Abstract: A new anchoring mechanism for the mold-crucible set to the tube, to which the cable is to be welded is described, and the inclusion and use of some bushings which are inserted between the cable and the mold.

Abstract: An ignition source system for an exothermic reaction mold device for welding conductors. The system includes a crucible in a block with an open top so that the crucible receives an exothermic weld material. The conductors to be welded exothermically are placed in the weld cavity of the mold. A lid covers the open top wherein the lid has an opening therethrough. An electronic thermal igniter assembly has an ignition component receivable through the opening in the lid so that the exothermic weld material may be ignited by the electronic thermal igniter assembly. The igniter plug rests on top of the lid and the ignition body is retained in a recess within the igniter plug.

Abstract: An ignition source system for an exothermic reaction mold device for welding conductors. The system includes a crucible in a block with an open top so that the crucible receives an exothermic weld material. The conductors to be welded exothermically are placed in the weld cavity of the mold. A lid covers the open top wherein the lid has an opening therethrough. An electronic thermal igniter assembly has an ignition component receivable through the opening in the lid so that the exothermic weld material may be ignited by the electronic thermal igniter assembly. The igniter plug rests on top of the lid and the ignition body is retained in a recess within the igniter plug.

Abstract: The invention relates to a device for igniting an aluminothermic composition, characterized in that it comprises an electric resistor for connecting two electrodes and to be supplied by an electric current source of in order to generate heat by a Joule effect, said electric resistor being exposed to a medium comprising oxygen and carbon so that the temperature rise of the medium by the resistor results in the formation of carbon monoxide, and then in an exothermal reaction of the latter with oxygen, thus generating a flame capable of igniting of the aluminothermic composition.

Abstract: A solid weld-metal-producing material is formed by agglomerating weld metal material powder. An igniter may be integrally formed in or on the agglomerated weld metal material. In addition to typical components of a weld metal material mixture, such as a reductant metal and a transition metal oxide, the agglomerated weld metal mixture may include a binder material, such as sodium silicate. In addition to functioning as a binder to help hold the agglomerated weld metal material together, the binder material may aid in the exothermic reaction that occurs when the weld metal material is ignited. The agglomerated weld metal material may be made by mixing together a reductant metal powder, a transition metal oxide powder, and possibly a binder solution. A slurry of the components may be pressed together, for example, using a die and a ram, and then may be dried.

Abstract: Method and device to join the ends of two cylindrical objects by welding at deep water without the use of divers, where the ends of the two objects are connected with an inner casing inside an outer casing thereby creating a closed chamber around the joint between the inner and outer casings, evacuating the chamber and initiating a thermite welding process, the closed chamber thereby being filled with metal and establishing a mould sealingly connected with the outer surface of the two objects and abridging the distance between the two objects.

Abstract: A mold for joining conductors such as stranded cable to each other and to other elements such as a ground rod is formed of two or more parts. The mold formed by the parts includes a weld chamber. Exothermic welding material in a crucible above forms molten metal which drops into the weld chamber through a tap hole. The mold includes sleeving passages extending upwardly at an angle from horizontal to exit the mold well above the level of molten metal forming the weld. The sleeving passages extending upwardly at an angle from the weld chamber, or as a V with two symmetrical passages, are preferably larger than normal passages and accordingly will accommodate a wide variety of cable sizes without interference with or abrasion of the sleeving passages. This enables one mold to accommodate more sizes, avoids the use of packing, adapter sleeves or shims, and maintains the weld chamber well vented.

Abstract: In order to reduce the residual stresses which occur in the region of a fusion weld of two rail ends (1,2), in order to reduce, in particular to make uniform, the cooling-down rate and--associated with this--the crystallization process within the solidifying weld material, a casting mold is proposed which is equipped with a system of risers (9) and air vents (10) which are designed symmetrically with respect to a longitudinal center plane (5) and a transverse center plane (3) of the welded joint, the risers (9) and the air vents (10) being physically distributed as a function of geometric parameters of the rail foot (8) and of the weld bead (4), and the cross sections of the air vents (10) being dimensioned as a function of the cross sections of the risers (9).

Abstract: Disclosed is a method for the aluminothermal production of molten steel for the aluminothermal welding of workpieces, wherein the aluminothermal reaction is carried out in a crucible made of porous or hollow spherical .alpha.-Al.sub.2 O.sub.3 with a density of 0.8-3.0 g/cm.sup.3 and a bulk density of 0.3-1.8 g/cm.sup.3.

Abstract: An exothermic welding jig, molds for the jig, and a method of forming and manipulating the mold parts is disclosed. Upper and lower mold parts are included with a crucible fitted on and clamped to the upper mold part. The upper mold part and crucible may be moved as a unit to open and close the mold and also inverted when open for cleaning and inspection. The crucible can quickly be removed or snapped in place for mold or crucible change out. The jig will fit in cramped quarters and has a handle which may be used as a cane or supporting device. A toggle opens and closes the mold set and will hold the molds at any position where released. A mold system with diagonal sleeving makes it easier to form X-connections and other connections in tight or restrictive locations. The method includes the attachment and manipulative steps.

Abstract: An exothermic welding apparatus and method uses a crucible which can be used with a variety of exothermic weld metal material volumes to produce welds of different sizes while maintaining the desired diameter to height ratio for each volume of exothermic material. In one embodiment, the crucible includes a double or two stage cavity. The crucible includes a somewhat smaller lower stage which reduces the diameter for smaller volumes. This lower stage may have two disk seats to isolate the two stages from the tap hole. A disk seat is provided for a larger disk between the two stages. The crucible may include a volume of exothermic material in the smaller lower chamber, the larger upper chamber, or a combination of both. In a triple stage embodiment, a wider variety of exothermic material volumes or masses may be accommodated, all while maintaining the desired diameter to height ratio for each charge. Although the desired ratio is approximately one, the ratio range should be maintained from about 0.5 to about 1.

Abstract: Exothermic welding apparatus includes a toggle frame jig for supporting vertically split molds. The toggle includes a post projecting parallel to the main pivot of the jig on which telescopes a crucible support. The crucible support includes a handle extending above the crucible when secured to the support. A quick acting toggle connects the support and post enabling the crucible to be assembled, cleaned, or prepared remote from the molds and then quickly installed and locked in position.

Abstract: The disclosure relates to a multi-part mold for aluminothermic welding without preheating of metal parts, said mold having internally employed a welding cavity and two rising channels with variable cross-sections along their height, the central part of welding cavity being located below with respect to the lateral parts of welding cavity, said welding cavity having an increased moment of inertia of cross-section and an increased height from the lower side of base portion of welding cavity to the neutral axis of welding cavity, said rising channels extending from a region lower than said base portion, said welding cavity and said rising channels being connected together through two connecting ducts extending from the lower side of base portion to the head portion of welding cavity, the invention further relating to a process of reaching the metal parts by the liquid steel first underneath the lower side of base, a process of creating a liquid bath of constant height in an early stage of pouring operation and t

Abstract: In the heat treatment in the field of a thermite weld between rail ends, the rail ends and the weld are enclosed within a containment filled with an aluminothermic material mixture. The mixture is ignited and the rail ends and the thermite weld are heat-treated for a given period. After the given period, the aluminothermic reaction products and the containment are removed, and an air quench unit is placed about the weld and rail ends and compressed air is directed at the weld and rail ends for a given time period. After the removal of the air quench unit, the weld is allowed to cool to ambient temperature.

Abstract: An improved thermite reaction containment vessel and method of using the same includes a crucible in which the exothermic material is contained and which is connected at its lower end via a tap hole to a weld chamber in which the parts to be welded are positioned. On top of the crucible is positioned a baffle assembly which includes a plurality of expansion chambers which allows the escaping gas to expand and be reduced in velocity. As the gases move from one expansion chamber to the next the gases change direction. The expansion, direction change and the large surface area of the baffle assembly allows the gases to slow and cool before being exhausted leaving behind molten metal spatter or flame and greatly reducing the amount of smoke exhausted since particulate matter is accumulated on the baffle interior surface. Several forms of baffle assembly are disclosed using inverted stacked metal cups.

Abstract: A self-opening closure for the discharge aperture of a crucible containing an aluminothermic mixture for welding, the closure comprising a pellet of a solid, e.g. asbestos, having good mechanical resistance and which is not degassed by heating, a thermal conductivity below 2 kcal/m.h. .degree. C. and a fusion temperature below 1600.degree. C. The discharge aperture is formed in a detachable socket, one end of the discharge aperture having a part with a greater diameter to receive the pellet which forms the closure.

Abstract: The invention relates to an automatic unplugging aluminothermic welding crucible comprising a crucible per se made of refractory material, shaped generally as a truncated cone with a vertical axis, said cone tapering inwardly to the lower base thereof and comprising a conical hole receiving a crown provided with a conical bore, said conical bore receiving a casting socket, the conduit thereof being sealed by sealing means before filling of said crucible, said sealing means comprising a plug made of an aluminothermic compound consisting of iron oxide and aluminum agglomerated with a suitable binder, said plug resting on a steel washer.According to the invention, said sealing means comprise a plug made of an aluminothermic compound consisting of iron oxide and aluminum agglomerated with a suitable binder, for example, made of silicate.