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The Molecule Counters, Part 2: More About Vacuum Gauges.
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By Daniel Herring.
Four, five, six, counting molecules is a job for vacuum gauges, and it’s now time to understand the differences between these devices and when to use them.
Recall first that the vacuum level in a vessel is determined by the pressure differential between the evacuated volume and the surrounding atmosphere (Table 1). The two basic reference points in all these measurements are standard atmospheric pressure (760 torr) and perfect vacuum (0 torr), so calculating changes in volume in vacuum systems requires conversions to negative pressure (psig) or absolute pressure (psia). READ MORE
Published with the permission of Industrial Heating Magazine
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Selecting Brazing Fixture Materials.
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By Dan Kay.
Which base-metal should I use for braze fixturing so that it will last the longest? This question is not an uncommon one. Although I have never personally seen any kind of chart showing an "expected life" for fixture materials, it is important that people understand that there are a number of factors that will control the "life expectancy" of any fixturing material used in brazing, and all of these factors relate to the service conditions that the fixtures will encounter during the brazing process. READ MORE
In August's article, I'll address the commonly used method of adding a lot of "dead weight" onto parts in an attempt to keep them flat during brazing!
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