Head for welding metal pieces for forming a planar target using yttrium aluminum garnet laser, comprises a body through which a laser beam passes, and a unit for discharging plasma smoke generated by welding through a protection gas

The head for welding metal pieces for forming a planar target (5) using yttrium aluminum garnet laser, comprises a body (4) through which a laser beam (2) passes, and a unit for discharging plasma smoke generated by welding through a protection gas (3). The metal pieces are positioned side by side for focusing the laser beam. The discharge unit comprises a gas supply pipe, and nozzles directing the gas flow in different directions of the target. The nozzles are positioned close to each other, or symmetrical to one another according to the laser beam. The head for welding metal pieces for forming a planar target (5) using yttrium aluminum garnet laser, comprises a body (4) through which a laser beam (2) passes, and a unit for discharging plasma smoke generated by welding through a protection gas (3). The metal pieces are positioned side by side for focusing the laser beam. The discharge unit comprises a gas supply pipe, and nozzles directing the gas flow in different directions of the target. The nozzles are positioned close to each other, or symmetrical to one another according to the laser beam, and direct their gas flow at an angle of 40-42[deg] with the plane of the target. The head body comprises a chamber through which the laser beam is introduced at a pressure relative to ambient pressure. The chamber is closed on the side of the target by a pierced metal ring (6) to pass the laser beam. Tête de soudage, pour le soudage à l'aide d'un laser YAG de pièces métalliques positionnées côté à côte au point de focalisation du faisceau laser (2) pour former une cible plane (5), ladite tête comprenant un corps de tête (4) au travers duquel passe ledit faisceau laser et au moins un moyen de soufflage, par un gaz de protection, de la plume du plasma généré par le soudage, ledit moyen comprenant une canalisation d'amenée du gaz (7) et une buse (8) orientant le flux de gaz en direction de la cible (5), caractérisée en ce que le moyen de soufflage comporte au moins deux buses (8) orientant chacune leur flux dans des directions différentes. Les buses sont préférentiellement positionnées en vis-à-vis, symétriques l'une de l'autre par rapport au faisceau laser (2), et leur direction fait un angle compris entre 40 et 42° avec le plan de la cible (5).