Abstract: Apparatus is provided for metallurgical heat treatment of coil springs, or similarly shaped workpieces and articles of manufacture, by electric resistance heating along the entire length of the workpiece so that the ends of the workpiece can be heat treated to the same degree and quality as the section of the workpiece between its two ends.

Abstract: A hand-held, water-cooled toroidal autotransformer assembly is formed from longitudinally-oriented electrically conductive radially spaced apart concentric pipes that are physically and electrically configured in series and arranged around a longitudinally-oriented toroidal magnetic core to form the windings of the autotransformer with the spaces between the longitudinally-oriented concentric pipes forming a flow path for a cooling fluid within the autotransformer.

Abstract: Discrete workpieces move through a longitudinally-oriented through-gap in an open-box rectangular ferromagnetic material. A transverse magnetic flux established in the through-gap inductively heats the discrete workpieces moving through the longitudinally-oriented through-gap. A longitudinal axis of the workpiece or the planar surface of a planarly-oriented workpiece is oriented either parallel to, or perpendicular to, the transverse magnetic flux to heat treat the workpiece.

Abstract: Apparatus is provided for metallurgical heat treatment of coil springs, or similarly shaped workpieces and articles of manufacture, by electric resistance heating along the entire length of the workpiece so that the ends of the workpiece can be heat treated to the same degree and quality as the section of the workpiece between its two ends.

Abstract: Apparatus and method are provided for preventing deformation along the longitudinal axis of a workpiece passing through a scan inductor when the workpiece has at least one section with a cross section larger than the cross section of the remainder of the workpiece. An upper and lower pair of opposing jaws transition between opened and closed positions as the workpiece passes through the scan inductor so that deformation is minimized as the workpiece passes through the scan induction apparatus.

Abstract: Discrete workpieces move through a longitudinally-oriented through-gap in an open-box rectangular ferromagnetic material. A transverse magnetic flux established in the through-gap inductively heats the discrete workpieces moving through the longitudinally-oriented through-gap. A longitudinal axis of the workpiece or the planar surface of a planarly-oriented workpiece is oriented either parallel to, or perpendicular to, the transverse magnetic flux to heat treat the workpiece.

Abstract: Apparatus and method are provided for an electric induction brazing process in an inert atmosphere using a substantially oxygen-free copper alloy filler or preform under an inert atmosphere within a brazing chamber minimally sized for containment of the brazed joint region and an induction coil. The inert atmosphere may be nitrogen gas supplied from a liquid nitrogen source. For brazing of an open-interior fitting around a hole in a tubular material a nesting area is provided around the hole for seating of the filler or preform and the fitting.

Abstract: Apparatus and method are provided for electric induction heat treatment of electrically conductive thin strip material. Multiple series-connected coil loops, each having a pole pair, are provided in each of a top and bottom induction coil, which are positioned mirror image to each other. The top and bottom induction coils form a transverse flux induction heat treatment apparatus. A separate flux concentrator is provided over and on the side of each pole. The thin strip material passes between the poles of the top and bottom induction coils and the flux concentrators associated with each of the poles.

Abstract: A braze joint is made between two workpieces by first forming a thermal shrink fit region between the two workpieces adjacent to, or around, a braze or filler region in which a filler metal is located adjacent to, or within. The filler metal is suitably heated so that it flows in the braze or filler region to form the braze joint of the two workpieces. Cutouts may be formed in the thermal shrink fit region adjacent to the braze or filler region to extend the braze joint region or provide paths for gas byproducts in the brazing process.

Abstract: Apparatus is provided for metallurgical heat treatment of coil springs, or similarly shaped workpieces and articles of manufacture, by electric resistance heating along the entire length of the workpiece so that the ends of the workpiece can be heat treated to the same degree and quality as the section of the workpiece between its two ends.

Abstract: Apparatus and method are provided for metallurgical heat treatment of coil springs, or similarly shaped workpieces and articles of manufacture, by electric resistance heating along the entire length of the workpiece so that the ends of the workpiece can be heat treated to the same degree and quality as the section of the workpiece between its two ends.

Abstract: Apparatus and method are provided for heat treatment of a tubular preform material that is loaded onto the outer surface of an electrically conductive mandrel forming a rotatable tubular shaped resistance heater.

Abstract: A multiphase communication system for simultaneously transmitting plural binary digits employs one or more error-check bits which perform an encoding on the conveyed information over a plurality of digit intervals. The information and error check digits are then communicated via a transmission channel--as by amplitude modulating phase-orthogonal carriers.Upon reception, the incoming information and error check digits are decoded, and supplied to error syndrome circuitry which corrects errors which may arise from time to time during data transmission.