosphere containing at least 50 % by volume of helium to protect at least part of the welding zone and welding the weld joint, in the presence of said protective gaseous atmosphere, by combining the laser beam and the electric arc. The starting gas composition contains more than 60 % by volume of argon, preferably between 70 and 100 % by volume of argon, and optionally at least an additional non-oxidizing compound selected among helium, H¿2?, N¿2? in a content of 0.05 to 30 % by volume.

Procédé de soudage hybride arc-laser d'une ou plusieurs pièces métalliques a souder, tel des bords d'un tube ou des flancs raboutes (tailored blanks) par réalisation d'un joint de soudure entre des bords à souder, ledit joint de soudure étant obtenu par mise en oeuvre d'au moins un faisceau laser et d'au moins un arc électrique se combinant l'un à l'autre de manière à obtenir une fusion puis une solidification subséquente du métal le long desdits bords à souder, dans lequel on opère (a) un amorçage d'au moins un arc électrique, en utilisant au moins une électrode alimentée en courant électrique, en présence d'une composition gazeuse d'amorçage contenant au moins 50% en volume d'argon pour obtenir l'amorçage d'un arc pilote, (b) un transfert de l'arc pilote amorce à l'étape (a) aux pièces à souder, et (c) un envoi vers la zone de soudage d'une atmosphère gazeuse de protection contenant au moins 50% en volume d'hélium pour protéger au moins une partie de la zone de soudage et soudage du joint de soudure, en présence de ladite atmosphère gazeuse de protection, en combinant le faisceau laser et l'arc électrique. La composition gazeuse d'amorçage contient plus de 60% en volume d'argon, de préférence de 70 a 100 % en volume d'argon, et éventuellement au moins un composé additionnel non oxydant choisi parmi l'hélium, Hz, Nz en une teneur de 0.05 a 30% en volume.

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