Abstract: The disclosed spot welding robot controlling method and apparatus is able to carry out an operation for pressurizing a spot welding gun without a dead time of a spot welding robot which has the spot welding gun driven by a fluid pressure. The control method includes the steps of measuring a gun closing time, measuring an axial coincidence time, calculating a time difference between the time point of the command position axial coincidence and the output time point of the pressurization command in an actual welding operation using the gun closing time and the axial coincidence time, and outputting the pressurization command to the spot welding gun at a time point which is derived by subtracting the time difference from the time point of the command position axial coincidence in the actual welding operation.

Abstract: The invention relates, on the one hand, to an electric-arc work process, such as a plasma cutting or TIG welding process, in which a torch is supplied with at least one non-oxidizing gas, the said torch being provided with at least one electrode made of pure or alloyed metal, such as a tungsten electrode, characterized in that the said non-oxidizing gas contains a concentration of impurities of the oxygen type [O.sub.2 ] of less than 80 ppmv and a concentration of impurities of the water vapor type [H.sub.2 O] of less than 400 ppmv and, on the other hand, to such a welding gas.

Abstract: An apparatus for selecting a consumable welding wire from a plurality of consumable welding wires. The apparatus has a base, and a drive wheel rotatably supported by the base for engaging a consumable welding wire. A plurality of pinch-roller arms is pivotally secured to the base, and a plurality of pinch rollers is rotatably secured to the plurality of pinch-roller arms. The apparatus also includes a plurality of spring assemblies supported by the base for biasing the plurality of pinch-roller arms. A plurality of pneumatic cylinder assemblies engage the base and the pinch-roller arms for moving the pinch-roller arms relative to the base. A method for selecting any one of a plurality of consumable welding wires comprising pivoting a pinch-roller assembly to cause a rotatable pinch roller to engage and hold a consumable welding wire in driving engagement with a rotatable drive wheel.

Abstract: A welding cable designed to work with a welding system that does not have a pull-type torch is disclosed. The cable includes an electrode lead and an arc voltage sense lead. An insulating jacket is disposed about the electrode lead. The arc voltage sense lead is physically attached to the insulating jacket, along at least a substantial portion of the insulating jacket. The torch lead is preferably fixedly attached to the torch. The sense lead is connected to a controller. The sense lead may be disposed inside or attached outside the insulating jacket. The arc voltage sense lead may be attached to the electrode lead, rather than the torch itself.

Abstract: A resistance welding system with a self-contained close-loop cooling arrangement which includes a chiller, a welding transformer, a cable and a welding gun. The chiller has a feed-port and return-port for the cooling fluid. The welding transformer has an inlet and outlet for a defined cooling path and the inlet is coupled with the feed port of the chiller while the outlet is coupled with the return port of the chiller. One end of the cable is connected to one side of the transformer, for carrying the welding current. The cable is capable of being coupled to the chiller in a manner to internally transfer the cooling fluid in either direction. The welding gun is connected to the other end of the cable and has a pair of electrodes for applying the current through a pair of workpieces. The welding gun also has a built-in cooling system which is capable of receiving, circulating and returning the cooling fluid to the chiller without external fittings and hoses.

Abstract: In resistance forge welding, the heat for the welding point is produced by simultaneous action of an electrical current and the force of the electrode as well as the electrical resistance of the materials to be welded in the region of the point of contact of the electrodes. The workpieces generally lie flat on each other and are welded under considerable pressure at individual points by the force of the electrode. The current and the electrode force are supplied via the electrodes.In order to increase the controllability and dynamics of the electrode movement, according to the invention a controllable electromotive drive (13), which has a drive spindle (16) or a toothed rack, is used.

Abstract: A method for producing an electrical bond between a contact element of an electrical connector and a conductor, the contact element having a portion that is bifurcated such that the conductor is positioned between the furcations, the method comprising the steps of (a) providing a system comprising a power source and a weld head, the weld head having a first input and a second input for connection to a first polarity output and a second polarity output, respectively, of the power source, the system further including first and second electrodes movably attached to the weld head and electrically connected to the first and second inputs, respectively, (b) positioning the electrodes on the weld head to create a space between the electrodes that is sized for receiving both furcations of each contact element, (c) moving the weld head toward the furcations to effect contact between the first electrode and one of the furcations and between the second electrode and the other furcation, the contact being made at a prede

Abstract: A device for internally butt-welding pipes, of the type comprising a support and guide frame (2) for an annular welding member (3), rotatable coaxially to the pipes (1) to be welded and carrying a plurality of welding units (4) each comprising support means (13, 14; 40, 41; 40A, 41A; 45, 46) for a spool (8, 8A, 8B) on which welding wire (7) is wound, and means (26) for automatically feeding said wire. The support means (13, 14; 40 41; 40A; 41A; 45, 46) are removably connected to walls (10A, B) of a support frame (10) for the welding units (4) so as to enable said means to be replaced and spools of different type to be used.

Abstract: A portable welding ventilation system for extracting harmful welding fumes away from a welder without requiring the welder to wear an uncomfortable respirator. The inventive device includes a seat having a plurality of air nozzles, an exhaust fan, and a pair of side members removably attachable between the seat and the exhaust fan. The air nozzles within the seat release pressurized air toward the welding area thereby pushing the welding fumes away from the welder. The welding fumes are thereafter drawn into an intake manifold of the exhaust fan and then released a safe distance away from the welder through an exhaust tube. Flange about the intake manifold reduces the amount of fresh air drawn into the intake manifold.

Abstract: A self-contained, portable and fully integrated welder/generator and compressor unit including a housing sized to fit in the back of a pick-up truck, and an engine, an alternator and an air compressor arranged in alignment with one another within the housing. The engine drives the alternator directly, and a pulley arrangement is provided between a take-off shaft of the alternator to drive the compressor. The components within the housing are arranged to provide a storage space for welding tools, nail guns and the like and the like within the housing.

Abstract: The present invention provides an apparatus for loosening an electrode tip. The apparatus includes a clamping means mounted to a casing for clamping the electrode tip, the clamping means defining a through-hole for receiving the electrode tip to be loosened, and a driving means for driving the clamping means to allow the through-hole to expand and contract, thereby timely clamping and loosening the electrode tip positioned within the through-hole.

Abstract: An apparatus for producing magnetically-permeable cores for use in electromechanical machines, such as electric motors. The apparatus includes a plurality of welding arbors adapted to support a stack of core laminations. A storage structure defines a plurality of arbor storage locations at which respective welding arbors are maintained. A transporter device is operative to individually move the welding arbors to and from a respective arbor storage location. A welding device is operative to weld the stack of core laminations together. A conveyor assembly is also provided for moving the welding arbors between the welding device and the transporter device.

Abstract: In high frequency welding apparatus in which high frequency electrical heating current is supplied to metal surfaces to be welded together by contacts engaging the metal which is advanced toward a weld point, the contacts engage the metal in advance of the weld point and have contact faces with downstream edges contacting the metal. The downstream edge of one of the contacts, or the downstream edges of the both of the contacts, is or are skewed with respect to the path or paths of the metal surfaces to be heated so that the downstream edge or edges extend at an acute angle of about 35.degree. to about 55 .degree. with respect to the path or paths of the metal surface or surfaces, the angle being intermediate the contacts and the weld point.

Abstract: A method for applying a material to the face 16,18 of a rotor blade 10 is disclosed. The method includes blocking the flow of molten material to adjacent structure of a rotor blade by disposing a pad against the structure.

Abstract: An apparatus for repairing high temperature process vessels while at or near their operating temperatures, which may be up to 3000.degree. F. The apparatus includes a lance, a welding apparatus at the distal end of the lance, and power supply and control cabling within the lance. The welding apparatus is contained within a protective housing and both the lance and the housing may be either air- or water-cooled.

Abstract: A core for use in a die casting process has a wood fiber material as a main ingredient. The core can be disintegrated by exerting an external force subsequent to the die casting process. The core can also be disintegrated by applying a softening agent to soften it subsequent to the die casting process. Further, the core can be made up of a stack of paper layers that are peelably removable from each other.

Abstract: A mig welding gun has a handle with a longitudinal centerline and a hole with an axis transverse to the centerline. A trigger is received in the handle for rotation about an axis perpendicular to and offset from the hole axis. A spring biases the trigger to a released position whereat the gun is off. Applying a squeeze force to the trigger rotates it to a depressed position whereat the gun is on. A pin is slidable in the trigger to engage the handle hole when the trigger is in the depressed position. Removing the squeeze force while the pin engages the handle hole locks the trigger in the depressed position. Momentarily reapplying the squeeze force to the trigger causes the pin to disengage from the handle hole and enable the trigger to return to the released position. In a modified embodiment, the pin is engageable with a chap inside the hole.

Abstract: A method for die casting an amorphous metal or alloy using high vacuum die casting machine and die casting parameters effective to produce three dimensional net shape die cast components that retain at least 50 volume % or more amorphous phase in the die cast microstructure. The die cavity is evacuated to a vacuum level of less than 1000 microns through the shot sleeve, a superheated molten amorphous zirconium-copper-nickel-berylium alloy is introduced into the shot sleeve, the plunger is advanced at speeds in the range of 5 inches/second to 500 inches/second to force the molten metal or alloy into a sealed, evacuated die cavity where at least the outer surface or shell of the die cast component can solidify before opening of the dies to break the vacuum seal(s) and expose the cast component to ambient air atmosphere. The die component is removed from the opended dies and quenched in a quenchant medium, such as water, to produce a die cast microstructure including at least 50 volume % amorphous phase.

Abstract: A welding system for real-time weld quality detection during resistance welding of a workpiece has a sensor assembly including a winding and a core mounted generally coaxially within the cylinder of the welding gun. A piston and piston rod assembly are mounted for coaxial movement within the cylinder. The piston rod has an end protruding from the cylinder for affixing an electrode thereto. Axial movement of the piston rod relative to the cylinder causes axial movement of the core relative to the winding to vary a length of core and winding overlap. The sensor assembly produces an output signal based on the length of core and winding overlap to indicate piston rod position relative to the cylinder. Weld control logic receiving the sensor assembly output controls welding of the workpiece in real-time.

Abstract: The present invention aims to provide a method of regenerating foundry sand whereby the carbon component adhering to the surface of spent foundry sand and similar substances is combusted efficiently, allowing the foundry sand to be regenerated at low cost. In the present invention, in order to achieve this aim the spent foundry sand with the carbon component adhering to it is placed in a combustion furnace which is connected on one side to a pressure-reducing pump and is open on the other, the pressure-reducing pump is operated to draw air from within the foundry sand and introduce air into it, and the accretion is ignited upwind of the current of air which is being introduced, allowing combustion of the accretion to proceed successively on the downwind side. Foundry sand can thus be recycled at very low cost, simply and reliably because it is allowed to self-combust continuously without any heating or agitation from elsewhere, and because the resin is combusted entirely.