Showing papers on "Gas metal arc 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.

Arc welding process and electrode for stainless steel

Abstract: There is disclosed an arc welding process for stainless steel and a flux-cored electrode particularly useful therein. In one embodiment, means are provided for limiting the moisture content of the electrode as applied to the workpiece. In another embodiment the electrode is formulated of components having relatively low moisture absorptivity.

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.

Consumable welding rod for welding chromium steels and the resultant welds

Abstract: The consumable welding rods contain titanium and niobium in amounts such that a weld formed by melting the rod contains titanium niobium in an amount corresponding to the expression 2Ti+ Nb (6-14)C wherein Ti, Nb and C are the proportion of titanium, niobium and carbon in said weld metal. The proportion of titanium and niobium in the welding rod is determined by estimating the total quantity of carbon in the weld metal, the quantities of carbon, titanium and niobium lost by oxidation during welding and the variations in the quantities of titanium and niobium in the weld metal resulting from the welding process.

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.

Avoidance of current interference in consumable contact hot wire arc welding

Abstract: Arc-working apparatus with multiple current-carrying electrodes including in one embodiment a tungsten cathode-type arcing electrode, a workpiece, and a continuously fed hot wire electrode in electrical contact with the workpiece for depositing metal at the arc-heated area. Time-spaced current pulses for melting the contacting tip of the hot wire electrode alternate with timespaced pulses of the arcing current for avoiding interaction of the respective pulsing magnetic fields and arc interference; in other embodiments more than two arcing electrodes and a common workpiece arc connected to current time-sharing circuits for avoiding magnetic field interaction and arc interference.

Method of and device for plasma arc welding

Abstract: A method and apparatus for plasma arc welding in which an electrically conductive or nonconductive filler wire is fed axially into the plasma arc.

Anodized aluminum welding torch

Abstract: A gas arc welding torch in which the nozzle is made of anodized aluminum and the contact tube is clad with anodized aluminum to prevent the sticking of weld spatter to these parts

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 of arc welding for hard facing

Abstract: In welding for providing a metallic work with hard facing, in which an electric arc is maintained between a consumable tape electrode and said metallic work, the arc being submerged in powder of flux, while the surface of said metallic work is being gradually coated with the molten electrode material; the improvement comprises the application of a magnetic field during the welding process to eliminate the malignant effect of a circular magnetic field around the electrode caused by the welding current and thereby to obtain a uniformly coated surface.

Melt-resistant welding electrodes

Abstract: A melt-resistant, reliably performing electrode for low-power electric arcs composed of a high-melting metallic substance, such as tungsten or thoriated-tungsten, having at least the welding tip thereof coated with a layer of high-melting metal-nonmetal compound, such as metal oxides, carbides or nitrides, i.e., thorium dioxide, hafnium carbide, tantalum nitride, etc. The process for producing such an electrode is also disclosed.

Method of plasma treatment of metals

Abstract: A method is provided for plasma treatment of metals without removing the material from the treatment area (for example, welding, surfaceremelting, surfacing and the like) by a transfer plasma arc burning between the plasmatron electrode and the metal being treated, one of the electrode areas of the arc being located on said metal. The method consists in that the plasma treatment is carried out in a layer of flux and plasma is produced from a gas mixture comprising components having considerably different values of heat conductivity at arc temperatures. The component with the relatively high heat conductivity is hydrogen, helium or nitrogen, and the component with the relatively low heat conductively is neon, argon, xenon, krypton or nitrogen.

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.

Spot welding process

Abstract: A process for the production of a hollow, stiff, noncircular fabricated steel structural member in which the assembly is accomplished by spot welding. The critical spot weld in this assembly is accomplished by causing the welding current to flow along a sheet metal member then through the sheet metal member and supporting the sheet metal member along which the current flows against columnar collapse by contact with a complementary surface of a welding electrode.

Vertical electric welding with heat absorbing work lining

Abstract: A pair of thick steel plates comprising the work, are spaced edgewise to form a vertical weld gap suitable for known techniques of vertical electric welding. Within the gap, the facing edge of each plate is lined with a metal strip constituting a consumable heat sink for absorbing welding heat. The strips which are generally similar in composition to the work, are of predetermined thickness for absorbing applied welding heat in sufficient amount to prevent massive heat penetration of the work, while insuring complete fusion within the gap of the strips, the adjoining facing edges of the work and the molten weld metal.

Plasma arc welding method and apparatus

Abstract: Disclosed is a method and apparatus for minimizing the double arcing phenomena often associated with plasma arc torches. The invention is characterized in that by moving the shielding gas rapidly across the face of the torch tip at an angle to the plasma arc, the double arcing phenomena is minimized or eliminated.

Welding of reactive metals

Abstract: A method of forming welded seams between two plates or work pieces of titanium by which the weld is made at the juncture of the two plates by a shielded arc welding burner. The heat generated during the welding operation in the quasi stationary temperature weld is removed by means of fluid forcefully applied against an area of the titanium plates or work pieces on the side opposite to that where the welding is taking place so as not to reach the welding area and thereby to effect cooling to a temperature below the critical range.

Extended electrode welding technique

Abstract: : The patent relates to arc welding of relatively thick close square butt steel joints wherein the welding operation is confined to a narrow deep groove or gap and is carried out in a gaseous atmosphere.

Apparatus for gas arc welding

Abstract: Apparatus for maintaining the flow of an inert gas around the electrode of an inert gas arc welder. The welder operator momentarily depresses a pushbutton which commences the gas flow. A sensor detects the arc welding current to maintain the gas flow so long as that current is present. After the arc is broken, the gas flow is maintained for sufficient time to cool and protect the weld and electrode, and then the gas flow is automatically terminated.

Method of the arc welding and deposition of metals in vacuum

Abstract: A method of the arc welding and deposition of metals in vacuum by means of a consumable electrode, in which for the purpose of providing the stable arcing process between the electrode wire and the workpiece, the arc is stabilized by shielding the current-carrying parts of one of the electrodes with the aid of a metal envelope having a charge corresponding to the charge of the other electrode.

Nitrogen Content and Porosity of Titanium Weld Metal

Abstract: Effects of the nitrogen partial pressures in the welding atmospheres of several gas mixtures and welding conditions on the nitrogen content and porosity of titanium weld metals were systematically studied.The important conclusions obtained are as follows;1. Titanium weld metals absorb large amounts of nitrogen in arc welding in atmospheres with rich nitrogen.2. The nitrogen content of titanium weld metals decrease with an increasing welding current as in other metals.3. The existence of an oxidizing gas in arc atmospheres does not contribute to the enhancement of nitrogen absorption into titanium weld metals.4. Nitrogen absorbed causes porosity of welds.

Effect of Addition of Nitrogen of Oxygen in Shielded Gas on Porosity of MIG Aluminum Weld Metal

Abstract: For the purpose of decreasing blowholes in aluminum weld metal, this experiment was carried out under the shielding gas of argon mixed with nitrogen and/or oxygen.Results obtained are as follows:-1) Blowholes in aluminum deposited metal by MIG welding can be decreased by adding nitrogen and/or oxygen to supplied argon gas. Minimum porosity is obtained respectively for mixing ratios of argon 50%+nitrogen 50%, argon 98.5%+oxygen 6.5% (bead on plate) and argon 98.5%+oxygen 1.5% (I-butt weld).2) In case of argon and oxygen shielding gas, same spray transfer is observed by oscillogram as in the case of argon only, but under argon-nitrogen shielding gas metal transfer changes to short circuit type.

Improvements in or relating to Welding Thermocouples

Abstract: 1,162,137 Welding by fusion; making thermocouples UNITED KINGDOM ATOMIC ENERGY AUTHORITY 21 Oct, 1966 [4 Nov, 1965], No 46871/65 Headings B3A and B3R [Also in Divisions H2 and H5] In welding the casing 7 of a thermocouple 1 by the heating effect of electrons derived from a plasma arc generator 3; the sealing of the casing 7 stops current flowing through a circuit ineluding a wire 6 of the thermocouple and the arc plasma and this is detected and automatically causes the welding to be stopped Six thermocouples are mounted in one end of a glass enclosure 2 connected through a buffer volume 10 to a vacuum pump 11 The plasma arc generator 3 using argon is located at the other end of the enclosure 2 and the plasma is directed towards a steel deflector 4 having a concave end 5 Flow of electrons to the workpieces is controlled by the voltage applied to them The wires 6 are connected in turn through switch 36 to a battery 44 which provides a preheating current and charges a condenser 42 which provides the welding current The casings 7 are welded by connecting them in turn by a switch 37 to a generator 46 producing a steadily increasing voltage A checking circuit from a source 47 through a wire 6 and the plasma to the anode 12 of the plasma generator 3 is broken when the end of the casing closes due to fusion, whereupon a trip device 48 disconnects the generator 46 after a predetermined delay The thermocouple cables are prepared for welding by drilling out the magnesium oxide insulation and the wires 6 to a depth of 1 mm, removing a further 05 mm of the oxide insulation and bending the wires towards each other The plasma arc generator consists of an insulating block 21, Fig 2, mounting a conductive insert 25 carrying a tungsten cathode 14 An annular silver anode 12 is held by a threaded boss 13 against an alumina sleeve 20 surrounding the cathode 14 Cooling water inlet and outlet pipes 18, 19 are provided and argon is fed through a tube 27 A starting electrode is located downstream of the anode 12