A cover unit for hermetically sealing a container for a semiconductor device comprises a rectangular metallic cover element such as a cobalt-nickel-iron alloy and a plurality of contiguous turns of wire of a heat-fusible material such as a gold-tin eutectic alloy formed and disposed on the cover element with the outermost turn substantially in registry with the periphery thereof, said turns being spot-welded thereto substantially at the corners of the cover element. The preferred method of fabri...

A method is provided for the explosive welding together of sections of large diameter metal pipe of the kind used in the construction of high volume oil and gas pipelines. In the method, internal and external band charges of welding explosive are simultaneously detonated adjacent to overlapped telescoped pipe ends. The welding charges are detonated simultaneously by means of very high detonation velocity initiation explosive charges placed along a leading edge of each welding explosive charge. T...

A method of installing a sleeve within an vortex finder of a cyclone separator to adjust the diameter of the vortex setting. To facilitate installation of the sleeve, the dish-shaped bottom of the cyclone is mounted on a plate which can be lowered and then pivoted aside. The sleeve is provided with a collar which is stitch welded to the bottom of the vortex finder to retain the sleeve in place. Alternatively, the collar and vortex finder are provided with a bayonet joint to releasably retain the...

A layer head or shell for a pressure vessel is formed by building up successive wraps over a liner, each wrap consisting of a plurality of segments which fit together such that the wrap completely covers the liner or the wrap immediately under it. Each segment is curved to conform to the surface over which it is installed, and once in place a seal is provided along its periphery. Air is evacuated from the space between the wrap segment and the underlying surface so that air at atmospheric pressu...

A muffler comprising: a cylindrical body closed at opposite ends with end members; an exhaust gas in-flow tube penetrating and secured to one of the end members; an exhaust gas out-flow tube penetrating and secured to the other end member; and at least one perforated partition wall member for supporting both the tubes and dividing the interior of the body; the exhaust gas in-flow tube at least having an end portion of an inner diameter smaller than the inner diameter of an exhaust tube connected...

Thermocompression methods of forming sodium-sulfur cell casings are described. One method includes positioning an assembly within a die, the assembly having an inward flange at one end of an open ended metallic container positioned against an aluminum washer adjacent each opposite major surface of an electrically insulating ceramic ring, applying pressure to each flange within its respective container, and heating the assembly in an inert atmosphere to bond the containers to the ceramic ring. An...

A method of applying a surface layer across a surface layer or joint between cladding layers on a clad metal plate or plates comprises forming a shallow chamfer along each opposing cladding layer edge and positioning over the said chamfers a corrosion resistant metal flyer-plate having a shallow generally V-shaped configuration, optionally applying a buffer layer of transmitting medium placed on the outside surface of the flyer-plate, further superimposing an explosive layer upon the cladding an...

A method and a device for controlling operating processes applied to particles. The device comprises a number of operating stations, such as, lifting- and sluing conveyors to allow for feeding the particles to an indexing rotary plate and conveying of particles to a processing stage, e.g. a welding device. The operating processes of the operating stations are initiated according to a common, pre-set cycle, at least one of the operating stations is associated with a correcting process initiated b...

The invention overcomes the difficulty of applying a layer of material e.g. braze material, to a concave surface, by rotating the workpiece having the concave surface, about the axis of revolution of the concavity and the material is applied thereto in powder form and held by centrifugal force. Before stopping rotation, a liquid binder is applied to the material and allowed to set, so as to make the resulting mixture self supporting.

A method is provided for the explosive welding together of sections of large diameter metal pipe of the kind used in the construction of high volume oil and gas pipelines. In the method, internal and external band charges of welding explosive are simultaneously detonated adjacent to overlapped telescoped pipe ends. The welding charges are detonated simultaneously by means of very high detonation velocity initiation explosive charges placed along a leading edge of each welding explosive charge. T...