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

La Soudure Autogene Francaise

Other

L'air Liquide, S.a.

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

Sauvageau Commercy Soudure

La Soudure Autogene Francais

Université D'orleans

Air Liquide Welding France

Francis Briand

Karim Chouf

Philippe Lefebvre

Christian Bonnet

Thomas Jouanneau

Eric Verna

Olivier Dubet

Isabelle Debecker

Hakim Maazaoui

Georges Caillibotte

Jean-Pierre Eyschen

Christophe Mas

Corinne Chovet

G&eacute;rard Plottier

Jean-Pierre Vincent

Nadia Pellerin

Gaia Ballerini

Elodie Moine Galand

Flavien Valensi

Stéphane Pellerin

Charles De Izarra

Karol Musiol

The invention relates to a laser cutting method for cutting a stainless steel workpiece using laser beam generation means comprising a silica fiber with an ytterbium-doped core to generate the laser beam. Preferably, the laser beam generated by the ytterbium-based fiber has a wavelength between 1.07 and 1.09 &#x3bc;m, a quality factor of the laser beam is between 0.33 and 8 mm&#xb7;mrad, and the laser beam has a power of between 0.1 and 25 kW. The assistance gas for the laser beam is chosen from nitrogen, helium, argon and mixtures thereof, and, optionally, it further contains one or more additional compounds chosen from O, CO, Hand CH.

Method for cutting stainless steel with a fiber laser

Process for laser welding at least one metal workpiece () by a laser beam (), the workpiece having a surface coating () containing aluminum, characterized in that the laser beam () is combined with at least one electric arc () so as to melt the metal and actually weld the workpiece(s).

Process for laser-arc hybrid welding aluminized metal workpieces

The invention relates to a hybrid laser/arc-welding method using an electric arc and a laser beam that are combined together within a single welding melt to which molten metal is supplied by melting a filler wire, wherein the welding melt is provided on at least one steel part including an aluminum surface coating, and a protective gas is used, characterized in that the filler wire contains at least 3 wt % of one or more gammagenic elements, in particular the gammagenic elements selected from C, Mn, Ni and N, and the protective gas consists of helium and/or argon with the addition of at least 10 vol % of nitrogen or oxygen. The method of the invention is particularly suitable for welding end-welded flanks used in the field of manufacturing automobiles or for tube welding.

Hybrid arc/laser-welding method for aluminized steel parts using gammagenic elements and a gas containing less than 10% of nitrogen or oxygen

The invention relates to a laser cutting method for cutting a C&#x2014;Mn steel workpiece, characterized in that laser beam generation means comprising at least one silica fiber with an ytterbium-doped core is used to generate the laser beam. Preferably, the ytterbium-based fiber has a wavelength between 1.07 and 1.1 &#x3bc;m, preferably 1.07 &#x3bc;m, the quality factor of the laser beam is between 0.33 and 8 mm.mrad, and the laser beam has a power of between 0.1 and 25 kW. The assistance gas for the laser beam is chosen from nitrogen, helium, argon, oxygen, COand mixtures thereof, and, optionally, it further contains one or more additional compounds chosen from Hand CH.

Method for cutting C&#x2014;Mn steel with a fiber laser

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.

[object Object]

Methods for hybrid laser/MIG welding processes. A bevel formed between the edges of material to be welded together is partially filled with molten metal. The molten metal is delivered in the form of a filler wire, which is melted by a combined electric arc and laser beam. The welding speed is at least 2 m/min, the filler wire feed speed is at least 20 m/min and the filler wire diameter is less than 1.2 mm.

Laser/MIG hybrid welding process with a high wire speed

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

Process for the arc welding in pulsed mode of one or more workpieces made of carbon steel, stainless steel, aluminum or aluminum alloy, with the use of a gas shield, in which an electric arc welding torch is supplied with at least one consumable wire at a wire feed speed (V ) and the consumable wire is subjected to current pulses, in order to melt the end of the consumable wire in which, for a given pulse frequency, a wire feed speed (F ), a mean current (I ) value and an rms current (I ) value are chosen, so as to detach one drop of molten metal per current pulse and to obtain a low degree of spatter.

Pulsed-arc welding process and device

Process for manufacturing a welded pipe from a metal strip having two longitudinal edges approximately parallel to each other, which are brought together so as to come approximately into contact with each other and thus form an unwelded pre-tube, the pre-tube then being welded in order to join the edges together. The two edges are welded together to obtain a welded metal pipe by using, approximately simultaneously, at least one laser beam and at least one electric arc, that is to say using a hybrid arc/laser, preferably plasma/laser, welding process. This process can be used to produce weld seams of rectilinear, helicoidal or spiraled shape.

Application of a hybrid arc/laser process to the welding of pipe

Hybrid welding process and unit for welding metal workpieces, such as tailored blanks, by using a laser beam and an electric arc, preferably a plasma arc, in which process, after a welded joint has been produced, the laser beam is sent and/or deflected into radiation absorption means, such as an absorption cavity, allowing the radiation of the said beam to be absorbed. The beam continues to be deflected during the welding stop phase after producing one welded joint and before starting to weld a second welded joint. The process and the unit of the invention are particularly suitable for the mass production of workpieces for the motor-vehicle industry, such as tailored blanks that can be used to manufacture, for example, motor-vehicle body components, or for the mass production of pipes.

Hybrid electric-arc/laser welding process, especially for the welding of pipes or motor-vehicle components

A method and a device for pulsed arc welding in which the electric current has conductance with pulse drops and/or pulse rises between 50 A/ms and 1000 A/ms, and more particularly between 100 A/ms and 500 A/ms, with the exception of a triangular pulse. The invention is applicable to MIG or MAG welding.

Method and device for pulsed arc welding

Protective mask which can be used in a welding operation, comprising a facial protection element, holding elements, a unit for capturing and transmitting the image, and a device for displaying the image, these being linked to the unit for capturing and transmitting the image.

Growing community of inventors

Paris, France

Francis Briand