Showing papers on "Shielded metal arc welding published in 1977"

Flux cored wire for welding Ni-Cr-Fe alloys

Abstract: A self-shielding, flux cored arc welding electrode for joining Ni-Cr-Fe alloys and overlaying dissimilar metals. The wire has a nickel-chromium containing alloy sheath and a flux core containing special proportions of carbonates, fluorides, metal oxides, and powdered metals. Sound welds can be prepared without the use of a supplemental inert shielding gas. Welded joints provide essentially the same properties as those of the Ni-Cr-Fe base alloy.

Method of and device for arc welding

Abstract: A method of plasma MIG welding in which an arc is maintained between a workpiece and a welding wire in a thermally ionized gas (auxiliary plasma) which is generated by an electric gas-discharge between two non-consumable electrodes; neither the welding wire nor the workpiece acts as a single electrode for generating the thermally ionized gas.

Method of arc welding under water

Abstract: In a method of arc welding under water or at superatmospheric pressure (or both) the weld is made in a chamber containing a gaseous atmosphere. The weld metal is deposited from flux-cored welding wire whose core contains strong deoxidant(s) such as aluminium, magnesium, titanium, zirconium, lithium and calcium. A shielding gas containing a selected proportion of oxygen or oxygen-containing gas but consisting mainly of an inert gas such as argon or helium is employed to surround the arc. The shielding gas is constituted by the atmosphere in the chamber.

Welding, a steel suitable for use therein

Abstract: A steel which contains up to 0.15% carbon, 0.5 to 1.5% manganese, 0.03 to 0.10% silicon, less than 0.2% molybdenum, up to 0.05 aluminum, 0.03 to 0.05% titanium and 0.002 to 0.008% boron is particularly suitable as a welding consumable, for example as an electrode for the submerged arc welding of high strength micro-alloyed structural steels. Especially when used with a basic flux, welds can be produced showing excellent notch toughness characteristics.

Automatic arc welding method for high efficiency multielectrodes of low temperature high toughness steel

Abstract: PURPOSE: To weld the thick steel plate, having a superior low temperature toughness, with a high efficiency, by forming the root pass bead with HIG welding using the wire, restricted C, P, S by multielectrodes automatic welding and carrying out submerged arc welding by heat input quantity of the wire, having a specific composition. COPYRIGHT: (C)1978,JPO&Japio

Welding method for manufacture of thick walled steel pipe

Abstract: PURPOSE: To improve the low-temperature toughness of the weld zone in the thick walled steel pipe, by finishing the surface layer of the weld zone according to the submerged arc welding, after carrying out the MIG welding on the groove face, prepared into a specified shape, by supplying a large welding current to the thin wire and by giving a vibration to this thin wire. COPYRIGHT: (C)1978,JPO&Japio

Welding method by direct current gas shielded arc

Abstract: PURPOSE: To form the weld zone having a superior mechanical property with a high welding efficiency without producing a bad bead by deoxidation product, by carrying out direct current gas shielded arc welding with shielding gas, core wire and more than two electrodes applied different welding current. CONSTITUTION: On occasion of using two electrodes, the distance between the preceding electrode 1 and the succeeding electrode 2 is kept apart more than 100mm. Shielding gas mixed more than 30% of CO 2 gas or less than 5% of O 2 gas with inactive gas, such pure Ar gas or He gas etc., is used in the ratio of 15W100l/ min. at the electrode 1 and 0.6W1.6mmϕ of the core wire 12 and 100W500A of welding current, are used. Shilelding gas mixed 7.5W50% of CO 2 or 1W10% of O 2 gas with pure Ar gas or He gas, is used in the ratio more than 50kg/min. at the electrode 2. 3W6.4mmϕ of large core wire is used for the core wire 22 and 600W1500A of welding current is used. The deoxidation product 8 is not moved in fron of arc and the weld zne 7 havig a superior impact value, is able to obtain. COPYRIGHT: (C)1979,JPO&Japio

Welding method for ferritic stainless steel

Abstract: PURPOSE: To weld ferritic stainless steel efficiently to produce weld joint of excellent mechanical property by utilization of metallurgical reaction of CO 2 and molten metal through mixing CO 2 of specific quantity with inactive shield gas for nonconsumable electrode type arc welding machine. COPYRIGHT: (C)1978,JPO&Japio

Method of and apparatus for welding sheet steel panels

Abstract: A method of and apparatus for welding sheet steel panels by submerged arc welding is described. By providing one or, depending on the thickness of the sheet steel panels, more than one pair of closely spaced wire electrodes in the weld gap with the simultaneous introduction of additional filler metal carrying no current, preferably in the form of a metal powder, disadvantages associated with known methods may be avoided.

One-side arc welding method for 9% ni steel

Abstract: PURPOSE: To obtain sufficient welded joint strength as well as uniform Uranami in one-side arc welding of thin 9% Ni steel by specifying the shape of bevel, the compsn. of a weld material and that of a secondary filler metal so as to reduce dilution of a weld metal with the base material. COPYRIGHT: (C)1978,JPO&Japio

Evaluation of the Potential Retinal Hazards from Optical Radiation Generated by Electric Welding and Cutting ARCS December 1975 - April 1977.

Abstract: : A special study of the potential retinal hazards from direct viewing of various welding processes was conducted by the US Army Environmental Hygiene Agency as part of a cooperative effort with the American Welding Safety Committee on Safety and Health of the Project Committee on Radiation It was determined that potentially hazardous levels of visible radiation were emitted by all of the welding processes that were evaluated and that recommended filter shade numbers were generally adequate These processes included: gas tungsten arc welding, flux cored arc welding, plasma arc cutting, plasma arc welding and shielded metal arc welding (Author)

Arc chute having plates coated with weld deterent material

Abstract: An arc chute for assisting in the extinction of an arc drawn between circuit interrupting contacts opening in air includes a stack of closely spaced metallic plates coated with a weld deterent material, such as silicone varnish. By virtue of this coating, the propensity of metal particles condensed from the metal vapor generated by the arc to weld to the arc plate surfaces is reduced. Consequently, material degradation of the arc chute dielectric strength is avoided, and arc reignition is discouraged.

Air carbon arc gouging

Abstract: Air carbon arc gouging is a relatively inexpensive process for removing or cutting metal more rapidly than by grinding, flame gouging, or chipping. An arc is established between a carbon-graphite electrode and the workpiece; and the metal by the arc is blown away by a high-velocity air jet directed at the arc. The process can be used in a number of applications, including cutting or trimming parts to size, removing excess metal, and for cutting bevels for weld preparation. Unlike oxyfuel gas cutting, the new process can be used for most metals of engineering importance, incuding those that produce high-melting refractory lags. Stainless steel, cast iron, nickel, and copper alloys can be cut or gouged as easily as carbon steel. A detailed description of the process is given under the following headings: Equipment--cutting torch; carbon electrode, AC and DC plain and copper-coated; power sources for currents of up to 500 A; air supply at pressures from 40 to 80 psi with consumptions of 3 to 25 cfm. Techniques for Manual Gouging and Cutting, with notes on the different procedures for various base metals. Health Considerations, including precautions against excessive noise, burns, electric shock, arc radiation, and air contaminants. Among the conclusions, the Author points out that the air stream must have sufficient velocity and volume to clean the slag thoroughly from the kerf; and that trained operators are needed to produce high-quality results.

Welding method for manufacture of thick-walled large diameter welded steel pipe

Abstract: PURPOSE: To form the weld zone superior in the low-temperature toughness depending onone-pass-welding worked from both surfaces of the weld zone, by welding under an optimum combination of the groove shape and the welding method, in the welding of the thick-walled large diameter steel pipe. COPYRIGHT: (C)1978,JPO&Japio

Evaluation of the potential retinal hazards from optical radiation generated by electric welding and cutting arcs December 1975--April 1977. Nonionizing radiation protection special study

Abstract: A special study of the potential retinal hazards from direct viewing of various welding processes was conducted by the US Army Environmental Hygiene Agency as part of a cooperative effort with the American Welding Safety Committee on Safety and Health of the Project Committee on Radiation. It was determined that potentially hazardous levels of visible radiation were emitted by all of the welding processes that were evaluated and that recommended filter shade numbers were generally adequate. These processes included: gas tungsten arc welding, flux cored arc welding, plasma arc cutting, plasma arc welding and shielded metal arc welding.

Submerged arc welding process for nickel containing steel

Abstract: This invention provides a process involving submerged arc welding for nickel containing steel such as steel containing 3.5 weight percent of nickel. The process uses a bond type flux of specific composition to suppress the oxygen content in the weld metal. Further, the process utilizes a cored welding wire including a core material of specific composition. As the result, it is possible to obtain a weld metal of high impact-resistance at low temperatures such as minus 100° C.

Continuous anode mode for high-speed tungsten/inert-gas arc welding

Abstract: It has been reported recently that, for an arc in air between a stationary thoriated tungsten rod cathode and two copper anode cylinders rotating together end to end, the arc current, when above a certain critical value, divides and flows from a stationary bell-shaped arc column into continuous `diffuse? electron-collecting areas on the two anodes, instead of into separate anode spots with an arc column jumping from one to another. Because of possible advances in high-speed welding techniques, to which this continuous anode mode may lead, this work has now been extended to stainless-steel anodes in a shielding flow of argon. It is shown that this same mode does exist both for these conditons, and also when small percentages of hydrogen are added to the shielding gas, whereby useful increases in workpiece melting are achieved for the same arc current.

The effect of nb on the submerged arc welding of line pipe steel.

Abstract: This project was undertaken to determine the effects of niobium and carbon on the properties of the seam welds in HSLA steels for line-pipe. To relate this study to industrial practice the initial efforts were devoted to matching the characteristics of welds produced in the laboratory in carbonmanganese steels to those obtained with industrial parameters. Effects of niobium and carbon were studied by varying these two elements in six test plates of carbon-manganese steel. Two levels of carbon; 0.05% and 0.11% were used in conjunction with three levels of niobium <0.005%, 0.05% and 0.12%. Welds were made with parameters which corelated well to industrial practices. Charpy "V" notch specimens were then removed from the welded plates and tested. The resulting transition curves revealed that the higher carbon content welds displayed superior impact energy absorption versus temperature curves at the 27, 54 and 81 joule levels compared to the lower carbon weld metals. Metallographic samples showed the higher carbon weld to have much finer ferrite veining and finer bainite than the low carbon welds. The results presented here show that an increase in the carbon level from 0.05% to approximately 0.10% in niobium steels containing up to 0.06% niobium will produce higher weld metal toughness. This is due to the carbon shifting the austenite transformation to a lower temperature caused by the movement of the nose of the CCT diagram to longer times. Which allows the Nb (C, N) to precipitate out in the austenite and not affect the strength of the ferrite.

Process and coated welding rod for welding white cast iron

Abstract: A process for the electric arc welding of cast iron, specifically white cast iron, is provided which comprises electrically applying to the cast iron to be welded, at welding temperatures, a welding material obtained by melting a welding rod containing, by weight, from about 2.30 to about 3.00 percent carbon, from about 0.03 to about 0.06 percent chromium, from about 0.01 to about 0.04 percent nickel, about 0.01 percent molybdenum, from about 0.82 to about 0.90 percent manganese, from about 0.023 to about 0.032 percent sulphur, from about 0.103 to about 0.115 percent phosphorus, about 2.64 percent silicon, with the balance being iron plus incidental impurities, with the welding rod having a low hydrogen flux.