Showing papers on "Electric resistance 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.

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.

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.

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.

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.

Tab welded joint and method of making

Abstract: A welded joint comprising overlapped strips of metal with tabs formed by piercing or lancing through the overlapped portion. The formed tabs are flattened against the metal and resistance spot welded to such metal. The resistance welding forms a metallurgical bond between the metal members.

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.

Electrical resistance welding of coated sheet metals

Abstract: The invention provides a method for the electrical resistance welding of coated sheet metals, in which welding current is fed to at least one of the coated sheets indirectly through the metal layer thereof and contact is established between blank areas thereof to be welded to each other, wherein annular or elongated knife edges are provided at the welding area of the sheet metal to be welded on or on intermediate welding pieces, and cavities are produced by embossing and/or by milling, for preserving an outer coating undamaged by the heat of welding.

Dc can welder

Abstract: A method and apparatus for resistance lap welding a longitudinally extending seam on a metallic tubular element of relatively short (as for barrels, pails or cans) finite length utilizing a DC welding current and controlling same adjacent the leading and trailing edges to compensate for the change in current density thereat. The welded seam is then planished to render the weld joint smooth.

Electroslag welding nozzle and process

Abstract: An electroslag welding nozzle having a guide opening toward the middle and wing bars extending out at different sides, the nozzle being enrobed with an adhering coating of electroslag welding flux. In the electroslag welding process the nozzle is stationary and greatly increases the thickness of permissible vertical welds which can be made with a single electrode without horizontal oscillation.

Quality control in resistance welding

Abstract: In a resistance welding process, the rate of displacement of a movable electrode, due to expansion of the heated workpieces between the welding electrodes, is measured in a first part of a welding operation and the current flow is then continued after the said first part for a period which is a function of the result of the measurement.

Method for ultrasonically welding using a varying welding force

Abstract: An improvement in ultrasonic welding is effected by progressively increasing the welding force and then applying the ultrasonic energy so that a portion of the ultrasonic welding period occurs during the welding force range when optimum ultrasonic welding conditions exist; an ideal welding force, for this application being defined as the force applied to the parts to be joined by a welding tip or other means of applying ultrasonic energy, so that the faces to be welded are pressed together at the intended location of the weld.

Shielding gas pressure actuated pipe-welding device

Abstract: An internal pipe-welding device having a carriage, an internal pipe clamp, a rotating welding nozzle which is pivotally mounted and biased away from its welding position, a pressure responsive means connected to the welding nozzle and adapted to move the welding nozzle to welding position responsive to the supply of shielding gas through a single service lead supplying the welding potential, the motive power for feeding electrode and the shielding gas. The pivoting of the welding nozzle also pivots a contact button which makes contact to supply electricity for welding to the welding nozzle only when the nozzle is in welding position.

Arc-welding apparatus

Abstract: In short circuit transfer arc welding, from among the arc voltages generated during each arcing period, those portions irregularly generated are eliminated and, subsequently, only those voltages corresponding to the arcing time are detected and, further depending upon the detected voltage, the motor for feeding the welding electrode is driven so as to feed the welding electrode that an adequate speed so as to enable the welding work to provide a uniform and acceptable final weld through the entire welding operation.

Electron beam welding process and apparatus

Abstract: A tubular metal blank having two longitudinally opposed edges welded to form a seam by a process and apparatus therefor including heating the edges to a welding temperature at a first station and pressing the edges together at the first station to initially weld the edges thereof and provide extruded metal outwardly of the seam provided by the weld. Then the weld seam and extruded metal is electron beam welded at a second station with the initial weld being refined by the electron beam welding and undercutting in the weld being prevented by the formation of the extruded metal from the weld area. Additional metal may be added prior to the electron beam welding station to provide additional material at the weld seam to overcome the problem of undercutting.

Pipe-welding process

Abstract: This is an improved process of induction welding of steel pipe and an improved product of such process. After steel skelp is formed into a tubular blank with an open longitudinally extending seam, the seam edges are continually heated, converged and pressure-welded. Heat is applied to the converging edges in a novel manner to eliminate entrapment of harmful scale during welding, to prevent thermal stressing or cracking of the seam after welding, to arrest the growth of martensite and to produce a pipe product characterized by a substantially pure metal interface extending the width of the pipe wall.

Method of arc welding thick members by reciprocation of a welding wire electrode

Abstract: A method of welding thick members such as plates in the vertical direction. The gap between the plates is made small, and only the welding wire serving as the electrode is inserted in a generally horizontal direction into the gap. By appropriately controlling the speed of the wire feed means, the tip of the wire is made to transverse the gap as it is moved upwardly along the gap to deposit weld metal in the gap.

Method and apparatus for attaching insulation to duct work

Abstract: A resistance welding method for attaching insulating batts to metal duct work using a welding pin having a head of large crosssectional area and a shank having a turned, lathe sharpened tip. The head portion of the pin is contacted by an enlarged electrode defining a heat sink. The sharpened tip of the pin is advanced through the insulating batt into contact with the duct. Welding current is passed from the electrode through the shank and duct while the tip is continuously pressed against the duct. The sharpened tip is formed to an angle of 45* to 50*. The crosssectional area of the head is at least 20 times greater than that of the shank.

Forge welding by hi-frequency heating and metal deposition

Abstract: Metal workpieces that are to be joined by welding are brought to or near forge welding temperature by a first heating means such as a high frequency resistance heating means or a high frequency induction heating means. At the same time that the workpieces are being heated to their desired temperature by the first heating means or at a short interval of time thereafter, a stream of hot molten metal droplets from a metallizing type of gun means is directed to and impinges upon the metal workpieces and amount of molten metal of the workpieces in the weld area.

Method and apparatus for resistance welding utilizing application of high pressure

Abstract: A method and apparatus are disclosed herein for electrical resistance welding wherein a high pressure is applied by the welding electrodes to the overlapped portions of metallic blanks concurrently as a high current is supplied to the electrodes.

Device for moving chain links in a resistance welding machine

Abstract: A device is used for moving bent C-shaped links joined into a continuous chain to be welded in a resistance welding machine The device has an inlet guide and an outlet guide, consisting, for example, of guiding rails The device also has a saddle moving a link between tensioning tools and supporting it during the welding, as well as a transporting tool for the chain The device is particularly characterized by the arrangement whereby the saddle is movable relatively to the guides substantially perpendicularly to the direction of movement of the chain link

Interchangeable plural electrode guides for electric arc welding

Abstract: A device for the continuous mechanical welding of hollow bodies such as tubes includes a mounting means for one or more welding nozzles, and a plurality of welding wire feed nozzles which may be interchangeably engaged in the mounting means in a position such that they may feed the welding wire directly to the workpiece at a desired angular orientation. Each tubular feed nozzle is associated with a supply of welding wire from a reel supply and means are provided for feeding the welding wire to the associated nozzle. The wire feed nozzles can be used selectively as cold wire or as current nozzles depending on the welding method which is employed.

Welding tip cleaning device

Abstract: A DEVICE FOR CLEANING A WELDING TIP OF THE TYPE USED FOR GAS METAL ARC WELDING. THE DEVICE COMPRISES A TUBULAR SHAFT ADAPTED FOR MATING ENGAGEMENT ABOUT THE WELDING TIP GUIDE TUBE. A PAIR OF BLADE MEMBERS ARE DIAGONALLY OPPOSITELY DISPOSED ALONG THE EXTERIOR OF THE SHAFT, SUFFICIENTLY CLOSE THERETO TO PERMIT INSERTION THROUGH THE GAS NOZZLE OPENING OF THE WELDING TIP TO BE CLEANED. AN ACTUATOR MEANS SPREADS THE BLADES AWAY FROM THE SHAFT AND AGAINST THE INNER SURFACE OF THE WELDING TIP GAS NOZZLE SO THAT RELATIVE ROTATION OF THE CLEANING DEVICE AND THE NOZZLE CAUSES THE BLADES TO SCRAPE UNDESIRED RESIDUE FROM THE INTERIOR OF THE WELDING TIP.

Process and machine for friction welding

Abstract: THIS DISCLOSURE RELATES TO THE PROCESS OF FRICTION WELDING AND, SPECIFICALLY, TO A METHOD AND APPARATUS WHEREBY THE MECHANICAL WORK TRANSFERED TO THE PARTS TO BE WELDED IS CONTROLLED IN ACCORDANCE WITH A PRE-ESTABLISHED PROGRAM OF ENERGY VERSUS TIME. THE ENERGY BEING SUPPLIED TO THE WORK PIECES IS DETERMINED BY MEASURING THE ANGULAR ROTATION AND THE RESISTANT TORQUE BETWEEN THE TWO PARTS RUBBING ONE AGAINST THE OTHER, OR BY MEASURING THE TEMPERATURE OF THE PARTS. THE MEASURED VALUES ARE COMPARED TO THE REFERENCE VALUES AND THE AXIAL FORCE BETWEEN THE PARTS BEING WELDED IS CONTROLLED SO AS TO MAINTAIN THE ERROR BETWEEN THE REFERENCE AND THE ENERGY INPUT AS CLOSE TO ZERO AS POSSIBLE.

Method of the electric butt welding of workpieces

Abstract: A method of effecting electrical butt welding of workpieces by continuously flashing the ends of the workpieces to be welded to a temperature within 0.7 to 1.0 of the melting point of the workpiece material and with a variation during the welding process of the flashing rate followed by upsetting; the extremal value of the power evolving in the workpieces to be welded being maintained in the course of the flashing process, whereas upsetting is effected to a value responsive to the distance between sections of the workpieces at a predetermined heating temperature depending on the properties of the workpiece material. An apparatus for carrying into effect the said method comprises a welding machine and a device for controlling the processes of flashing and upsetting, provided with two channels for controlling the welding process.

Friction welding machine and process

Abstract: THE DISCLOSURE CONCERNS A METHOD OF FRICTION WELDING IN WHICH THE POWER ABSORBED BY THE PARTS RUBBING ONE AGAIANST THE OTHER IS CAUSED TO FOLLOW A PERSET PROGRAM OF POWER. THE ABSORBED POWER IS MEASURED CONTINUOUSLY BY MEASURING SEPARATELY THE FRICTION COUPLE AND THE ANGULAR VELOCITY OF THE WORK PIECE WHICH IS ROTATING AND FORCED AGAINST THE STATIONARY WORK PIECE. THE ABSORBED POWER IS THEM COMPARED TO A PRESET POWER PROGRAM AND THE DIFFERENCE OR ERROR BETWEEN THE TWO IS FED TO A SERVO AMPLIFIER AND OPERATOR WHICH FUNCTIONS TO CAUSE THE ABSORBED POWER TO FOLLOW THE PRESENT POWER PROGRAM. SHOULD THE ERROR EXCEED A PRESET VALUE A SIGNALLING DEVICE IS ENERGIZED TO ALERT THE MACHINE OPERATOR.

High frequency current resistance welding method for making shaped products

Abstract: In the high frequency current resistance welding of the materials requiring different heat capacities, a method for pressure welding of the materials after preheating the material requiring more heat at a position before the welding point to a temperature between 250* and 1,050* C. in an area more than onethird wider than the thickness of the material requiring less heat.

Surface treatment for welding

Abstract: This disclosure relates to electrical resistance welding and more particularly to the surface treatment of metal members along the faying and electrode engageable surfaces thereof. The faying surfaces are embossed or formed by a high energy rate method so as to be of a uniform finish whereby there will be a predetermined resistance between engaged faying surfaces thereby providing for a better control on the power required for forming a weld and the resultant metal weld.

Method for welding a conductor through cold flowable insulation

Abstract: A conductor, surrounded with cold flowable insulation, is welded to a terminal pin, e.g., by engaging the conductor and the pin between a pair of unheated welding electrodes. The electrodes are urged together with a force which reaches a value greater than a desired welding force value and is sufficient to cause the insulation to undergo cold flow out of a path between the electrodes via the conductor and the pin, thereby to render the path conductive. The force applied to the electrodes is then decreased to the desired welding force value and a pulse of welding current is passed along the conductive path when the desired force value is achieved. The current pulse is applied as the force applied to the electrodes decreases and is completed, and the molten metal formed by the current pulse is solidified, before such force is completely removed. The conductor is supplied through a passage formed in one of the electrodes.