Showing papers on "Gas metal arc welding published in 1968"

Plasma generator with magnetic focussing and with additional admission of gas

Abstract: This invention relates to a plasma arc generator, operating with a DC or AC supply and having improved characteristics by virtue of arrangements for rotating the arc and the injected gas, which may be air or nitrogen for example. The plasma arc generator, is suitable for cutting, welding, built-up welding, (i.e. welding, in which a deposit of metals is built-up), metallizing and promoting chemical reactions.

Automatic arc welding electrode with an electrically conductive flux coating

Abstract: The invention consists of a continuous electric arc welding electrode of indefinite length consisting of a metal core and an outer coating which is electrically conductive so that the electrode can be energized by sliding it across conventional electrical contacts. The coating is comprised of: a mixture of an organic resin, which chars when heated to elevated temperatures; carbon or metal powders which conduct current through the resin; and, possibly other known fluxing ingredients. A thin outer metallic coating is often also used which conducts current from the contacts circumferentially and longitudinally to the electrically conductive coating.

Out-of-position automatic cored welding electrode

Abstract: Coredtype arc-welding steel electrode particularly intended for out-of-position welding wherein the ingredients in the core provide a pinch-effect type metal transfer at relatively low arc currents as well as a viscous slag which prevents the molten metal in the weld pool from being pulled out of the weld pool by the force of gravity. The ingredients making up the core provide a CaF2 metallic oxide slag system which provides a shielding action to the arc, plus as an essential ingredient(s), a compound of barium or strontium or both.

Welding wire or welding rod

Abstract: A welding wire or welding rod comprising a metallic sheath composed of grains or granules of inorganic welding materials embedded in and bonded by a solidified matrix consisting of an inorganic anhydrous compound selected from the group comprising chromium oxides and boric oxide.

Ventilation Requirements for Gas-Metal-Are Welding versus Covered-Electrode Welding

Abstract: The purpose of the study was to compare gas-metal-arc welding with covered-electrode welding and to determine if ventilation requirements for the two processes should be different. Solenoid valves set for inhalation and exhalation times observed in the normal adult male were used to simulate breathing by a plaster dummy head. The plaster head, mounted on an automatic welding head carriage, moved parallel to the welding direction so that its position remained fixed relative to the welding arc. Air samples were taken concurrently inside and outside the helmet worn by the dummy during the welding process. Samples were analyzed for concentrations of iron oxide, nitrogen dioxide, ozone, fluorides, and carbon monoxide. Combinations of five wire electrodes, three of which were flux-cored, and five shielding gases were evaluated. One type of coated-rod electrode was used for comparison purposes.

Welding wire for the electric arc welding in air

Abstract: Welding electrode having an iron containing casing and a core containing calcium fluoride, titanium dioxide and potash feldspar.

Copper welding process

Abstract: 1,219,235. Welding by fusion. E. I. DU PONT DE NEMOURS & CO. 5 March, 1969 [29 May, 1968], No. 11807/69. Heading B3R. In TIG-welding of copper, welds free from oxide occlusions, objectionable porosity and lack of ductility are obtained by providing around the outside of the entire, or at least the leading edge of, the usual shield of inert gas (e.g. helium, argon or mixtures) a further, non- inflammable gaseous shield comprising a mixture of non-oxidizing, non-combustible gas (e.g. nitrogen, helium or argon) and a gaseous reducing agent (preferably at least 5% of the mixture) selected from hydrocarbons with up to 4 carbon atoms and methanol, ethanol and isopropanol vapours. As shown, nitrogen containing and preferably saturated with, methanol (or ethanol) vapour is supplied to a chamber 8 surrounding an inner nozzle 3 through which inert gas providing the usual arc-surrounding shield is directed. The gas in the chamber 8 is directed through a continuous narrow opening or one or more slots or, as shown, orifices 11 in the chamber wall 10 to provide the further shield. Additional copper may be supplied by a copper filler wire or rod 6. In Fig. 3 (not shown) nitrogen, from a tank (13) is taken through a body of methanol (16). In an example of butt welding, with filler rod, electrolytic copper plates are bevelled (at 38-45 degrees) and clamped in position with a copper backing strip. When welded on one side, the workpiece is turned over, the root chipped out, and the final weld effected.

Welding Electrode for Hard Surfacing of Steel Parts

Abstract: 1,181,940. Welding by fusion. INSTITUT ELEKTROSVARKI IMENI E.O. PATONA. 11 Sept., 1968, No. 43188/68. Heading B3R. Also in Division C7] A welding electrode for hard surfacing steel parts consists of a low carbon steel tube cored with a mixture containing ferrochrome, ferromolybdenum, ferrovanadium, ferrosilicon, ferromanganese, chromium metal, sodium silicofluoride and iron powder. Gas shielded or submerged arc welding is used. A core constituting 33-37% by weight of the electrode is composed of:- The electrode when used with the following submerged arc welding flux:- produced the following weld deposit:- The weld had a bainite structure. The steel workpiece was preheated to 350-380‹ C.

Method of moulded welding with consumable nozzle

Abstract: A process of arc welding comprises providing a consumable nozzle disposed at the gap where a butt joint is to be made and disposing a separate electrical conductor wire at the gap to define a measuring probe. The measuring probe measures the arc voltage across the slag pool and the welding current is controlled by the aforesaid measured voltage to maintain the arc voltage or voltage across the slag pool substantially constant.

Arc welding for controlling weld penetration

Abstract: An arc-welding process and apparatus are disclosed in which melting conditions and depth of penetration of the arc are detected to permit control of the welding current, welding speed and the like. An insulated electrode, or conductor, is provided connected at one end to the power supply terminal connected to the workpiece, the electrode being disposed within or adjacent to the edges to be welded. An ammeter connected in series with the electrode provides a reading of the shunt current as the welding arc approaches and reaches the electrode, the shunt current providing the means for controlling the welding current, welding speed, and the like.