Showing papers on "Shielded metal arc welding published in 1975"

Arc welding method and arc welding apparatus

Abstract: This invention provides arc welding methods and arc welding apparatus which weld materials by giving a plastic deformation of definite curvature to wire itself in a process before supplying the wire to a welding nozzle, restoring the wire delivered from the welding nozzle to the plastic deformation of definite curvature, delivering rotatively the end of the wire in a definite period from a delivery hole of the welding nozzle in butt welding of thick board, especially narrow gap welding.

Method of large current gas shielded arc welding

Abstract: A method of large current gas shielded arc welding wherein the welding is accomplished at high speed by a single electrode or tandem sequence electrodes in an atmosphere of a mixed shielding gas comprising essentially of an inert gas with an addition of less than 30% of carbon dioxide gas or less than 5% of oxygen and supplied at an overall flow rate of 50 to 200 l/min by using large diameter solid wire consumable electrodes of low alloy steel material with a diameter of 3.0 to 6.4 mm φ under the following conditions: welding speed 300 to 1500 mm/min; welding current, 600 to 1500 amp; and arc voltage, 23 to 36 volts. With this method, the welding of steel can be accomplished at high speeds with a reduced heat input and an improved efficiency and it is particularly well suited for the welding of open tubes for very low temperature line pipe which must retain a high degree of toughness at very low temperatures.

Process for narrow gap welding of aluminum alloy thick plates

Abstract: The narrow gap butt welding of aluminum and aluminum alloy plates of a thickness more than 20 mm with a non-consumable electrode is conducted by inserting a filling material into a welding groove, applying a direct current of more than 300 A between said non-consumable electrode which does not have a sharp end and said plates to be welded with straight polarity, maintaining an arc length from 0.5 to 5 mm and shielding the welding groove area with a shielding gas comprising at least 50% helium.

Method of multiple electrode gas shielded arc welding

Abstract: of the Disclosure In a multiple electode gas shielded arc welding method wherein a plurality of electrodes are arranged along the welding seam line of a piece of metal to be welded and the continuous gas shielded arc welding of the piece is accomplished simultaneously by the electrodes, the chemical composition of a mixed shielding gas fed to the electrodes is selected in such a manner that the chemical composition of the shielding gas fed to the leading electrode or electrode group differs relative to that fed to the trailing electrode or electrode group to have a different active gas volume ratio and in this way the chemical composition of the weld metal layers formed by the preceeding and following welding operations are homogenizing to ensure uniformity of the properties at every positions in the weld zone.

Delivery of welding flux in a method of submerged arc strip cladding of metallic work pieces

Abstract: A method and apparatus is disclosed for feeding welding flux to both the leading and trailing sides of the strip electrode used in a submerged arc strip cladding process. In order to prevent distortion of the bead shape the pressure due to the weight of the flux burden is controlled to be less in the region of the molten metal and slag pools lying directly behind the welding arc. The flux burden is caused to increase from a first depth directly behind the strip to a maximum depth at the trailing edge of the weld crater region where the quantity of liquid metal and liquid slag is a minimum.

Method of multiple gas shielded arc welding

Abstract: of the Disclosure In a method of multiple electrode gas shielded arc welding wherein a plurality of electrodes are arranged along the welding seam line of a piece of metal to be welded and the continuous gas shielded arc welding of the piece is accomplished simultaneously by the electrodes, the chemical. composition of the electrode wire of the electrode or electrode group for depositing a proceeding layer or layers is selected to differ from that of the electrode wire of another electrode or electrode group for depositing a subsequent layer or layers, whereby the chemical composition of the weld metal made by the preceed-ing welding operation is brought near to that of the weld metal made by the following welding operation and thus the uniform properties are ensured for the welding metals at the respective positions in the weld zone.

Method of and apparatus for arc welding

Abstract: Method of arc welding in which an electric arc is maintained between a welding wire and a workpiece in a thermally ionized gas which is produced by an electric arc maintained between the workpiece and the inner surface of a nozzle which acts as a non-consumable electrode as a substitute for a separate tungsten electrode.

Flux-cored wire for electric arc welding of soft steels or low-alloyed steels

Abstract: Flux-cored wire for automatic or semi-automatic arc welding process, comporting specific powder compositions as detailed in the description, which are high in amounts of metallic powders, mixed with metallic silicate solution to form a paste and baked before its introduction within a low-carbon or low-alloy steel sheath.

Lay down arc welding method

Abstract: A lay down arc welding electrode with improved weld penetration is described. The welding electrode includes a core wire surrounded by flux, a portion of which has been longitudinally removed or has been otherwise made thinner than the flux surrounding the remainder of the arc wire. The direction of arc is adjusted by varying the shapes of core wire and flux. During welding the arc welding electrode rests on a tack weld. This causes directional angle (α) to the root of the weld to increase and the divergence angle (β) to decrease, resulting in improved penetration of disposed metal. An apparatus is described for continuous lay down arc welding using the described arc welding electrode.

Welding materials for aluminum-coated steel

Abstract: In welding materials, such as a composite electrode enclosing a flux within a tubular hoop, a combination of a solid electrode and a flux, a core electrode coated with a flux and the like, for welding aluminum-coated steel comprising on weight basis less than 1.5% of Si less than 1.0% of Mn, and 2 to 15% of CaF 2 and 15 to 50% of a mixture of oxides having a basicity ranging from 1.0 to 12.5, the balance being substantially Fe.

Welding process for aluminum or chrome diffusion-coated steel

Abstract: In conducting the butt welding of a coated steel produced by applying a diffusion coating with aluminum or chromium on the surface of a chromium-molybdenum steel as the base metal, adoption of a process comprising welding the diffusion-coating side of said coated steel with a ferritic high chrome steel to begin with, next welding it with a molybdenum steel or chromium-molybdenum steel selected on the bases of the content of chromium and the content of molybdenum in the base metal, and lastly welding it with the same material as the base metal, varieties of such drawbacks as would ordinarily arise from the weld zone can be avoided.

Bonding graphite foils to iron alloys - by arc welding foil-edges under inert gas using alloyed steel electrode

Abstract: Graphite foils are bonded to Fe alloy articles by welding the foil edges with article in an electric arc, under inert gas, by using an electrode or additional material or alloyed steel, pref. contg. >12% Cr. Process is pref. used for lining chimneys and other constructional parts exposed to corrosive materials and high temps., e.g. electrostatic filters and containers. It may be applied to bonding large components and gives strong weld joints.

Properties of welded joints in alloy 01420

Abstract: 1. Alloy 01420 has satisfactory weldability in argon arc welding. The filler material was wire of alloy AMg6. 2. Alloy 01420 is not susceptible to cracking during welding. Its high susceptibility to pore formation in welded joints is due to formation of a surface film during heating. 3. The strength coefficient of welded joints of alloy 01420 (argon arc welding) is 0.7 σb of the base metal immediately after welding and 0.9–1.0 σb after solutioning and aging. The corrosion resistance of the welded joints is satisfactory.

Irradiation effects on mechanical properties of an SMAW deposited Type 308 stainless steel

Abstract: Preand post-irradiation tensile and creep-rupture tests have been conducted on an SMAWdeposited Type 308 stainless steel containing controlled residual elements (CRE) boron, phosphorus and titanium. Fast reactor (EBR-II) neutron irradiation produced changes in the mechanical properties which are broadly consistent with trends established in wrought austenitic stainless steels. However, some behavioral differences, both prior to and after i r radiat ion, are noted: higher asdeposited yield strength, lower ductility, lower ability to strain harden and a lower irradiation damage accumulation rate in the CRE 308 weld metal. All of these differences can be associated with inherent differences in the microstructure and thermal-mechanical history between the weld deposited CRE 308 and the wrought Type 304 stainless steel.

Anchor studs and shear connectors used in welding

Abstract: An arc welding process and metal anchor stud used in the process are disclosed. The stud has a generally cylindrical configuration with the base or weld end enlarged in such a manner that, following the electrode or stick welding thereof, the area of metal contact in the weld fillet adjacent the periphery of the enlargement is in excess of the cross-sectional area of the stud shank above the enlargement. The welding process produces a full 360 DEG weld fillet and is readily performed by a hand gun.