Abstract: Method for slag chemistry control in a refractory lined vessel during the process of refining metal by the injection of oxygen gas during a period of oxidation and by the injection of nonoxidizing gas or gases during a period of reduction and melt specification adjustment such that the slag at the completion of the refining process will have a preselected composition consisting essentially of A% alumina (Al.sub.2 O.sub.3), B% silica (SiO.sub.2), C% CaO and D% MgO and a ratio X of alumina to silica equal to a preselected value of between about 0.1 to 10. The preselected slag chemistry at the completion of refining is achieved by using a combination of aluminum and silicon to achieve as completely as possible the preselected ratio of alumina to silica in the slag while at the same time satisfying the fuel, reduction, and specification silicon requirements of the bath at the given intervals corresponding to the end of the oxidizing period, the reducing period and the final trim.

Abstract: A gas shielded arc torch for welding or cutting having a torch head surrounding a collet assembly including a collet body and a slotted collet for gripping and positioning an electrode within the torch head and a torch cap for locking the collet within the collet body. The torch cap has a taper for engaging the unslotted end of the collet and the collet body has a taper for engaging the slotted end of the collet. The taper in the torch cap is substantially larger than the taper in the collet body.

Abstract: A gas shielded plasma arc torch and collet assembly having a collet for receiving and gripping an electrode wherein the collet has spherical front and rear surfaces for engagement of and rotation in seats within the torch and a means for locking the position of the collet thereby locking and fixing the position of the electrode with respect to the torch.

Abstract: A diaphragm type gas pressure reducing regulator and adapter in combination in which the adapter serves to isolate the diaphragm from the valve seat in the regulator in response to a spontaneous ignition. The adapter comprises a plunger which intercouples the valve and the diaphragm assembly during normal operation of the regulator and isolates the diaphragm assembly from the valve in response to a spontaneous ignition within the regulator body upstream of the diaphragm assembly.

Abstract: The data analysis and display system of the present invention utilizes a microcomputer in combination with a CRT and a multiplicity of transducers for monitoring process parameters in the operation of a reciprocating device having a linear stroke. A profile of the process parameters are generated as a function of stroke length, stored in a non-volatile memory and graphically displayed on the CRT as master traces for comparison with current data profiles.

Abstract: A container for shipping transportable materials at cryogenic temperatures including a vessel which opens to the atmosphere and contains a micro-fibrous structure for holding a liquefied gas such as liquid nitrogen in adsorption and capillary suspension. The micro-fibrous structure comprises a core permeable to liquid and gaseous nitrogen and an adsorption matrix composed of randomly oriented inorganic fibers surrounding the core as a homogeneous body in stable confinement.

Abstract: The dental jacket crown of the present invention is prepared from a thin metal foil substrate which is coated with a noble based metal composition having a low fusing temperature and folded in a predetermined manner to form multiple folds in the form of triangular like flaps or pleats. The folded foil represents the coping of the present invention. The coping is mounted over a die of the prepared tooth and the flaps wrapped in overlapping formation and then adapted to the die. The die is removed and the structure heated preferably under a bunsen burner. A bonding material may be coated over the free standing structure if desired. A veneering material such as porcelain is then coated over the structure to form the crown.

Abstract: The pressure reducing regulator of the present invention is designed for oxygen service to prevent oxygen burn through. The regulator includes a diaphragm assembly which uses a metallic shield to protect the diaphragm from hot gases or combustibles issuing from valve chamber upstream of the diaphragm chamber.

Abstract: A storage container for shipping transportable materials at cryogenic temperatures including a vessel which opens to the atmosphere and contains a micro-fibrous structure for holding a liquified gas such as liquid nitrogen in adsorption and capillary suspension. The micro-fibrous structure comprises a core permeable to liquid and gaseous nitrogen and an adsorption matrix composed of a web of inorganic fibers surrounding the core in a multi-layered arrangement.

Abstract: A combination cutting torch and nozzle assembly for post-mix oxy-fuel gas cutting using two separate annular steams of preheat oxygen gas surrounding the fuel gas stream with the inner annular oxygen stream directed to impinge the fuel gas stream very close to the point of discharge from the nozzle assembly. The nozzle assembly is secured to the torch head of the cutting torch by a hollow retaining nut which forms an annular gap with the nozzle assembly for discharging the outer preheat oxygen gas stream.

Abstract: A gas pressure reducing regulator having a valve assembly with a slidable valve member containing a valve seat disposed within a valve chamber communicating with the inlet opening connection to a source of high inlet pressure through serially connected passageways having intersecting axes with an included angle of less than ninety degrees. The valve assembly also has a frustoconical tapered head juxtaposed relative to the valve seat such that upon loss of valve seat material the nozzle nestles into the seat to close off the valve.

Abstract: A method and control circuit for terminating a consumable electrode electric arc welding operation which comprises monitoring the welding parameters of the wire drive motor speed and the arc working voltage, comparing the monitored levels with a multiple number of present combinations of both arc working voltage and motor speed with at least one preset combination defining a high arc working voltage representing a long arc condition and with the last preset combination including a motor speed of relatively close to zero; evaluating each preset combination in tandum to determine if the conditions of a preset combination are satisfied and interrupting the power supplied to the arc in response to the satisfied combination of preset conditions.

Abstract: A method for controlling selected switching between preset welding schedules in a MIG welding operation, in response to operation from a single control switch having only on and off signal selections.

Abstract: A double walled nonpressurized cryogenic storage container having an elongated neck tube in combination with a closure assembly for the neck tube. The closure assembly includes a neck plug and a neck tube adapter having access means for sensor and fill lines. The neck tube adapter has an outer shell and an inner shell with a multiplicity of radially projecting spacer elements for establishing an annular space between the outer shell and the neck tube. The inner shell is preferably eccentric to the outer shell.

Abstract: The cryogenic reciprocating pump includes a pump body having a cylindrical pumping chamber extending from the forward end of the pump body to the pump body rearward end. A piston is reciprocated in the pumping chamber under the control of a piston rod extending from the pumping chamber. A packing assembly surrounds the piston rod and is coupled through an intermediate section to the rearward end of the pump body. The intermediate section comprises a tubular shell of low thermal conductivity material and a corrugated metal expansion member. The packing assembly is affixed to a support member connected to the pump body at the forward end thereof.

Abstract: The cryogenic pump is of the reciprocating type using a differential diameter piston assembly having a reciprocating piston and piston rod in which the piston is of a diameter larger than the piston rod so as to form a variable volume annulus within the pumping chamber about the piston rod. The pumping chamber is surrounded with a cooling jacket connected by a passageway to the variable volume annulus. Blow by fluid is collected in the variable volume annulus during each suction stroke of the reciprocating piston and passed into the cooling jacket during each discharge stroke so as to cause collected blow by liquid in the cooling jacket to flash during consecutive discharge strokes.

Abstract: A double-walled vacuum insulated cryogenic liquid container wherein the access conduit is composed of a material whose strength increases with decreasing temperature with the conduit having a wall thickness which varies in a manner such that when the container is holding a cryogenic liquid, the ratio of bending moment stress in the conduit due to a selected applied force to the strength of the conduit material is substantially constant along the length of the conduit.

Abstract: Scarfing apparatus for thermochemically treating a metal surface including a desurfacing head and an upper and lower block extending from the head in spaced apart relation to define a slot-like nozzle, output discharge means in at least one of the blocks for discharging a gas and a gas distribution assembly for distributing gas evenly across said output discharge means with the gas distribution assembly including an inlet supply chamber, a manifold discharge chamber which intersects the inlet supply chamber to form a ledge and a gas redistribution member supported upon said ledge for redirecting gas flow from said inlet supply chamber into said manifold discharge chamber.

Abstract: A window generation circuit is provided for gating image signals from an electronically scanned sensor array in a line tracing machine. The window generation circuit includes two shift registers of variable length for measuring intervals of time for setting first and second bounds to a sector scan. The interval of the second register corresponds to the width of the window. Logic circuitry, responsive to the detection of image data, alters the electrical lengths of the registers to enlarge the window in the absence of an image, and restores the original lengths upon return of the image.

Abstract: A system incorporating a photosensitive device and associated circuitry for scanning a line to be traced.