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October 2008 |
905-827-4171 |
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Maintenance Procedures for Vacuum Furnaces Part 2 - Vacuum Seals
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During construction, all welded joints in a vacuum furnace are inspected for hermetic integrity and should remain intact for the life of the furnace.
However, there are also a number of demountable connections that can be separated and reconnected for component changing or repair access reasons. These connections are generally sealed with a gasket sandwiched between two flanges. Though different gasket materials are used depending on the vacuum level required, most seals in a standard vacuum furnace incorporate an o-ring made of natural or synthetic rubber. Buna-N, silicone and Viton o-rings are readily available in many sizes. READ MORE
This is the second in a series of four articles on Vacuum Furnace Maintenance. (Read Part 1) |
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Selection of Filler Metals For Vacuum Brazing - Part 2
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Brazing involves the joining of two or more base metal components by melting a thin layer of filler metal into the space between them.
Bonding results from the intimate contact produced by the dissolution of a small amount of base metal into the filler metal, without melting of the base metal. Brazing differs from welding, in which the joint is formed through melting of the base metal. Brazing is similar to soldering but, by definition, is performed at higher temperatures. In brazing, the filler metal can be placed within the joint as a foil, or placed over the joint in the form of paste or wire. Joint clearances must be very carefully controlled and usually do not exceed .12mm (.005"). Capillary action draws the molten filler metal into the joint and holds it there. The base metal components must be designed to enhance the capillary action. Brazing is a process that has been well adapted to vacuum heating methods. READ MORE
This is the second in a series of four articles on Vacuum Brazing Tecniques. (Read Part 1)
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