Abstract: Provided is an apparatus for coating a girth weld and a cutback region surrounding said girth weld, said apparatus having lateral travel at least equal to the length of the cutback region and circumferential rotational travel around the pipe. The apparatus can provide a multiple component coating accurately and safely, without the need for solvent flushing of the apparatus.

Abstract: A welding device which performs butt welding of tubes includes a table. The table supports a rotary member of a circular-arc shape to which a welding torch is mounted, and a gear train that rotates the rotary member around a center axis of the tubes. The welding device includes a first movement mechanism that moves the table in a first direction perpendicular to the center axis of the tubes, and a second movement mechanism that moves the first movement mechanism in a second direction perpendicular to the center axis of the tubes and the first direction.

Abstract: An automatic build-up welding machine for repair of workpieces such as track rollers. The machine requires no operator in charge during the welding operation. The apparatus comprises a device including a pair of guides, and a switch box connected adjustably in position to a welding torch, the switch box housing therein a pair of limit switches for reversing motion of the torch and a swing lever positioned between the limit switches. The apparatus controls the travel of the torch by varying half-cycles of the reciprocable travel thereof.

Abstract: Described herein is a slag removing apparatus suitable for use on a padi-welding machine, which permits automation of the pad-welding operation and which essentially includes: a C-shaped roller holder located beneath a movable welding torch and provided with a rotational drive mechanism for a roller to be padded; a pair of extension arms horizontally extended on the open side of the roller holder and fixed in vertically adjustable positions; a guide rail support member provided with a rack and bridged between the extension arms in parallel relation with the rotational axis of the roller drive mechanism and detachably at least at one end thereof; a carriage having on a rockable plate a drive motor and a pinion disengageably meshed with the rack and movable along the support member; an inclined mount plate provided on the carriage with a predetermined angle of inclination; and a vibrational beating mechanism holding at least one needle bundle with the fore end thereof in face-to-face relation with the welding s

Abstract: Apparatus for manipulating a welding torch independently along two axes. A torch support is provided to carry a welding torch or the like, and a motor is operatively coupled to position the torch support along a first path of travel relative to the weld joint. Another motor is operatively coupled to position the torch along a second path of travel orthogonal to the first path of travel.

Abstract: Welding methods and apparatus, wherein a welding electrode is oscillated by a motor-driven oscillator in back and forth movements transverse to a weld joint, and an alternating welding current is supplied to the welding electrode in timed relation with the welding tip oscillations so that weld metal is deposited along opposite sides of the weld joint in parallel paths without deposit of weld metal at the center of the weld joint.

Abstract: An apparatus for multi-bead welding of two rotating workpieces with a welding seam, which is deep relative to the maximum radius of the workpieces, includes a flat filler wire holder which can be inserted into the gap between the workpieces and which is periodically pivoted forth and back about an axis which at the beginning of the welding operation is located within the gap. The holder may be angled and comprise a first limb extending generally perpendicular to the axis of rotation of the workpieces and which holds the filler wire, and a second limb extending out of the gap in the direction of the pivot axis. A pipe for supplying welding powder or protective gas may be mounted on the holder parallel to the second limb thereof. At its inner end the pipe may carry a sensor which controls the outward movement of the holder during the welding operation.

Abstract: Apparatus for rapid and automatic welding of joints which interconnect sections of pipe, and in particular oil or gas transmission pipe. The system includes at least one torch transport assembly which simultaneously moves a plural number of welding torches along a path parallel to the pipe joint being welded. The torch transport assembly includes track segments which surround circumferential portions of the pipe joint, with a welding torch carrier and multiple torches being independently movable along each track segment. The torch transport assembly is mounted on a support apparatus which is rigidly clamped to the pipe sections during welding, and which permits the torch transport assembly to be rapidly positioned in rough alignment with a pipe joint. The torch transport assembly and selected operating parameters of each welding torch are adjusted to accurately position each torch with respect to the pipe joint, and to repeatably provide programmed welding parameters resulting in a uniform pipe joint weld.

Abstract: An apparatus for welding the adjoining ends of annular work members, such as lengths of pipe, employing an arc nozzle for melting and depositing metal in the gap between said adjoining ends. A drive motor coupled to the nozzle drives the nozzle laterally back and forth across the gap while the current that flows in said arc is integrated to generate a physical representation of magnitude of the integral. Means are provided to arrest the motor each time the magnitude reaches a predetermined threshold value, and to reverse the direction of travel of the motor.

Abstract: Signals which contain components that vary with the lateral position of an electric welding instrument as it travels along a weld path between opposite work pieces are obtained from the arc or other heat source and are first processed to remove confusing or nonsignificant components. The processed signals are then compared or combined with each other, or with other signals of predetermined value, to obtain outputs which can be used to determine or control the lateral position or movement of the welding instrument along the weld path. Specifically, in electric arc welding of metals, signals from an electrical characteristic at the arc, such as arc current, which include a component indicative of lateral position of the welding instrument with respect to one or more sidewalls, are first filtered and processed to remove undesirable components.

Abstract: The present invention relates to an apparatus suitable for use in the automatic welding of pipes. The apparatus according to the invention comprises a fixed part or rail band which is clamped around the pipe at a prefixed position and a moving part which is driven with an orbital motion along the rail band and supports a swinging welding torch, a welding rod feeding mechanism and a torch position adjusting mechanism. The swinging motion of the welding torch is produced by a pneumatic system which permits both the amplitude and the frequency of said swinging motion to be adjusted. It is also possible to produce high swing frequencies and various times of stoppage for the torch at the ends of the swinging motion.

Abstract: Welding apparatus in which a self-propelled wheeled carriage releasably supports a welding gun or torch of the hand-held type having a welding tip and control for controlling feed of a welding wire to the welding tip, wherein the carriage is guided along a joint to be welded at a predetermined proper welding speed, the welding gun being adjustably supported on a pivotally mounted cradle which is power-actuated to provide controlled oscillations of the welding gun and associated tip transversely of the joint at a rate of speed proportional to the propelled speed of the carriage, the amplitude of the oscillations being selectively adjustable between zero and a predetermined maximum. Interchangeable driving wheel units provide for use in the welding of planar disposed surfaces and angularly disposed surfaces.

Abstract: Disclosed is a welding head, for metallic arc inert gas (MIG) welding, which is to be moved by an external guidance system over a work surface. The head has an eccentric spindle, carrying the welding wire, which is rotated by its own electric motor to move the spindle in a circular or orbital path as the head is moved by the external guidance system over the work surface.