Abstract: An electrode orientation checking apparatus includes a machine stand attached to a seam welding apparatus from which one roller electrode of a set has been removed, a positioning guide and a set of distance sensors that are provided on the machine stand, and a calculating section. A positioning surface of the positioning guide is fixed at a position corresponding to a portion of an outer circumferential surface of the one roller electrode before being removed, the portion lying on a line segment connecting rotational centers of the roller electrodes. The distance sensors are respectively fixed forward and backward of the positioning surface in a progression direction of the roller electrodes. The calculating section calculates data for acquiring a direction of the line segment relative to the stacked body.

Abstract: Radial or axial-radial flow catalytic chemical reactor comprising a cylindrical shell and at least one catalytic bed and comprising a plurality of perforated tubes, said tubes having an open end communicating with an inlet of a gaseous flow of reagents in the reactor, said tubes being provided with a plurality of holes on their side surface, said tubes being arranged around the catalytic bed so as to form an outer wall which bounds the catalytic bed and which distributes the reagents inside said bed; each of said tubes being formed by means of longitudinal or helical butt welding of a perforated strip.

Abstract: A seam welding device sandwiches between a first roller electrode and a second roller electrode a laminate, which is formed by laminating a plurality of workpieces and disposing the thinnest workpiece, which has the smallest thickness among the workpieces, on the outside, to carry out seam welding. The second roller electrode, which is in contact with the thinnest workpiece, is disposed further along the direction of welding progress than the first roller electrode.

Abstract: The invention relates to a method for forming a three-dimensional article through successive fusion of locations of a powder bed. The method comprising: providing a model of said three-dimensional article; applying a powder layer on a work table; determining a maximum scan length of an energy beam; directing said energy beam from a first energy beam source over said work table with constant energy causing said first powder layer to fuse in first selected locations according to said model to form a first cross section of said three-dimensional article, wherein locations with a shorter scan length than said maximum scan length is provided with a time sink before and/or after said scan line so that the time period between each two adjacent scan lines is constant throughout the manufacture of said three-dimensional article.

Abstract: A method of fabricating a precoated steel plate, the method including coating a steel plate by dipping the steel plate in a molten bath to obtain a precoat upon the steel plate, wherein the precoat includes an intermetallic alloy layer and a metal alloy layer. The intermetallic alloy layer is topped by the metal alloy layer. On at least one face of the plate, the metal alloy layer is removed in an area at a periphery of the plate using a laser beam, while leaving at least part of the intermetallic alloy layer in the area. The at least part of the intermetallic layer in the area has a thickness between 3 and 10 micrometers thick.

Abstract: A flow through fluid pressure vessel of the type containing filter bags formed by a tubular shell, a one-piece cast bottom closure with an integral outlet port fitting welded to one end of the shell, a one-piece cast combination bulkhead and flange ring welded to the opposite end of the shell, a cast inlet fitting inserted through an aperture in the shell and connected to an inlet opening through the bulkhead and welded to the shell aperture. A cast closure/lid forms an inlet plenum with the bulkhead and is releasably sealed over the flange ring.

Abstract: A transformer includes an enclosed tank having an interior and an enclosed radiator spaced from the tank and in fluid communication with the interior. The radiator includes two panels joined to define a substantially enclosed space. The panels have opposing faces and bottom ends. The bottom ends of the panels are joined together by a first weld and portions of the opposing faces of the panels are joined together by a plurality of second welds. The first weld and the plurality of second welds are constructed and arranged such that when an over-pressure condition occurs in the tank and thus in the radiator, the second welds will break generally uniformly permitting the panels to balloon generally uniformly, directing a rupture of the radiator to occur at the first weld, without any rupture of the tank occurring.

Abstract: In various embodiments, joined sputtering targets are formed at least in part by spray deposition of the sputtering material and/or welding.

Abstract: It is an object of the present invention to provide a seam welding warpage prevention method and apparatus capable of preventing warpage caused by cooling contraction after welding, in a case where workpieces are different from one another in material and thickness, and thus not uniform in thermal contraction. In the seam welding warpage prevention method for welding a plurality of workpieces W1 and W2 that are not uniform in thermal contraction with respect to an energizing direction, the workpieces W1 and W2 are clamped with a pair of roller electrodes 23 and 33 while applying current. The welding is performed in a state where the roller electrode 33 that abuts on the workpiece W2 having higher thermal contraction is offset in an advancing direction ahead of the roller electrode 23 that abuts on the workpiece W1 having lower thermal contraction.

Abstract: A pair of upper and lower electrode wheels 1, 2 are disposed so that their axes 17, 18 are tilted in a horizontal plane in respective directions opposite to each other with respect to a straight line Y perpendicular to a welding line X defined on overlapping portions (L) of two metal plates 5, 6, and mash seam welding is performed while positively driving electric motors 61, 62. This can reduce the increased amount of thickness and step gradient of a joint portion to reduce a stress concentration factor and ensure joint strength. The metal plates are joined to each other such that a nugget N is not deviated from a joint interface. Therefore, it is possible to prevent respective ends of the metal plates at the overlapping portions L from biting into and scratching the corresponding electrode wheels 1, 2 and to prevent spattering during the welding.

Abstract: A plurality of attachments having springs hold the outer plate of a fuel tank, and an inner jig positions the inner plate. The attachments are attached to clamp arms which are opened/closed by cylinders. When the overlap portion between the outer and inner plates is welded, the thermal deformation caused by welding is accommodated by the springs. The attachments are spaced from the fuel tank in the order in which the welding point is approached.

Abstract: A butt welding apparatus and a butt welding method where end faces of at least one plate member to be welded are butted to each other to form a butt portion, and butt welding can be performed on respective plate members which have various thickness sizes on both side portions of the butt portion with electric resistance heat by a pair of electrode members which are common to the respective plate members. At least one electrode member (1) is provided on an outer face thereof with a convex portion (1A) which gradually retreats from one plate member (31) of two plate members (31, 32) as it extends from an intermediate portion, in a thickness direction, of the one electrode member (1) along the one plate member (31).

Abstract: A butt welding apparatus, a butt welding method, and a product manufactured by the butt welding method involves two electrode rollers disposed on both the front and back sides of a thick sheet member and a thin sheet member whose end surfaces are butted. The electrode rollers bridge across the sheet members and are composed of small diameter portions on the side of the thick sheet member and large diameter portions on the side of the thin sheet member. The small diameter portions come into contact with and press the thick sheet member before the large diameter portions come into contact with the thin sheet member. Thus, the end surface of the thick sheet member swells and deforms toward the thin sheet member and reliably comes into contact with the end surface of the thin sheet member, and power is applied between the end surfaces, even if not polished.

Abstract: A method of monitoring a ball forming process in a wire bonder. A glow discharge parameter between an electrode on the wire bonder and an end of a wire mounted on the wire bonder on which the ball is being formed is monitored. The monitored parameter is compared with a reference value to determine whether the ball formed is satisfactory.

Abstract: A welding device for butt welding of bars as well as blooms, slabs, or billets produced by continuous casting, includes a roller conveyor for simultaneous conveying of at least two bars along a rolling line, jaws for gripping the bars, and electric power supplies which are set in contact with the surfaces of the two bars for carrying out a welding operation. The electric power supplies are provided with respective positioning and actuating devices controlled to actuate them independently from one another during setting in contact and detachment of the bars.

Abstract: A welding device for butt welding of bars, blooms, slabs, or billets produced by continuous casting comprises a roller conveyor for simultaneous conveying of at least two bars along a rolling line, jaws for gripping bars, electric power supplies which are set in contact with the surfaces of the two bars, for carrying out a welding operation. The electric power supplies are provided with respective positioning and actuating means, controlled by an actuation device which actuates them independently from one another during setting in contact and detachment of the bars.

Abstract: An installation for positioning edge to edge and welding by means of a laser beam at least two sheet blanks comprises means for supporting and positioning a first sheet blank in a horizontal reference plane, means for positioning the edge to be welded of the first sheet blank on the axis of the laser beam, means for maintaining the edge to be welded of the first sheet blank, means for clamping the first sheet blank, means for supporting and positioning at least one second sheet blank, means for maintaining the edge to be welded of the second sheet blank against the edge to be welded of the first sheet blank, means for clamping with a sectorized pressure the second sheet blank, means for exerting a lateral and sectorized pressure on the edges to be welded of the sheet blanks, and a welding unit employing a laser beam movable along the joint plane of the sheet blanks to be welded.

Abstract: In a crop shear apparatus disposed in a conveyance passage in which band steel is conveyed from a first rolling mill to a second rolling mill of hot rolling equipment, the crop shear apparatus including: at least one shear blade for shearing the band steel in a widthwise direction conveyed from the first rolling mill to the second rolling mill; and a supporting mechanism for movably supporting the at least one shear blades in the widthwise direction of the band steel, wherein the at least one shear blade is present in a non-linear manner along the widthwise direction of the band steel such that a projection quantity of the band steel in the conveyance direction at a sheared end portion can be adjusted when the band steel is sheared in a state where the blade has been moved in the widthwise direction of the band steel and the shear blade is formed into a non-mirror-symmetrical shape on two side portions of a portion which corresponds to the center in the widthwise direction of the band steel, a projection quan

Abstract: A multi-gauge composite metal strip is produced from a plurality of individual metal strips of different thicknesses. The individual strips are heated, passed through an oxide reducing atmosphere and are then directed between a pair of work rolls with their adjacent edges arranged in a mutually overlapping relationship. The rolling action effects a reduction in the thickness of each strip while simultaneously effecting solid phase bonding of their overlapping edges. The resulting composite multi-gauge strip is subjected to tensile stresses which exceed the yield strength of the strip materials at the time and in the condition at which the composite strip exits from between the work rolls.

Abstract: A butt welding method is disclosed, which comprises abutting a pair of steel sheets and welding the abutting surfaces by opposing electrodes while preventing gaps from developing between the widthwise outer portions of said steel sheets by suppressing rotational deformation of the abutting surfaces in the widthwise outer portions thereof.

Abstract: The invention relates to a process for guiding sheets or strips to be butt-welded together and to an apparatus with means for conveying and guiding sheets or strips to be butt-welded together. The sheets or strips, lying laterally next to one another, each with one of its side edges against a guide surface lying in the same vertical plane, are brought into contact without gaps in the same horizontal plane, on conveying planes inclined at an acute angle relative to one another. In the apparatus, the conveying means, especially roller tables, form conveying planes arranged at an acute angle .alpha. relative to one another. The guide means consist of guide surfaces lying in the same vertical plane. Thus, strips or sheets can be guided continuously past a fixed welding device in order to be welded together without gaps.

Abstract: Disclosed are welding current pick-ups which are switched into welding circuits. Outputs of these pick-ups are connected to inputs of a logical coincidence unit having its output connected to a control input of a welding program control unit whose output is connected with a drive adapted for moving the workpieces being welded.

Abstract: Method for manufacturing heat exchange panels each comprising a plurality of sub-panels of finite length, each sub-panel comprising a metal tube welded to a metal sheet except at the end portions thereof which are secured to headers in fluid-tight relation thereto, in which method tubing and metal sheet having a length several times the length of the sub-panel are continuously advanced and welded together by high frequency electric current which is interrupted periodically so that a unit several times the length of a sub-panel and having tubing welded to the sheet by a weld which is continuous except at portions of the tubing spaced apart longitudinally by a distance substantially equal to the length of a sub-panel. The unit is cut at the unwelded portions to provide several sub-panels which are assembled to form the heat exchange panels. The metal sheet may be bent during manufacture of the unit to provide sub-panels having stiffening ribs or having projections for interlocking adjacent sub-panels.

Abstract: Methods for manufacturing heat exchange panels each comprising metal tubes of finite length welded to a metal sheet except at the end portions of the tubes which are secured to headers in fluid-tight relation thereto, in which methods the metal sheet, having end edges and side edges, is formed into a hollow cylinder with the end edges adjacent each other and metal tubing is welded to the cylinder in a spiral path. Welding is interrupted adjacent the end edges and the tubing is cut above the end edges to provide tubes welded to the cylinder except at end portions of the tubes. The end portions of the tubes, after the cylinder-tube combination is formed to the desired shape, e.g., flat, are secured to the headers. If tubes parallel to the side edges of the sheet are desired, the hollow cylinder is formed with adjacent portions of the side edges in axially offset relation prior to welding the tubing to the cylinder.