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JP2008110399A |
To provide a method of manufacturing an electric resistance welded tube excellent in the properties of a weld zone by which toughness of the weld zone required for the electric resistance welded tube for line pipes of an oil well and str...
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JP2008105061A |
To provide a method for manufacturing an electric resistance welded tube having excellent characteristic of a weld zone capable of achieving the toughness of the weld zone requested for the electric resistance welded tube intended for a ...
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JP2008105063A |
To provide a manufacturing method of an electric welded tube having excellent characteristic of a weld zone capable of achieving the toughness of the weld zone requested for the electric welded tube intended for a line pipe of an oil wel...
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JP2008105075A |
To provide a method for manufacturing an electric resistance welded tube having excellent characteristic of a weld zone capable of keeping the excellent welding quality by making an end of a plate before the electric resistance welding h...
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JP2008100277A |
To provide a method for producing a thick electric resistance welded pipe by which the toughness of a weld zone is improved, and a yield ratio is reduced without performing any heat treatment.Using a hoop having a composition comprising,...
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JP4081910B2 |
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JP2008087022A |
To provide a method for manufacturing a seam welded pipe having excellent characteristics of a welded portion, which method can surely and sufficiently improve characteristics (especially low temperature toughness) of a welded portion.Du...
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JP2008087020A |
To provide a method of manufacturing an electric resistance welded tube excellent in weld zone characteristics, by which the weld zone characteristics (low temperature toughness particularly) can surely anf sufficiently be enhanced.In th...
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JP2008087021A |
To provide a method for manufacturing a seam welded pipe having excellent characteristics of a welded portion, which method can achieve the toughness of the welded portion necessary for the seam welded pipe for a line pipe for an oil wel...
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JP2008080358A |
To provide a method and an apparatus for detecting the position of the seam of a seam welded pipe, by which method and apparatus, the position of the seam can be robustly (stably) detected without the erroneous detection due to the chang...
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JP2008080390A |
To provide a method for producing an electric resistance welded tube having satisfactory weld zone characteristics capable of satisfactorily maintaining welding quality, when producing an electric resistance welded tube, by suitably impa...
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JP2008055505A |
To provide a planar one turn coil for electromagnetic welding as a planar one turn coil for applying electromagnetic welding to thin metal sheets, by eliminating such a defect that the conventional planar coil that, upon welding of alumi...
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JP4060604B2 |
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JP2008030114A |
To provide a method of manufacturing an electric resistance welded tube with excellent weld part characteristic capable of maintaining excellent weld quality by providing a proper taper shape to the end part of a plate (a band material) ...
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JP2008503349A |
A cold roll forming mill for the manufacture of hollow flange seam welded beams from a single strip of metal comprises a forming station (1), a seam guide and welding station (2) and a shaping station (3). Either or both of the forming a...
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JP2008012582A |
To provide a method for manufacturing an electric resistance welded tube having excellent weld characteristics, which method surely and sufficiently improves weld characteristics (particularly, low temperature toughness).During a step of...
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JP2008012581A |
To provide a method for manufacturing an electric resistance welded tube having excellent weld characteristics, which method sufficiently facilitates discharge of defects, such as an oxide, accompanying discharge of molten metal.In the m...
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JP2007330983A |
To provide a method for manufacturing an electric resistance welded tube having excellent weld characteristic capable of maintaining excellent welding quality by adequately giving a tapered shape to an end of a plate (a strip) before the...
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JP4028861B2 |
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JP4024119B2 |
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JP2007319869A |
To provide a highly efficient method of producing an electric resistance welded tube having good weld zone characteristics by which discharge of defects such as oxides resulting from discharge of molten steel can be sufficiently promoted...
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JP2007307607A |
To provide a method of manufacturing an electric resistance welded tube which is excellent in the properties of a weld zone by which the properties of the weld zone (especially low-temperature toughness) can be improved surely than a con...
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JP2007307566A |
To provide a method for producing an electric resistance welded tube for a high-strength thick line pipe having high weld zone toughness in which the weld zone is not embrittled and fractured even when being laid in a cold district. The ...
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JP4013266B2 |
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JP2007305555A |
To provide a flat multiple-winding coil for electromagnetic welding or electromagnetic molding composed by improving a drawback of a conventional flat coil that its power energy transfer efficiency is low although it has mechanical stren...
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JP4010880B2 |
To conduct stable control by making speed of response uniform by changing forward gain of closed-loop control even if a heat capacity of a substance-to-be-heated is different. This device is equipped with the substance-to-be-heated (a st...
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JP2007296538A |
To provide a method of manufacturing an electric resistance welded tube excellent in weld zone characteristic by which the good quality of welding can be held by appropriately imparting tapered shapes to the end parts of a sheet (band ma...
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JP2007254797A |
To provide a thick electric resistance welded pipe having excellent strength and low temperature toughness in the base metal part and the electric resistance weld zone required as those of a high-pressure line pipe for cold districts, an...
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JP2007229755A |
To efficiently perform a submerged repair with a patch for welding the patch to a structure after placing the patch on a defective surface portion of the structure in a submerged state. An apparatus for submerged repair with a patch comp...
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JP2007222898A |
To provide an economical device for treating bead chips on an inner surface which is free from any trouble. The device comprises a tube-receiving stand 13 for horizontally holding a plurality of electric welded steel tubes P with one end...
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JP2007524511A |
An apparatus for performing a plurality of magnetic pulse forming or welding operations includes a power supply, a plurality of inductors, and a power distribution system for selectively connecting the power supply to each of the plurali...
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JP3966502B2 |
To provide a discharge gap switch-incorporated electromagnetic welding machine in which wiring resistance is decreased by shortening the distance between a coil and a capacitor and the entire electromagnetic welding machine is miniaturiz...
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JP2007210026A |
To provide an impeder core which can make a welding efficiency stable. The impeder core 9 comprises seven ferrite cores 21. Each ferrite core 21 is rodlike and has a dodecagonal cross-section perpendicular to its longitudinal direction. ...
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JP3960072B2 |
To control an input current in a sine wave form, pass a current to a heating coil from an alternating current through the minimum number of semiconductor elements, and do without storage of direct current by obtaining high-frequency alte...
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JP3947615B2 |
To surely prevent a weld zone from being oxidized. When an electric resistance welded tube P is manufactured by an induction heating method, a squeeze roll R for pressure welding a weld zone of the electric resistance welded tube P and a...
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JP3946555B2 |
To provide a web edge preupset method which forms a large-thickness part at the end of a web in its widthwise direction to be welded to a flange without buckling distortion of the web end. In welding the web to the flange to prepare an H...
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JP3942082B2 |
To provide a single-sided coil type electromagnetic welder in which mounting or demounting operation of a material to be welded is facilitated and limits in a size and a shape of the material are reduced. The single-sided coil type elect...
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JP3942081B2 |
To provide an upper and lower split coil type electromagnetic welding machine capable of welding a work having long welding length by enlarging the work space without increasing inductance of a discharge circuit. The coil for feeding a w...
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JP2007160325A |
To provide an electric resistance welded tube having excellent brittle fracture resistance occurrence characteristic and capable of obtaining the excellent a CTOD (Critical Crack Opening Displacement) value.A bond part in a section in th...
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JP3937369B2 |
To provide a method for working a ferritic stainless steel pipe less prone to brittle cracks. A ferritic stainless steel contg., by mass, ≤0.03% C, ≤2.0% Si, ≤2.0% Mn, 10.0 to 35.0% Cr and ≤0.03% N, furthermore contg. one or more...
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JP3938918B2 |
The invention relates to a method for changing sets of top rolls, lateral rolls, and a bottom roll, and mounted in chocks of a welding stand of a continuously operating longitudinal tube welding machine. The inventive method enables the ...
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JP3938242B2 |
To provide a squeezing device, which can carry out side roll driving, side roll opening/closing, and water cooling of the inside of the roll at the same time, and further can reduce the holding cost of the devices to be equipped for ever...
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JP2007516351A |
A welded low carbon dual phase (ferrite plus martensite) and/or low carbon martensitic stainless steel PIPE having requisite yield strength and corrosion and/or erosion resistance is shown. Pipe can be manufactured up to a maximum outsid...
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JP2007144515A |
To provide a method and system for monitoring and controlling at least one of the plurality of quantifiable heat affected zones (HAZ) characteristics in a weld of metal pieces.The method for monitoring and controlling at least one of the...
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JP3898809B2 |
To provide the method for manufacturing a resistance welded steel tube excellent in formability and having high ductility by means of specific heat treatment. A steel strip, having a composition consisting of, by weight, 0.05-0.25% C, â‰...
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JP3890769B2 |
To enlarge the ratio of winding number and axial direction length of a work coil and improve welding efficiency by passing a tubular member in a work coil connected to a high frequency power supply, heating a V slit part of the tubular m...
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JP3879207B2 |
To provide a manufacturing method for a welded steel tube having high strength and high ductility capable of high efficiently producing and also coping with the many kinds-but-small lot production. A strip steel 1 which is rapidly cooled...
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JP3875766B2 |
To prevent the flow-out of molten material of rod-state of reinforcing iron overflowed from a concave part by arranging an 0-ring at one side or the other side of the concave part on the peripheral surface of an inner diameter at the cen...
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JP3876501B2 |
To control undulation of edge and to improve control of butting condition of the both edges of a metal strip by welding the edges butted to each other while the edges are pushed up to make a big circular in longitudinal direction with a ...
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JP2007007687A |
To provide a device for removing bead chips without lowering productivity.A device for removing bead chips on the inner surface of a pipe is arranged on a cooling bed, where a manufactured steel pipe is gradually fed in a traverse direct...
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