Showing papers on "Submerged 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.

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.

Non-consumable electrode vacuum arc furnaces for steel, zirconium, titanium and other metals and processes for working said metals

Abstract: Degassing apparatus similar to that employed in the D-H process includes means for producing an electric arc of controllable power within the vacuum degassing chamber during the degassing operation to supply heat to the molten material. The electrode includes means forming a fluid cooled arcing surface and a magnetic field coil for setting up a magnetic field so oriented with respect to the arc that a force is exerted on the arc which substantially continuously moves the arc along the arcing surface thereby reducing evaporation of material from the arcing surface and resulting in a more even distribution of heat to the molten metal within the vacuum chamber.

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.

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.

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 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.

Vertical gap arc welding

Abstract: A method and a device for vertical electric arc welding, particularly in a narrow gap. The contact member is located outside the gap, and the welding wire is curved from its source to be directed substantially vertically into the molten pool.

Continuous lay down arc welding method

Abstract: This invention is a continuous lay down arc welding method wherein current supplying points are provided at proper intervals on a connected welding electrode or nonconnected long welding electrode and current supplying apparatus operated by the arc light or arc heat are set so that unmanned welding may be automatically made only by switching the welder.

Method and apparatus for stabilizing an arc

Abstract: A method and apparatus for stabilizing an arc established in an arc device having two axially spaced electrodes, at least one being a hollow electrode wherein a cooling fluid is passed along the outside surface of the hollow electrode at varying speeds to create a hot surface on the inside surface of said electrode which will form a zone from which the arc will not wander.

Arc Welding Electrodes

Abstract: 1,160,156 Welding by fusion MUREX WELDING PROCESSES Ltd 18 April, 1968 [18 April, 1967], No 17815/67 Heading B3R [Also in Division C7] A tubular electrode for submerged arc welding has a sheath of mild steel or stainless steel and a core containing alloying agents and produces the following weld deposit:- 012% max C 20-28% Cr 9-14% Ni 0A8% max Si 0A5-3% Mn 0-4% Mo 0-1A5% Nb balance Fe The core is 35-45% by weight of the electrode and includes 0-10% of flux Fluxing constituents of the core may be calcium fluoride, calcium carbonate, potassium felspar and cryolite The sheath may be mild steel 17% Cr steel or 18% Cr, 8% Ni steel Specified core compositions are within the following ranges:- 26-68% Cr 10-33% Ni 2-4% Fe-Mn 0-55% Fe 0-6% Fe-Nb 0-9% Fe-Mo 0-10% flux The electrode may have the following com position:- 012% max C 22A5-35% Cr 9-14% Ni 1A2% max Si 0A6-4% Mn 0-5A6% Mo 0-2A4% Nb balance Fe A suitable submerged arc welding flux is:- 5-20% MnO 20-40% SiO 2 25-50% CaO 2 +MgO (20% min CaO) 3-20% CaF 2 (NaF may replace up to 10%) 0-25% Al 2 O 3

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.

Spatter protecting nozzle coating

Abstract: In the automatic or semiautomatic welding of metals which involves passing an electric arc from a consumable metal electrode in a welding nozzle, a method of protecting said nozzle from spatter during said welding which comprises contacting the nozzle heated to elevated temperature with a hydrocarbon petrolatum grease prior to welding whereby to coat said surfaces with said petrolatum grease.

Improvements in Arc Welding

Abstract: 1,162,473. Welding by fusion. MUREX WELDING PROCESSES Ltd. 25 Jan., 1968 [9 Feb., 1967], No. 3952/68. Heading B3R. [Also in Division C7] Steel having high impact strength at low temperatures is deposited by submerged arc welding using a continuous electrode having a tubular mild steel sheath enclosing a core constituting 28-38% by weight of the electrode and of the following composition:- 2A5-12% nickel powder 0 - 2% ferro-molybdenum (e.g., 65-75% Mo, 0-2% Al, 0-2% Si, balance Fe) 0 - 1% ferro-silicon (e.g., 40-50% Si, 0- 2% Al, balance Fe) 2A5- 5% manganese as ferro-alloy (e.g., 78- 80% Mn, 6-7% C, balance Fe) balance iron powder and a submerged arc flux of the following composition:- 5-10% MnO 30-45% SiO 2 15-30% CaO 5-12% CaF 2 5-25% Al 2 O 3 2-25% MgO The manganese may be present as low carbon ferro-manganese. Steel weld deposits having alloying constituents within the following ranges may be so produced:- 0A03-0A04% C 0.3% Si 1A1 -3A1% Ni 0A9-1A1% Mn

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.

Determination of the Feasibility of Shielded-Metal-Arc Welding and Oxygen-Arc Cutting at a Depth of 600 Feet to The United States Navy.

Abstract: : Underwater arc welding and oxygen-arc cutting have been used in salvage and repair operations for many years. These processes have been used, however, only at shallow depths, typically less than 100 feet. Before extending the use of arc welding and cutting to significantly greater depths, the feasibility of these processes at the greater depths must be known and potential problem areas must be identified.

Submerged-welding method

Abstract: A submerged-arc-welding method using a bare metal welding electrode at high speeds and currents above 1,000 amperes in which the voltage across the arc is held sufficiently small to eliminate the positive column of the welding arc which then consists only of anode fall or drop and cathode fall or drop. The voltage is established between 22 and 24 volts with currents of 1,000 to 4,000 amperes and weld wire thicknesses of 6 to 8 mm. are used when the current is between 1,500 and 2,500 amperes but above 7.0 mm. with currents above 2,500 amperes.