Abstract: A method and system for handling media at a communication entity, wherein the media is associated with a communication session that is capable of entering an active state and an inactive state. The method comprises determining when the communication session is in an inactive state, causing the media associated with the communication session to be stored when the communication session has entered an inactive state, and causing the stored media to be conveyed to a user of the communication entity upon determination that the communication session has re-entered an active state.

Abstract: 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.

Abstract: The invention relates to a welding process using a laser beam (FL1, FL2) to weld at least one metal workpiece, preferably to weld two metal workpieces together, in which: a first laser beam (FL1) is employed and said first laser beam (FL1) is focused so that it strikes at least one workpiece to be welded and creates a keyhole-type capillary (KH) having a keyhole opening; a second laser beam (FL2) is used and said second laser beam (FL2) is focused in the keyhole (KH) opening created by said first laser beam (FL1); and the workpiece or workpieces are progressively welded by melting the metal of the workpiece or workpieces to be welded at the points of impact of the laser beams (FL1, FL2) with the workpiece or workpieces to be welded. The depth of penetration (x) of the first laser beam (FL1) is greater than the depth of penetration (y) of the second laser beam (FL2).

Abstract: The porous material of the present invention is produced by heating a dry powder mixture, containing mainly an organic solid binder and inorganic particles. The mixture is foamed while the organic binder is melted. Foaming comes from a foaming agent in the powder mixture. The solid foamed structure comprising inorganic particles embedded in an organic binder is then heated to eliminate the organic binder and finally to sinter the remaining inorganic tri-dimensional network into a rigid structure having interconnected porosity.

Abstract: 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.

Abstract: 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.

Abstract: A method for welding metal work pieces with a CO2 type laser. A first shielding gas is used on the topside of the work piece, a second shielding gas is used on the backside of the work piece. The first and the second shielding gases have different compositions. A full penetration weld joint is produced by at least a laser beam which is delivered from the topside of the work piece. A plasma, which contributes to the production of the welded joint, is created in the second plasma gas.

Abstract: A method for the hybrid laser-arc welding of several metal workpieces. The welding process uses at least one laser beam and at least one electric arc. The metal workpieces are stacked in a multiple-thickness configuration and the laser beam and the electric arc are used to weld the edges of the multiple-thickness configuration.

Abstract: 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.

Abstract: The porous material of the present invention is produced by heating a dry powder mixture, containing mainly an organic solid binder and inorganic particles. The mixture is foamed while the organic binder is melted. Foaming comes from a foaming agent in the powder mixture. The solid foamed structure comprising inorganic particles embedded in an organic binder is then heated to eliminate the organic binder and finally to sinter the remaining inorganic tri-dimensional network into a rigid structure having interconnected porosity.

Abstract: The invention relates to a laser beam welding method and installation that makes use of a protective gas mixture containing argon and helium. The proportion of argon and/or helium in said gas mixture is chosen or adjusted according to the power or the power density of the laser beam. The laser power is included between 0.5 kW and 30 kW and, preferably, between 5 kW and 20 kW. The protective gas mixture comprises argon and/or helium and, preferably, the gas mixture contains a volume proportion of helium of between 30% and 80%, the remainder being argon and, possibly, inevitable impurities.

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: The porous material of the present invention is produced by heating a dry powder mixture, containing mainly an organic solid binder and inorganic particles. The mixture is foamed while the organic binder is melted. Foaming comes from a foaming agent in the powder mixture. The solid foamed structure comprising inorganic particles embedded in an organic binder is then heated to eliminate the organic binder and finally to sinter the remaining inorganic tri-dimensional network into a rigid structure having interconnected porosity.

Abstract: 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.