Abstract:
A self−contained crucible assembly for forming a weld between a pair of metal articles, includes a container with side walls and a fusible bottom, a refractory material lining the side walls, an exothermic weld material within the container, an ignitor partially within or close to the weld material and partially external to the container, and a cover sealing the weld material. The ignitor may be stiffened to maintain its shape, and keep it in a desired position relative to the exothermic weld material. The crucible assembly is configured to be placed on mold having a chamber therein. Upon ignition of the weld material via actuation of the ignitor, the weld mateiral reacts exothermically to produce molten weld metal and slag. The fusible bottom of the container is melted by the liquified molten metal, and the weld material flows into a weld chamber of the mold to produce the weld.
Abstract:
A system (100) and method of welding is provided where a first welding power supply provides a first welding waveform to a strip electrode (101) for welding a work piece (W) and a second welding power supply provides a second welding waveform to at least one curtain electrode (107, 113) for welding the work piece (W). The at least one curtain electrode (107, 113) is positioned adjacent to a side of said strip electrode (101) during welding.
Abstract:
An ignitable solid material includes molten-metal-producing materials, as well as other mateirals for retaining its shape when ignited. The molten-metal-producing materials may include a metal-producing reaction mixture, for example including a reaction mixture comprising a reducing agent and a metal compound powder. The other materials may include a binder, and a heat-retaining material, such as sand. The ingredients of the ignitable solid material may be pressed together and dried, to produce a solid, machinable, heat-producing material (a heat block) that may be ormed in any of a variety of shapes. An insulating material, such as a ceramic blanket material, may be placed on one or more sides of the ignitable solid material, for example to direct heat produced by the reaction of the solid material in one or more desired directions. The solid material may be used in any of a variety of situations where concentrated heat is desired.
Abstract:
An automatic rail welding method wherein the welding at the bottom of a rail is conducted by uranami-welding first layer by a CO2 gas shield arc welding method; the welding at the second and subsequent layers is conducted continuously in layers by the CO2 gas shield arc welding method without interruption; the welding at an ankle portion (R2) of the rail is conducted by adding flux quickly and swichting over the welding method rapidly to electroslag welding; and the welding of up to the top surface (R5) is conducted similarly by electroslag welding. By this automatic welding method, welding of the rails at the site can be highly efficiently carried out without necessitating complicated power source switching operations and with no use of a plurality of types of welding materials.
Abstract:
A canister for storing radioactive materials includes a base plate, side wall and a top plate. The top plate includes a top surface with a top edge having a bevel, and with a channel set in from the top edge. The top plate is sealed to the sidewall by a weld formed between the beveled top edge and the top of the side wail. The base plate is sealed to a bottom of the sidewall, so that a sealed vessel is formed.
Abstract:
A weld ignition system (100) includes a wireless receiver (108) that wirelessly receives a weld ignition activation signal. The weld ignition system further includes igniter (110) that ignites a weld ignition material in response to the wireless receiver (108) wirelessly receiving the weld ignition activation signal. The ignited weld ignition material initiates exothermic based welding of a weld material.
Abstract:
A system for narrow-gap electroslag-welded moment connections welded between vertical column flanges includes vertical column doubler plates with top and bottom stiffeners and horizontal beam side plates aligned with the doubier plates to carry the moment load through the vertical support columns. An embodiment includes an elliptical radius in each side plate. Disclosure of an automated modular method for narrow-gap electroslag-welded moment connections is included.
Abstract:
The invention is a consumable guide tube (249) comprising a thin first elongated strip, a second elongated strip and a plurality of insulators. The thin first elongated strip has a front face and a back face and the front face has at least one longitudinal channel. The second elongated strip has a front face and a back face and the front face of the second elongated strip is configured to be coupled to the front face of the thin first elongated strip. The plurality of insulator modules are deposited on the back face of the thin first elongated strip and on the back face of the second elongated strip. Preferably, the thin first elongated strip is a low carbon cold rolled steel strip, and the second elongated strip is a low carbon hot rolled steel strip. The guide tube (249) can also be configured to comprise two or more longitudinal channels.