A system and method for heat treating a tubular. In one embodiment, a system for heat treating a tubular includes a first coil and a second coil. The first coil is configured to circumferentially surround the tubular and induce, from without the tubular, current flow in a cylindrical portion of the tubular adjacent the first coil. The second coil is configured to be inserted into a bore of the tubular and induce, from within the tubular, in conjunction with the first coil, current flow in the cylindrical portion of the tubular.

A system and method for heat treating a tubular. In one embodiment, a system for heat treating a tubular includes a first coil and a second coil. The first coil is configured to circumferentially surround the tubular and induce, from without the tubular, current flow in a cylindrical portion of the tubular adjacent the first coil. The second coil is configured to be inserted into a bore of the tubular and induce, from within the tubular, in conjunction with the first coil, current flow in the cylindrical portion of the tubular.

Disclosed is an apparatus for heating smokable material to volatilize at least one component of the smokable material. The apparatus includes a heating zone for receiving at least a portion of an article including smokable material; an outlet for permitting volatilized components of the smokable material to pass from the heating zone towards an exterior of the apparatus when the article is heated in the heating zone in use; a heating element that is heatable by penetration with a varying magnetic field to heat the heating zone, wherein a first section of the heating element is located between a second section of the heating element and the outlet, and wherein the second section of the heating element is heatable in use by thermal conduction from the first section of the heating element; and a magnetic field generator for generating a varying magnetic field that penetrates the first section of the heating element and avoids the second section of the heating element.

The invention relates to a method and a heating device (1c) for inductively heating a stator (2) or armature (3) of an electric machine, in particular before and during trickle impregnation thereof. In addition, the invention relates to an impregnating device (50) in which this heating device (1c) is integrated. According to the invention, it is provided that the heating takes place inductively by means of electromagnetic fields of different frequencies. For this purpose, it is provided in the case of the heating device (1c) that it has at least one electromagnetic inductor (18, 21, 24) which is disposed coaxially or axially parallel with respect to the longitudinal axis (7) of the stator (2) or armature (3) and which inductively heats said stator or armature, and that the at least one inductor (18, 21, 24) is designed to generate at least two electromagnetic fields of different frequencies.

The invention relates to a method and a heating device (1c) for inductively heating a stator (2) or armature (3) of an electric machine, in particular before and during trickle impregnation thereof. In addition, the invention relates to an impregnating device (50) in which this heating device (1c) is integrated. According to the invention, it is provided that the heating takes place inductively by means of electromagnetic fields of different frequencies. For this purpose, it is provided in the case of the heating device (1c) that it has at least one electromagnetic inductor (18, 21, 24) which is disposed coaxially or axially parallel with respect to the longitudinal axis (7) of the stator (2) or armature (3) and which inductively heats said stator or armature, and that the at least one inductor (18, 21, 24) is designed to generate at least two electromagnetic fields of different frequencies.

An induction heating system for molding a thermoplastic article includes a first mold and a second mold defining a mold cavity therebetween for molding the thermoplastic article, a first metallic susceptor as part of or adjacent to the first mold, a first armature-supported induction coil array in proximity to the first metallic susceptor, and a first induction generator electrically coupled with the first armature-supported induction coil array.

An induction heater is proposed for melting paraffin deposits formed in borehole columns filled with borehole liquid. The heater includes an inductor joined essentially with a control module enclosing electronic components. The inductor includes a non-metallic protective cover enclosing particularly an induction coil heating up a heating rod with a tip that melts paraffin deposits. The protective cover provides free propagation of HF-magnetic field created by the coil, which also heats up the column's walls melting paraffin thereon. An internal cavity is formed particularly by surfaces of the protective cover, tip, induction coil, etc., and communicates with an elastic compensator. The cavity is filled with liquid filler allowing the inductor to withstand high pressure of the borehole liquid. Surplus of the filler formed in the cavity due to volumetric temperature expansion flows essentially into the compensator. Embodiments envisage regulating the heater's temperature, and operating the inductor at a resonance frequency.

An induction heater is proposed for melting paraffin deposits formed in borehole columns filled with borehole liquid. The heater includes an inductor joined essentially with a control module enclosing electronic components. The inductor includes a non-metallic protective cover enclosing particularly an induction coil heating up a heating rod with a tip that melts paraffin deposits. The protective cover provides free propagation of HF-magnetic field created by the coil, which also heats up the column's walls melting paraffin thereon. An internal cavity is formed particularly by surfaces of the protective cover, tip, induction coil, etc., and communicates with an elastic compensator. The cavity is filled with liquid filler allowing the inductor to withstand high pressure of the borehole liquid. Surplus of the filler formed in the cavity due to volumetric temperature expansion flows essentially into the compensator. Embodiments envisage regulating the heater's temperature, and operating the inductor at a resonance frequency.

An induction coil assembly includes an annular member extending from a first end to a second end, and extending about a longitudinal axis; a first leg extending from the first end of the annular member, and including a first electrical connection portion and a first axial portion; and a second leg extending from the second end of the annular member, and including a second electrical connection portion and a second axial portion. An internal surface of the annular member defines a first fluid passage through the annular member. An internal surface of the first leg defines a second fluid passage through the first leg. An internal surface of the second leg defines a third fluid passage through the second leg. The second fluid passage is in fluid communication with the third fluid passage via the first fluid passage.

A heating coil is configured to inductively heat an inner surface of a tubular workpiece. The heating coil includes a head portion configured to be inserted into the workpiece and to inductively heat the inner surface of the workpiece, and a pair of lead portions connected to one end of the head portion and the other end of the head portion respectively. The head portion and the lead portions are configured as pipe members forming a series of flow channels through which coolant flows. A cross-sectional area of the flow channel inside each of the lead portion is greater than a cross-sectional area of the flow channel inside the head portion.