Abstract: Disclosed is a molding tool for producing a composite part using induction heating. The molding tool has a mold with a contact surface adapted to be in contact with a material to be transformed into a composite part, and an outer surface. The mold is configured to be inductively heated by at least one main coil arranged in a meander-like pattern on the outer surface of the mold, such that a magnetic field generated by an alternating electric current flowing through the at least one main coil induces currents in at least parts of the mold to be heated, and at least one perimeter coil arranged on the outer surface of the mold configured to delimit at least one area of the mold to be inductively heated. The at least one main coil and the at least one perimeter coil comprise litz wires which are electrically insulated from the mold and in operative communication with at least one processing means.

Abstract: A system for controlled induction welding of at least one weld seam area (A) of at least two surfaces of at least one workpiece is provided. The system comprises an inductor configured to be arranged in conjunction with the at least one workpiece, a processing means configured to generate an electromagnetic field by applying an alternating voltage to the inductor so as to inductively heat at least one of the surfaces so that the weld seam area (A) is welded together, simultaneously measure at least one parameter (P) of the at least one workpiece at least based on the generated electromagnetic field, detect a change of the at least one parameter (P), and determine a temperature estimation of the at least one workpiece based on said detected change.

Abstract: An apparatus for controllable heating is provided comprising at least one coil system (110) with at least one coil unit (111) connected to a power source, where the coil unit (111) is arranged to create a magnetic field. The apparatus further comprises at least one electric current conductor (120) which is arranged at least partly around said coil unit (111), and at least one element (130) which is configured to be heated and which is connected to the electric current conductor (120) in such a way that the electric current conductor (120) and the element (130) form a closed conduit. The magnetic field of the coil unit (111) is arranged to induce a voltage in the electric current conductor (120) and the element (130), where the induced voltage creates an electric current in the closed conduit, and where the element (130) is configured to be heated by the electric current.