Showing papers on "Welding published in 1969"

Arc welding gun

Abstract: A high current capacity arc welding gun for gas-shielded, continuous feed, consumable electrode arc welding processes. Features include: a unique handle cooled by convection air flow; an improved head assembly having a unique electrical insulating ion impervious shield for preventing destructive arcing to the gas nozzle, an improved shielding gas flow path through the head assembly which additionally cooperates with the ion impervious shield to prevent gas nozzle arcing, a unique current contact tip which attaches to the head assembly by a novel curved wedge clamping concept and which is produced by an improved, versatile, and inexpensive method of manufacture that increases the copper density and refines the grain structure in the current contact tip for greater life; an improved gooseneck lining for longer life and reduced friction; a heat protected control switch assembly of rugged construction and unique trigger operation; and an improved welding cable connection assembly.

Apparatus for welding heat sealable sheet material

Abstract: AN APPARATUS FOR WELDING HEAT SEALABLE SHEET MATERIAL WITH HEATED FLUID MOVING THROUGH A PLATEN HAVING A CHAMBER. THE CHAMBER IS CLOSED WITH A FLEXIBLE, NONELASTIC, THIN COVER HAVING A SURFACE AREA EXPOSED TO THE CHAMBER THAT IS LARGER THAN THE TRANSVERSE AREA OF THE CHAMBER, WHEREBY THE COVER IS MOVED BY THE PRESSURE OF THE FLUID IN THE CHAMBER WITHOUT ELONGATING OR DEFORMING THE COVER TO TRANSMIT FORCE AND HEAT TO A SURFACE OF THE SHEET MATERIAL. THE COVER IS URGED TOWARD THE SHEET MATERIAL BY THE HEATED FLUID UNDER PRESSURE WHICH TRANSMITS BOTH HEAT AND PRESSURE TO THE SHEET MATERIAL TO WELD THE MATERIAL. THE PLATEN MAY BE PROVIDED WITH FLUID IN A VAPOR PHASE TO PROVIDE THE PLATEN WITH TOTALLY UNIFORM PRESSURE ON THE COVER WHICH ADJUSTS TO THE IRREGULARITIES ON THE SURFACE OPPOSING THE COVER. THE VAPOR ALSO MAINTAINS, THROUGH CONDENSATION OF THE VAPOR, A UNIFORM SURFACE TEMPERATURE ON THE COVER. THE CONDENSED LIQUID IS RETURNED FROM THE CHAMBER BACK TO A VAPOR GENERATING SOURCE.

Method for the uniform extrusion coating of welding flux compositions

Abstract: A method and apparatus are provided for the uniform extrusion coating of flux mixtures on welding rod or wire, in which a sonic or ultrasonic wave vibration at a frequency from about 5,000 to about 400,000 c.p.s. is applied to the flux mixture to maintain its uniformity, and thereby prevent the obstruction to the smooth extrusion coating of the welding flux mixture as the flux mixture is fed under pressure to the extrusion nozzle.

Diffusion welding of the nickel-base superalloys

Abstract: 1,263,228. Welding by pressure. UNITED AIRCRAFT CORP. 6 April, 1970 [24 April, 1969], No. 16117/70. Heading B3R. [Also in Division C7] A process for diffusion welding components of nickel-base superalloys of the γ-γ 1 type having a combined Al/Ti content in excess of 6% by weight comprises coating each of the surfaces to be joined with a nickel-base coating containing up to 50% by weight cobalt to a thickness of 0A63-3A8 A, and diffusion bonding the components under pressure and at a temperature exceeding the γ 1 solvus temperature. The cobalt content is preferably between 25 and 35% by weight and the interlayer may be electroplated or applied by vacuum deposition on the surfaces to be joined. Specific alloy compositions referred to include the following:-

Plasma-generating method and means

Abstract: An inert gas welding torch is used to create plasma by directing one or more discrete high velocity jet gas streams into a welding arc between the electrode and the workpiece. The plasma stream is controllable with regard to energy content or location by varying the amount or direction of the inert gas flow. The plasma stream is insensitive to variations of arc length, and permits abnormally high current densities in the electrode. When used with consumable electrodes, the invention is useful for casting as well as for deep welding heavy plate materials in a single pass.

Plasma arc welding torch

Abstract: A plasma arc welding torch suitable for welding materials of construction. The torch is characterized in that the head is divided into two sections, each section carrying a different electrical potential, the sections separated by a combination electrical insulator and sealing member. The sealing expedient is effected by coating the opposite sides of the insulator with a metal layer and brazing each of the opposing layers to metal members associated with the two sections of the torch. There is further provided a collar for electrically insulating the torch tip from the nozzle and at the same time serving to aid in dissipating heat generated at the tip.

Internal pipe lineup clamp

Abstract: In internal pipe lineup clamp for properly aligning adjacent pipe sections prior to welding, is self powered for all of its operations. All components of the device are mounted in a body portion which includes a compressed air tank to supply the motive means for driving air motors which operate the various components including a pair of powered wheels which propel the device through pipe sections. The device includes a latch which assures proper location with regard to two adjacent pipe sections and two sets of similar radially extending members which come into proper alignment, each set adjacent one end of each pipe section ready to be powered by hydraulic means to be urged against the internal surface of the pipe sections and to form the adjacent pipe sections into a similar and uniform radius. Air motors supply the power for the hydraulic pumps. Sealing means are provided for the area of the pipe section adjacent to the radially extending members so that vacuum may be supplied to this area in order to draw molten welding metal into the space between the pipe section to insure better weld. Also described are means to supply welding flux to the edges of the pipe sections being welded from a position between the radially extending members. Means are also provided to control the amount of vacuum applied to the weld area in relation to the amount of weld area remaining open. Means are also provided to control the presentation of flux to the weld area in relation to the speed of welding.

Effect of the initial parameters on the process of wave formation in explosive welding

Abstract: A character is t ic feature of joints obtained by explosive welding is the rather s t r ict regularity and periodicity of the residual deformation in the impact region, which gives the contact surfaces a wavy shape (Fig. i). served that the waves formed when metal plates collide promote the formation of a strong joint [2, 3]. The positive effect of wave formation in connection with explosive welding is evidently attributable to the following principal factors. 1. During wave formation most of the initial kinetic energy of the projected plate is converted not into compressive energy, but into energy of plastic wave flow, with subsequent conversion into heat. This prevents the development of tensile s t resses during unloading, which might destroy the joint, and the metal in the joint zone is strongly heated, which in most cases favors the formation of a strong bond. 2. Wave formation is accompanied by the formation of a zone of interpenetration of the surface layers of the metals, in which both welded components are simultaneously present. The existence of this zone is attributable to purely mechanical processes associated with wave formation.

Control for reverse-polarity welding

Abstract: A reversing polarity arc-welding technique, wherein a welding current waveform has alternate ''''straight-polarity'''' portions and ''''reverse-polarity'''' portions; the reverse-polarity portion being desirable for its ionic cleaning, but being undesirable for its electron bombardment of the welding electrode. This disclosure teaches the advantages of reducing the welding current during the reverse-polarity interval; and discloses electronic circuitry for achieving this result.

Method and device for self-regulated welding in the manufacture of longitudinally welded metal tubes

Abstract: A method according to which the most important quantities in the manufacture of welded metal tubes, i.e. feeding speed of the metal band, upsetting pressure, intensity of the whole welding current, intensity of the so called back current, applied voltage and temperature of the welding seam, are continuously electrically measured and the measured values are correlated to each other obtaining a plurality of quotients which are compared with prefixed quotients corresponding to optimal welding conditions; the electrical value resulting from said comparison starts a self-regulating process of the concerned quantities in order to reach again said prefixed quotients.

Apparatus for welding thermoplastic sheet material

Abstract: APPARATUS FOR WELDING THERMOPLASTIC SHEET MATERIAL INCLUDING CONICAL SHAPED THERMOPLASTIC BUTTONS SPUN WELDED TO JOIN MATING EDGES OF TWO THERMOPLASTIC SHEETS AND A FRICTION DRIVER MOUNTABLE IN A HAND DRILL FOR SPINNING BUTTONS.

Wrought welding alloys

Abstract: A welding alloy and a method of making same containing a controlled amount of aluminum and calcium, for example, as represented by the formula A1 + 31.8 Ca < 3,500 where the compositions are given in parts per million for the elimination of fusion zone undercutting during the welding of said alloy.

Spatter and heat shield for welding gun

Abstract: A heat and spatter shield for an arc-welding gun of the type used for applying gas-shielded consumable-electrode arc-welding processes. A shield element insulated from the welding current circuit is attachable to the arc-welding gun so as to be disposed at the downstream end of the current contact tip and extend beyond the downstream opening of the gas nozzle so as to shield the downstream opening of the gas nozzle from metal spatter ejected from the welding operation and from direct heat radiation from the welding arc. At least the core of the shield element is composed of a heat-resistant nonelectrically conductive material. The shield element is disposed in the gas stream and arranged to provide an airfoil effect contributing to formation of the proper flow configuration of the shielding gas. Cylindrical and spherical-type shield elements are disclosed. Various means are disclosed for attaching the shield element to the arc-welding gun.

Method for manufacturing a turbine blade

Abstract: A method for manufacturing a turbine blade in which a sheet metal strip, corresponding in its dimensions to the developed blade, is provided with cooling passages, thereafter a thinner sheet metal strip is attached to the sheet metal strip provided with the grooves by welding or brazing to form a blade wall, and thereafter the blade wall is placed about a tool core and is deformed into the shape of the blade whereupon the ends of the strips are connected with each other by brazing or welding to form the trailing edge of the blade.

Method and apparatus for underwater arc welding

Abstract: According to the method of this invention water is kept away from the arc in underwater arc welding by means of a gas under a pressure greater than that of the water and, preferably, the wire-feeding unit, welding gun, and electrode wire of the gas shielded, metal arc-welding apparatus to be used under water are enclosed in airtight and watertight containers. The air connecting conduits and tubing carrying the electrode wire and shielding gas are similarly enclosed in airtight and watertight conduits. The containers and conduits are then internally pressurized with a shield gas to prevent the entry of water. The welding gun nozzle is enclosed within coaxially disposed tubular sections such that the electrode wire may be surrounded by either one or two annular gas streams under pressure which serve to shield it effectively from the surrounding water. Welding then takes place in a pocket of shielding gas to permit underwater welds of a quality previously obtainable only in atmospheric conditions.

Welding process preventing the bond brittleness of low-alloy steels

Abstract: This invention is to establish a new welding process for welding a high strength steel, low-temperature service steel or low-alloy steel by first depositing a high notch toughness metal on each root face of a joint, then welding the deposited high notch toughness metal layers and heat-treating the weld bond with the welding heat to prevent weld bond brittleness.

Strip shearing and welding apparatus

Abstract: The strip shearing apparatus includes a pair of longitudinally spaced stationary shear knives and a pair of movable shear knives carried by a pivotal support for pivotal movement between the stationary shear knives. A weld backup bar electrode may also be mounted on the pivotal support for movement into engagement with the underneath sides of the strip ends after shearing and indexing of the strip ends to the welding position to clamp the strip ends firmly in position for welding. During the welding operation, the movable shear knives on the pivotal support are desirably located above strip pass height to permit reshearing of the strips after joining if it becomes necessary to remove the weld. A pair of clamp assemblies indexable toward and away from each other between the strip shearing and welding positions continuously clamp the strips during the shearing and welding operation, and may be of generally C-shape to allow the entire apparatus to be removed from the strip processing line after the strip ends have been joined together if desired. The welding assembly may also be carried by one of the strip clamp assemblies for indexing movement therewith, and a pivotal mount may be provided for the welding assembly to protect it against damage by premature opening of the associated clamp assembly.

Underwater welding method

Abstract: The invention provides a method of welding heavy metal sections located deep under water without having to raise the sections to the surface. The method consists of lowering a chamber having an open bottom until it encloses the area to be worked upon. Preferably a pressurized gas is introduced into the chamber as it is being lowered in order to prevent the water from rising beyond a certain level which is maintained in a dry condition. After the chamber is set in place, a pressurized gas is introduced to displace the remaining water in the chamber. Thereafter the chamber atmosphere is preferably maintained in a substantially inert condition and the weld made with a nonconsumable electrodeinert gas-welding apparatus operating with a 1/64- to 1/4 -inch arc length at 85 to 250 amps and at a voltage sufficient to maintain a stable arc.

Fluxless high-frequency aluminum tube welding without inserts

Abstract: A method of fillerless butt welding hot crack sensitive aluminum tubing with high-frequency current pulsation with continuous pressure purging as a means of eliminating flux and improving weld bead contour.

Method and apparatus for control of resistance welding

Abstract: In spot welding, weld nugget growth is monitored by an arrangement including an hydraulically operated electrode, and a check valve to trap fluid in the hydraulic cylinder. Thermal expansion of the workpiece produces a force on the electrodes and a pressure rise in the hydraulic fluid. An electrical transducer senses the pressure rise and produces an electrical signal proportional to work expansion which operates a circuit for terminating welding current when the pressure rise ceases. For pneumatically driven electrodes, an auxiliary hydraulic locking cylinder provides the pressure signal.

Ultrasonic welding apparatus

Abstract: An ultrasonic welding apparatus and method appropriate for welding sheets of plastic including oriented polyesters such as polyethylene terephthalate film, including means for chilling the workpieces while they are being compressed by the ultrasonic tool

Sonic welding apparatus having universal aligning means

Abstract: This application discloses an apparatus and method for sonically welding a plurality of thermoplastic relatively flat members or plates. A sonic signal producing element or horn presses and imparts welding sonic signals to one of the flat members. A holding fixture holds one or more of such flat members. A base supports the holding fixture, and universal supporting joint means are provided between the holding fixture and the base. Such universal supporting joint means may include a relatively large spherical ball which is received in recesses in the holding fixture and in the base. This construction equally distributes the main part of the force of the horn over the entire surface of the parts to be welded together between the flat members or plates.

Ultrasonic welding and cutting apparatus

Abstract: An apparatus for the ultrasonic welding and cutting of a pair of juxtaposed synthetic-resin sheets has a sonotrode and an anvil, one being engageable with the other, upon their relative movement toward one another. Mounted on the anvil or sonotrode is a spacer element is the form of a ridge running along the middle of the welding face of the tool. This ridge has a height slightly less than the combined thickness of the two sheets so that when the spacer ridge engages the opposite welding face it cuts the sheets while the surfaces of the face blanking the spacer ridge coact with the opposite face to form a welded seam.

Copper-Nickel Alloys

Abstract: 1,157,223. Copper alloys. INTERNATIONAL NICKEL Ltd. Sept. 13, 1967 [Sept.21, 1966], No.41819/67. Heading C7A. An alloy consists, in percent by weight, of Cu and impurities - balance The following impurities are mentioned and should not exceed the amount stated:- The alloy possesses high yield strength when air-cooled from annealing, hot-working and welding temperatures, e.g. 900‹-1090‹C. Products which may be made from the alloy include piping for sea-water, heat exchangers, stills, condensers, and containers resistant to alkali corrosion.

Method of seam welding overlapping workpieces

Abstract: A continuous lap seam is welded at the extreme edge by passing it between a pair of roller electrode members each of which carries a continuous length of a wire electrode, the wire interengaging the rollers and having an outer work engaging surface which is substantially flat, thereby providing a welded seam entirely outwardly of the edge of at least one of the lapping portions.

Method of fabricating welded branched pipe connections from weldable thermoplastic materials

Abstract: There is disclosed a method of fabricating welded branched pipe connections from weldable thermoplastic materials, such as polyethylene, which includes shaping the end of a branch pipe section to the curvature of a main pipe section, simultaneously heating the shaped end of such branch pipe section and an annular zone of the main pipe section to a welding temperature, pressing the heated shaped end into the heated annular zone of the main pipe section to weld the sections and applying pressure to the material of the sections on both the inner and outer sides of the intersection between the branch pipe section and the main pipe section, while precluding spreading of the sections in a direction perpendicular to the direction in which the sections are pressed together so as to deform the material of the heated annular zone of the main pipe section upwardly into the material of the branch pipe section to increase the area of welding contact. There is also disclosed a press tool for use in such method, which includes outer and inner sleeve means spaced to accommodate a branch pipe section and such sleeves having shaped pressure applying end portions, operative to deform the crosssectional welding line of contact into a raised lip or hump to increase the area of welding contact.

Method and apparatus for welding heat sealable pipes

Abstract: T- and Y-joints are formed by welding the butt end of a first pipe of heat sealable material, such as polyethylene, to a continuous second pipe of heat sealable material, such as polyethylene, by aligning the axis of both pipes in a common plane, removing a shaped section of pipe wall from the continuous pipe and removing a portion of the butt end of the first pipe so as to form the butt end into a complementary shape to that of the removed shaped section of the continuous pipe, heating, preferably simultaneously, the shaped sections and pressing the pipes together to form a joint that will provide for fluid communication between the pipes.

Preheating and welding method

Abstract: A fusion welding method for steel exceeding 0.4 percent carbon content where all such steel in the article which is integral with the weld surfaces is heated above the upper transformation temperature resulting in a superior weld and a sound article absent localized areas of martensite and other detrimental characteristics. Preheating, simultaneous heating, and/or post heating is employed and when an article is preheated, surfaces to be welded are maintained relatively cold to minimize oxidation. Surfaces to be welded are freshly exposed immediately prior to welding and in an extremely rapid sequence of operations and when preheating is employed; surface exposure, preheating and welding steps are carried out in rapid sequence to minimize oxidation. Surfaces are provided with V-shaped configurations novel to resistance upset butt welding.

Variable parameter tungsten-inert gas welding

Abstract: There is disclosed herein a modified Tungsten-Inert Gas welding process for joining relatively thick high-strength steel plates by depositing multiple layers of weld metal in a groove between the plates. For each layer, the arc voltage, arc current and feed rate of filler material are adjusted to provide uniform heat input to the weld for varying size weld deposits. The weld layers formed from the successive passes extend along the length and across the width of the weld groove, and are of substantially uniform thickness. The top one or two weld layers may be side-byside weld deposits which extend along the length of the joint and overlap intermediate the width of the groove. The weld groove is V-shaped and wide enough at its top to permit clearance of the welding electrodes when depositing the lowermost layer.