L'air Liquide, Soci&#xe9;t&#xe9; Anonyme Pour L'etude Et L'exploitation Des Proc&#xe9;d&#xe9;s Georges Claude

L'air Liquide, Societe Anonyme a Directoire Et Conseil De Surveillance Pour L'etude Et L'exploitation Des Procedes Georges Claude

L'air Liquide, S.a.

L'air Liquide, Soci&eacute;t&eacute; Anonyme &aacute; Directoire Et Conseil De Surveillance Pour L'etude Et L'exploitation Des Proc&eacute;d&eacute;s Georges Claude

L'air Liquide, Soci&eacute;t&eacute; Anonyme {overscore (a)} Directoire Et Conseil De Surveillance Pour L'etude Et L'exploitation Des Proc&eacute;d&eacute;s Georges Claude

Philippe Lefebvre

Karim Chouf

Thomas Jouanneau

Francis Briand

Eric Verna

Jean-Marie Fortain

Isabelle Debecker

Gerard Plottier

Christian Bonnet

Jean-Yves Mouton

Laurent Biskup

The invention relates to a laser nozzle that can be used in laser cutting, notably with a fibre or disc laser, comprising a nozzle body comprising an axial housing passing axially through said nozzle body and comprising a first outlet orifice situated at the front face of the nozzle body, and a movable element comprising a skirt-forming front part arranged in the axial housing of the nozzle body, said movable element being capable of translational movement in the axial housing of the nozzle body and comprising an axial passage with a second outlet orifice opening onto the skirt-forming front part.

Laser nozzle with mobile element

Laser nozzle usable for laser cutting, especially with a fiber or disk laser, comprising: a nozzle body comprising an axial housing passing axially through the nozzle body and comprising a first output orifice located in the front side of the nozzle body; a movable element able to move in translation in the axial housing in the direction of the first output orifice under the effect of a gas pressure acting on the movable element; and an elastic element arranged in the axial housing, between the nozzle body and the movable element, the elastic element exercising an elastic return force on the movable element tending to oppose the translation movement in the axial housing in the direction of the first output orifice.

Laser nozzle comprising an element movable in a gas layer

A laser nozzle comprising a nozzle body () comprising a first axial housing () comprising a first outlet orifice () located in a front face () of the nozzle body (); a movable element () arranged in the first axial housing () of the nozzle body (), comprising a front portion () forming a skirt and an axial passage () having a second outlet orifice () emerging from said front portion () forming a skirt; and an elastic element () arranged in the first axial housing (), between the nozzle body () and the movable element (). According to the invention, the movable element () is able to move translationally in the first axial housing () in the direction of the first outlet orifice () under the effect of a gaseous pressure exerted on the movable element (), and the elastic element () exerts an elastic return force on the movable element () tending to oppose the translational movement in the first axial housing () in the direction of the first outlet orifice (). Furthermore, the nozzle furthermore comprises an external cover () forming a sleeve around all or some of the nozzle body (). Focusing head and associated laser cutting apparatus. Laser beam cutting process employing a nozzle according to the invention, a laser focusing head according to the invention or an apparatus according to the invention.

Laser nozzle having an internal mobile element and an external cover

The invention relates to a nozzle for laser cutting comprising a nozzle body () comprising an axial housing () and a first outlet orifice () situated in the region of the front face () of the nozzle body (), a mobile element () arranged in the axial housing () of the nozzle body (), comprising a skirt-forming front part () and comprising a second outlet orifice (), said mobile element () being able to be moved in a translational movement inside the axial housing () toward the first outlet orifice () under the effect of a gas pressure applied to the mobile element () until such time as the skirt-forming front part () of the mobile element () projects out from the axial housing () through the first outlet orifice (), and an elastic element () arranged in the axial housing (), between the nozzle body () and the mobile element (), applying an elastic return force to the mobile element (). According to the invention, the front part () comprises an end portion () the outside diameter of which decreases progressively toward the second outlet orifice (). Focusing head and associated laser cutting installation. Laser-beam cutting method employing a nozzle according to the invention, a laser focusing head according to the invention or an installation according to the invention.

Laser nozzle with mobile element of improved external profile

The invention relates to a nozzle for laser cutting, comprising a nozzle body () comprising a first axial housing (), a movable element () formed from an electrically insulating material and comprising a second axial housing (), said movable element () being arranged in the first axial housing (), and an elastic element () arranged in the first axial housing () between the nozzle body () and the movable element (). According to the invention, the nozzle furthermore comprises an insert () comprising an axial passage () and a front portion () forming a skirt that protrudes out of the second axial housing (), said insert () being arranged in the second axial housing () of the movable element () and formed from an electrically conductive material. Associated laser head and apparatus. Laser cutting process employing such a nozzle.

Laser nozzle having an external mobile element made of electrically insulating material and an insert made of electrically conductive material

The invention relates to a nozzle for laser cutting, comprising a nozzle body () comprising a first axial passage (); an external cover () comprising an axial housing (), the nozzle body () being arranged at least partially in said axial housing (); a movable element () comprising a second axial passage () and a front portion () forming a skirt, said movable element () being arranged between the external cover () and the nozzle body () and being translationally movable in the axial housing () of the external cover (); and an elastic element () arranged in the axial housing (), between the external cover () and the nozzle body (). According to the invention, the movable element () is able and designed to move translationally in the axial housing () in the direction of the first outlet orifice () under the effect of a gaseous pressure of said assistance gas (), said pressure being applied in said axial housing () and exerted on said movable element (), said elastic element () exerting an elastic return force on the movable element () tending to oppose the translational movement of the movable element (). Associated laser head and apparatus. Laser cutting process employing such a nozzle.

Laser nozzle having an external mobile element

The invention relates to a method for the laser welding of metal parts that comprises generating a CO2 laser beam, dispensing a protection gas jet made of said gas or gas mixture in the direction of the junction plane between the parts, melting and evaporating the metal of the metal parts with the laser beam in order to generate a metal vapor capillary with the simultaneous generation of a metal plasma that propagates outside the metal vapor capillary and thus forms a metal plasma plume above said junction plane. The protection gas jet is further directed towards the metal plasma plume forming above the junction plane. The gas jet is preferably directed so that the latter comes flush with the top of the metal plasma plume and impinges on the part(s) at a location where the metal of said parts has not been molten by the beam.

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The invention relates to a method for welding with a laser beam, using a welding nozzle comprising: a nozzle body having an axis and including at least an upper surface, a lower surface and a peripheral wall; an axial cavity extending between the upper and lower surfaces of the nozzle body so as to define an outer channel recessed from the surface of said peripheral wall; and a plurality of inner passages drilled through the nozzle body between the upper and lower surfaces. The laser welding method of the invention provides a dynamic gas jet mechanically interacting with the molten metal bath, and further enables better control of the bath hydrodynamic flows, and thus better laser-welding efficiency.

Method for laser welding using a nozzle capable of stabilizing the keyhole

A method and an apparatus for welding with a laser beam. A shielding gas mixture of nitrogen and helium is used and the proportions of the component gases are modified depending on the laser beam's power or power density. Plasma formation in the shield gas is minimized by increasing the proportion of helium as the laser beam's power or power density increases.

Binary gas mixture for welding using a laser beam of up to 12 kW, consisting of 30% to 60% nitrogen by volume, the remainder (up to 100%) being helium. Application of this gas mixture to the welding of steel, stainless steel or titanium.

Use of helium/nitrogen gas mixtures in up to 12 kW laser welding

Process for welding together the two longitudinal edges of a sheet of austenitic, ferritic or martensitic stainless steel so as to obtain a welded pipe, employing at least one laser beam having a power ranging up to 12 kW, and in which a gas mixture is used that consists of 30% to 80% nitrogen by volume and of helium for the remainder (up to 100%). The stainless steel sheet has a thickness of 0.5 to 4 mm and the pipe obtained has a diameter of 5 mm to 50 cm. The welding is full-penetration welding.

Use of helium/nitrogen gas mixtures for the laser welding of stainless steel pipes

Method of welding tailored blanks consisting of a material mostly containing steel and a proportion greater than 0.015% aluminium by weight, using at least one laser beam, in which at least one weld joint of the full-penetration type is made using a gas mixture consisting of 30% to 80% nitrogen by volume, the rest being helium (up to 100%) in order to assist the said laser beam. The method of the invention is particularly recommended for welding motor vehicle elements, especially bodywork, doors, bonnets or the like.

Use of helium/nitrogen gas mixtures for laser welding tailored blanks

Binary gas mixture for welding using a laser beam of up to 8 kW, consisting of 60% to 80% nitrogen by volume, the remainder (up to 100%) being helium. Application of this gas mixture to the welding of steel, stainless steel or titanium.

Use of helium/nitrogen gas mixtures in up to 8kW laser welding

Hybrid welding process using a laser beam and an electric arc to produce a weld bead. The electric arc is established between an electrode connected to a first pole of a current source and at least one workpiece to be welded and connected to a second pole of a current source via at least one electrically conducting earth contactor in contact with the workpiece to be welded. To obtain effective welding, a contact is made between the earth contactor and the workpiece to be welded laterally and/or upstream of the point of impingement of the electric arc on the workpiece(s) to be welded, and considering the direction of formation of the welded joint, so as to balance the forces associated with the induced electromagnetic field acting on the puddle of liquid metal.

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Meulan, France

Philippe Lefebvre