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Uranium glass used as lead-in seals in a vacuum capacitor. Glass-to-metal seals are a type of mechanical seal which joins glass and metal surfaces. They are very important elements in the construction of vacuum tubes, electric discharge tubes, incandescent light bulbs, glass-encapsulated semiconductor diodes, reed switches, glass windows in metal cases, and metal or ceramic packages of ...
The bonding between the glass or ceramics and the glass solder can be either covalent, or, more often, van der Waals. [12] The seal can be leak-tight; glass soldering is frequently used in vacuum technology. Glass solders can be also used as sealants; a vitreous enamel coating on iron lowered its permeability to hydrogen 10 times. [13]
Came glasswork includes assembling pieces of cut and possibly painted glass using came sections. The joints where the came meet are soldered to bind the sections. When all of the glass pieces have been put within came and a border put around the entire work, pieces are cemented and supported as needed. [1]
When the brazing temperature is suitably high, brazing and heat treatment can be done in a single operation simultaneously. Eutectic alloys melt at single temperature, without mushy region. Eutectic alloys have superior spreading; non-eutectics in the mushy region have high viscosity and at the same time attack the base metal, with ...
The benefits of crimping over soldering and wire wrapping include: A well-engineered and well-executed crimp is designed to be gas-tight, which prevents oxygen and moisture from reaching the metals (which are often different metals) and causing corrosion; Because no alloy is used (as in solder) the joint is mechanically stronger [6]
[1] [2] A weak bond can also be achieved at room temperature. [3] Diffusion bonding is usually implemented by applying high pressure, in conjunction with necessarily high temperature, to the materials to be welded; the technique is most commonly used to weld "sandwiches" of alternating layers of thin metal foil, and metal wires or filaments. [ 4 ]
Attachments can be made vertically, horizontally or even overhead. If preferred, threaded pins with nuts can be attached or cable bonded directly onto the pipe by means of a special cable lug which can be crimped on site or supplied complete as a unique integrally crimped attachment. The pin brazing unit contains all the equipment and tools ...
This can be calculated in kW (kilowatts), but more usefully for cost benefit calculations can be stated as kWh pa (kilowatt hours per annum), based on the typical conditions over a year for a given location. The glass panels in double-glazed windows transmit heat in both directions by radiation, through the glazing by conduction and across the ...