Vallourec

Centre National De La Recherche Scientifique

European Community (ec)

Centre National De La Recherche Scientifique G.i.s. Madylam

Roland Ernst

Rene J Moreau

Marcel Garnier

Michel Giroutru

Pierre Peytavin

Andre Gueussier

Pascal Colpo

Fran&ccedil;ois Rossi

Jean-Fran&ccedil;ois Daviet

Christian Maugein

An installation for processing by induction a metallic material is disclosed. The installation includes a first winding including, in series, at least one first coil of at least one turn and at least one second coil of at least one turn, wound in opposite directions around a container, the first winding having two end terminals connected to an A.C. supply source and across at first capacitor, and at least one second winding including, in series, at least one first coil of at least one turn and at least one second coil of at least one turn, wound in opposite directions around the container by being imbricated in the first winding, wherein the ends of the second winding being connected across a second capacitor (C&prime;).

Electromagnetic stirring of a melting metal

A plasma processing apparatus comprises a processing chamber having at least one opening for receiving field energy by inductive coupling, and at least one field energy source arranged to induce the field energy into the chamber via the corresponding opening. The field energy source comprises an inductor device associated with a magnetic core. The magnetic core forms a closure and gas seal for the corresponding opening.

Method and apparatus to produce large inductive plasma for plasma processing

The process and apparatus according to the invention relates to the continuous casting of hollow bodies of metals such as aluminium, copper, steels of all types, or other metals or alloys. The process comprises introducing a liquid metal into an annular space between an outer mold and an inner mandrel, the liquid metal being subjected in the vicinity of the mandrel to the action of a movable magnetic field which entrains it in an upward direction. The magnetic field is preferably generated by a magnetic rotor which is disposed in the mandrel. The process is used in particular for producing blanks intended for the production of non-welded pipes and tubes.

Process and apparatus for the production of hollow bodies by

An electrode composed of a mixture of electrochemically active particles and metal powder compressed onto a metal foil strip can be inductively sintered without localized overheating by passing the coated strip through a hairpin-shaped inductor provided with widened portions facing the edge regions of the strip, so as to locally increase the cross section of the hairpin in the portions of the hairpin that are opposed to the edge regions of the electrode strip. This arrangement counteracts the tendency of the edge regions to overheat and thermally damage the active material.

Method of sintering by induction

The process and apparatus according to the invention concern continuous casting of hollow bodies of metals such as aluminum, copper, steels of all types, or other metals or alloys. The process comprises introducing the liquid metal into an annular space between an outer mold and an inner mandrel, the liquid metal being subjected in the vicinity of the mandrel to the action of a movable magnetic field which entrains it in an upward direction. The magnetic field is preferably generated by a magnetic rotor which is disposed in the mandrel. The process is used in particular for producing blanks intended for the production of non-welded pipes and tubes.

The process and the device according to the invention relate to the continuous casting of hollow bodies made of metals such as aluminum, copper, steels of all types or other metals or alloys. The process involves introducing the liquid metal into an annular space between an external mold and an internal mandrel, the liquid metal being subjected in the vicinity of the mandrel to the action of a moving magnetic field which drives it upward. This field is created by a magnetic rotor housed in the mandrel comprising a rotating part around which is arranged at least one spiral made of magnetized magnetic material made integral with the rotor by at least one collar. The process is applied, in particular, to the production of blanks intended for the manufacture of seamless tubes.

Growing community of inventors

Gieres, France

Roland Ernst