Abstract: The invention relates to an exchanger-reactor comprising at least three stages with at least one stage comprising both: millimetric channels at least partially covered with a catalyst for stimulating a steam reforming reaction, and millimetric channels at least partially covered with a catalyst for stimulating a water gas reaction.

Abstract: A single-component exchanger permitting a transfer of heat between a first fluid and a second fluid is provided. The heat exchanger includes, from bottom to top in the direction of manufacture; at least two distribution regions, at least two collection regions, at least two inlet connectors adjoining the at least two distribution regions and at least two outlet connectors adjoining the at least two collection regions. The heat exchanger also includes at least one inlet located on each inlet connector, at least one outlet located on each outlet connector, and an exchange region permitting a transfer of heat between the channels of the first fluid and the channels of the second fluid. Each connector includes supports in the inner upper part thereof.

Abstract: A single-component exchanger-reactor including, from bottom to top in the direction of manufacture a distribution region, an inlet connector and an outlet connector, each in the form of a half cylinder and adjoining the distribution region on either side; an inlet located on the front face of the inlet connector, an outlet located on the front face of the outlet connector; an exchange region consisting of reactive channels and product channels; with each connector including supports in the inner upper part thereof.

Abstract: A single-component exchanger-reactor including, from bottom to top in the direction of manufacture a distribution region, an inlet connector and an outlet connector, each in the form of a half cylinder and adjoining the distribution region on either side; an inlet located on the front face of the inlet connector, an outlet located on the front face of the outlet connector; an exchange region consisting of reactive channels and product channels; with each connector including supports in the inner upper part thereof.

Abstract: The invention relates to a heat exchanger-reactor or heat exchanger including at least three stages with on each stage at least one area of millimetric channels that promote the exchange of heat and at least one distribution area upstream and/or downstream of the area of millimetric channels. The invention is characterized in that: said heat exchanger-reactor or heat exchanger is a component devoid of assembly interfaces between the various stages; and the channels in the area of millimetric channels are separated by walls less than 3 mm thick.

Abstract: The invention relates to an exchanger-reactor comprising at least three stages with at least one stage comprising both: millimetric channels at least partially covered with a catalyst for stimulating a steam reforming reaction, and millimetric channels at least partially covered with a catalyst for stimulating a water gas reaction.

Abstract: Reactor-exchanger comprising at least 3 stages with, on each stage, at least one area promoting the heat exchanges and at least one distribution area upstream and/or downstream of the area promoting the heat exchanges, characterized in that the area promoting the heat exchanges comprises cylindrical millimetric channels, there being 1 to 1000 of said channels with a length of between 10 mm and 500 mm.

Abstract: Disclosed is a reactor-exchanger or an exchanger comprising at least 3 levels, each of which includes at least one region with millimeter channels promoting heat exchange and at least one distribution region upstream and/or downstream of the region with millimeter channels, characterized in that the reactor-exchanger or exchanger is a unit that has no mounting interfaces between the various levels.

Abstract: Process for laser welding at least one metal workpiece (1) by a laser beam (3), the workpiece having a surface coating (2) containing aluminum, characterized in that the laser beam (3) is combined with at least one electric arc (4) so as to melt the metal and actually weld the workpiece(s).

Abstract: The invention relates to a compact catalytic reactor comprising at least three plates with at least one area of millimetric channels on each plate, promoting heat exchange, and at least one distribution area upstream and/or downstream of the area of millimetric channels, the channels being separated by walls. The distribution areas are characterized by: the discontinuity of the walls along the distribution area on the side of the inflow of gaseous flows or on the side of the outflow thereof; and the increase in the width of the walls along the distribution area on the side of the inflow of gaseous flows or on the side of the outflow thereof.

Abstract: 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.

Abstract: The invention relates to an electric arc welding method for welding at least one metal part including an aluminum based surface coating, using a shielding gas. According to the invention, the metal of the aforementioned metal part is melted by the electric arc alone without the use of any laser beam. The invention is characterized in that the shielding gas comprises a mixture of argon and/or helium, nitrogen, and an oxidizing compound selected from oxygen and carbon dioxide.

Abstract: 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 bath, to which molten metal is supplied by melting a filler wire, wherein the welding bath is provided on at least one steel part including an aluminum surface coating, and a protective gas is used, characterized in that the protective gas consists of at least one main compound selected from argon and helium, and of at least one additional compound selected from nitrogen and oxygen.

Abstract: The invention relates to a method for electric arc welding, without a laser beam, one or more metal parts, in particular made of steel, including an aluminum surface coating, in particular a coating consisting of aluminum and silicon, using a protective gas, characterized in that the protective gas consists of a mixture of argon and/or helium, and additionally of nitrogen, in particular less than 30 volume % of nitrogen, typically 2 to 10 volume % of nitrogen.

Abstract: 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.

Abstract: Process for laser welding at least one metal workpiece (1) by a laser beam (3), the workpiece having a surface coating (2) containing aluminum, characterized in that the laser beam (3) is combined with at least one electric arc (4) so as to melt the metal and actually weld the workpiece(s).

Abstract: The invention relates to a process for laser welding at least one metal workpiece (1) by a laser beam (3), said workpiece having a surface coating (2) containing aluminium, characterized in that the laser beam (3) is combined with at least one electric arc (4) so as to melt the metal and actually weld said workpiece(s).

Abstract: The invention relates to a process for the braze-welding of steel workpieces using a laser beam, for example of the Nd:YAG, CO2, fibre or diode type, a consumable wire being the filler metal, and a gas mixture as gas shield, so as to produce a braze-welded joint between the workpieces. The consumable wire is based on copper and the gas mixture contains 40 to 60% oxygen and at least one gas chosen from argon, nitrogen and helium for the remainder.

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.