Abstract: A method and apparatus for electron beam welding in which a single electron un is displaced from one welding position to another welding position. A welding chamber is positioned at each welding position, and all of the chambers are located under a buffer vacuum enclosure. Preferably each chamber is associated with an individual vacuum pump. During the time the welding gun is operated at one position, the welded pieces are discharged and a set of pieces to be welded is placed at another position.

Abstract: The sealing device is adapted to a vacuum enclosure which can be applied against a bearing surface and essentially comprises at least two concentric seals mounted in a support which is rigidly fixed to said enclosure and extending parallel to the bearing surface. One seal consists of a solid annular seal made of flexible material and placed near the outer edge of the enclosure. The other seal consists of a hollow and inflatable annular seal which is placed near the inner edge of the enclosure and is connected to a source of fluid under pressure by means of a closable duct.

Abstract: Flux-cored wire as mentioned below, in which a sheath of steel strip is filled with a powder, a selection of iron powders or earth carbonates or fluorides and ferro-metallic deoxidizers and arc stabilizers are added and the mixture is baked at about 570.degree. to 620.degree. C, specific compositions as detailed in the description being used in the powder, the powder specifically having added to it 1 to 3% by weight of powder of atomized silicate, and the sheath being of low-carbon or low-alloy steel, the whole being sifted preferably at 100 mesh.

Abstract: A vacuum enclosure rests on two parts to be seam-welded by the electron-beam welding technique and surrounds a support for an electron gun. The support is made up of two separable elements, the first element being constituted by a frame applied in vacuum-tight manner against the parts to be welded by means of a seal fitted on one face, the other face being applied against a flange of the second element which forms a bell-housing and is applied against the frame.

Abstract: A prefused basic flux composition comprising:______________________________________ SiO.sub.2 about 25 to about 35% Al.sub.2 O.sub.3 about 2 to about 6% TiO.sub.2 about 3 to about 7% CaF.sub.2 about 5 to about 11.25% CaO about 44 to about 52% MgO about 1 to about 10% MnO about 0.5 to about 5% Na.sub.2 O about 4.5 to about 8% K.sub.2 O about 0.5 to about 1.5% FeO 0 to about 2% ______________________________________And wherein the weight ratio of CaO to CaF.sub.2 is equal to or greater than about 4.

Abstract: Flux for welding ordinary, semi-alloyed, alloyed or special steels with a high rate of efficiency and high rate of speed and containing a relatively high amount of Fe powder.

Abstract: In flux-cored wire electrodes for vertical automatic welding, from bottom to top, there is an electric arc under gaseous protection, the wires having diameters of 1 to 4 mm and generally shaped internally in any configuration, such as tubular, heart-shaped and composite, characterized by a sheath of steel strip, and a powdered filling flux most preferably including the following ingredients in qualitative and quantitative composition by powder weight:______________________________________ Iron powder 73% Silicofluoride of potassium (K.sub.2 SiF.sub.6) 4% Cryolite (Na.sub.3 AlF.sub.6) 2% Nickel powder 3% Ferro-molybdenum (at 65 up to 75%) 0.8% Refined ferromanganese (85 up to 90%) 9.9% Ferrosilicon (45%) 1% Ferrotitanium (30%) 0.5% Micaceous iron oxide 1% Fine silica 4% Silicocalcium (SiCa) 0.8% 100.0% ______________________________________The flux-cored wires most preferably have a filling coefficient of 32 grams of powder weight per 100 grams of strip.

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.

Abstract: This invention relates to welding torches of the kind comprising a torch body which incorporates a tubular core having means of clamping a refractory electrode which projects beyond the torch body, flow-means for an arc-gas, which flow-means consists of an annular passage between the electrode and an axial flow-controlling sleeve which is arranged about said electrode and co-axially therewith, and means for circulating water to cool the torch body; and a nozzle for shielding the gas surrounding the torch body with a gap therebetween. Such torches are referred to in the industry as "TIG" torches. In such a torch the invention consists in a combination of several features viz:A. the axial length of the annular passage is at least 10mm. and its radial width is between 0.5 and 3 mm. for an axial distance of at least 5 mm. from its upstream end;B. the annular passage is connected upstream to a chamber for distributing the arc-gas andC.

Abstract: A striking process for a plasma beam at high temperature which includes an enclosure between two torches located at opposite sides of the enclosure and outside the enclosure, a stick-electrode introduced lengthwise through a window of one of the torches and brought near the opposite torch until the plasma flame hooks to the stick-electrode, thereby closing between the nozzle and the stick-electrode the circuit of a superimposed current, then pulling the stick-electrode progressively from the enclosure, carrying with it the plasma beam until it meets a second torch which is energized at the very moment of extraction of the stick-electrode, and then disconnecting the stick and closing the laminar plasma flow circuit.

Abstract: Arc welding and overlaying, particularly with strip electrodes, and particularly for overlaying by the submerged arc welding process with strip electrodes, can be regulated as to the distribution of arc energy by using strip electrodes which are run through male and female gears so that the current input of the electrodes is adjusted as to uniformity across the width of the overlay path.