General Electric Company

The United States of America As Represented by the United States

Peter G Frischmann

Alan I Taub

Howard H Liebermann

George M Rosenberry, Jr

Bernard Patrick Bewlay

William D Barber

Russell E Tompkins

Fred E Luborsky

Harvey E Cline

Mark Gilbert Benz

William Thomas Carter

Bruce Alan Knudsen

Robert John Zabala

Minyoung Lee

Ronald Dean Watkins

Steven A Miller

Bulent Aksel

Neil A Johnson

Dennis Joseph Dalpe

Donald E Ballard

Lee Cranford Perocchi

Francis X Gigliotti, Jr

Thomas E Douglas

An imaging system including at least one pole piece is described. The at least one pole piece includes at least two grain-oriented sheets that are stacked together, where a direction of easy magnetization of a first of the at least two grain-oriented sheets is different than a direction of easy magnetization of a second of the at least two grain-oriented sheets.

Systems and methods for fabricating pole pieces for magnetic resonance imaging systems

A system and method for repairing turbine components. The system includes means for obtaining a rapidly solidified material having a means of forming a rapidly solidified repair material and a means for melting the rapidly solidified repair material at a repair site located in a region of the turbine component. The means for obtaining the rapidly solidified material include melt spinning, planar flow, and melt extraction systems. Means for melting the rapidly solidified repair material include a welding torch, an electron beam, a laser beam, a welding torch, a TIG welder, and a plasma torch. A method for using the repair system includes the steps of providing a molten repair material, contacting the molten repair material with a rotating drum, thereby rapidly solidifying the repair material, melting the rapidly solidified repair material and portion of the turbine component at a repair site, and resolidifying the molten repair material and turbine component portion, thereby repairing a defect located at the repair site.

Turbine component repair system and method of using thereof

An MRI system includes a magnet which produces the main polarizing magnetic field. Variations in strength of this field are corrected by a temperature compensation system that calculates a compensating flux needed to maintain the field at constant strength. The compensating flux is calculated from changes in sensed magnet temperature and a magnet temperature coefficient. One or more correction coils are wound around the magnet and driven with the current necessary to produce the compensating flux.

Temperature compensated NMR magnet and method of operation therefor

A cold hearth for an electroslag refining crucible includes a floor above which a melt pools. The floor includes a drain for draining the melt by gravity. A plug is deployed inside the drain to block discharge of the melt therethrough, and an actuator is attached to the plug for withdrawing the plug from the drain to permit drainage of the melt upon startup.

Electroslag refining hearth

The method and apparatus of this invention is related to measuring a flow rate of a liquid having a density .rho. from a vessel having an inner cavity and a pouring channel. A flow sensor introduces a first gas flow into the liquid in the cavity at a first position, the inner cavity having a cross-sectional area A.sub.1 at the first position, and a second gas flow into the liquid in the pouring channel at a second position, the pouring channel having a cross-sectional area A.sub.2 at the second position, there being a vertical distance z between the first and second positions. A transducer provides an output signal proportional to a pressure differential p.sub.1 -p.sub.2 between the first and second gas flows. A processor receives the output signal and determines the liquid flow rate m through the pouring channel according to the proportional relation ##EQU1## where g is gravity.

Apparatus and method for measuring the mass flow rate of liquid from a

A powder filling apparatus comprised of a frame means having a cylindrical channel extending therethrough. A cylindrical funnel means is rotatably mounted in the channel, the funnel means having a bore extending therethrough. The bore has an axial section for receiving a flow of powder and an angled section at a preselected angle from the axis for directing the powder flow from the funnel means. A drive means is operatively connected for rotating the funnel means.

Powder filling apparatus

A method and apparatus for severing a stack of amorphous alloy ribbons in a softened state is disclosed. The method provides a smooth burr-free edge of close dimensional tolerance while preserving the desirable magnetic properties of the alloy. Resistance self-heating is applied to heat a localized portion of the stack to a temperature above the softening temperature of the alloy. Severing occurs adjacent the electrodes in an adjacent stack portion which is heated by diffusion from the directly heated stock portion.

Hot shear cutting of amorphous alloy ribbon

A method and apparatus for parting a deck of amorphous alloy ribbons in one operation is disclosed. Force is applied to a deck of ribbons to place it under tension. A localized zone in the deck is compressed and rapidly heated to the softening temperature of the amorphous alloy. The deck separates along a seam within the zone due to the tensile force and localized rapid heating. A high quality edge is produced where the separated ribbon edges are free of burrs, meltbeads or substantial cracking and chipping.

Method and apparatus for parting a deck of amorphous alloy ribbons

The problem of working an amorphous alloy is overcome by heating the alloy at a rate of temperature increase above about 1000.degree. C. per minute. The amorphous alloy is worked by homogeneous deformation after its temperature has been very rapidly increased to above the softening temperature of the alloy. Desirable magnetic properties of the alloy are preserved by working the alloy in this fashion and also tool life is extended.

Isothermal hold method of hot working of amorphous alloys

A bundle of articles having at least one small dimension are cut in succession. Tension is developed on the top article of the bundle. Heat is applied rapidly to a seam of the top article to be cut. The separated parts of a top article are withdrawn from the path of the beam and the next article is exposed to the heat.

Heat assisted parting of amorphous alloys

A method of melt extraction of titanium alloys is provided. The alloys are those containing a high concentration of titanium and a significant amount of an alloying element selected from the group consisting of molybdenum, tantalum and columbium. Surprisingly, the extraction process is rendered feasible when the surface of the extracting mechanism is of molybdenum.

Method for rapid solidification of titanium alloys by melt extraction

The problem of working an amorphous alloy is overcome by heating the alloy at a rate of temperature increase above a certain rate. The amorphous alloy is worked as its temperature is still being increased. Desirable magnetic properties of the alloy are preserved by working the alloy in this fashion and also tool life is extended.

Hot working of amorphous alloys

A method of severing an article subject to hot short phenomena is taught. A seam of the article is heated to bring it to the hot short condition and to have the remainder of the article at a temperature outside of the hot short range. A force is then applied to the seam to cause the article to sever due to brittleness of the material of the seam.

Stress assisted cutting of high temperature embrittled materials

Thermal compensators comprising at least one metallic alloy in amorphous form which are especially useful in stabilizing magnetic devices under conditions of changing ambient operating temperature are provided.

Thermal compensators for magnetic circuits

Metallic ribbon having cutout patterns therein is provided in continuous helical form. The cutout patterns may be situated to intersect either or both of the ribbon edges or may be situated entirely within the ribbon. The helical ribbon with the cutout patterns may additionally have a nesting, or self-stacking, feature.

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Scotia, NY, United States of America

Peter G Frischmann