Understanding the Process of Cold Welding

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SUMMARY

The process of cold welding occurs in a vacuum chamber at pressures around 10^-8 torr, where clean metal surfaces are brought into contact under pressure. This method is effective for metals of the same alloy, as cleanliness and pressure significantly enhance the bonding process. To prevent cold welding, materials such as aluminum, which quickly forms an oxide layer, or a combination of different metals should be used. Additionally, applying a light coating of molybdenum disulfide can act as a barrier to inhibit bonding.

PREREQUISITES
  • Understanding of vacuum chamber operations
  • Knowledge of metal alloys and their properties
  • Familiarity with surface cleaning techniques
  • Awareness of molybdenum disulfide applications
NEXT STEPS
  • Research vacuum chamber maintenance and operation
  • Study the properties of various metal alloys for cold welding
  • Learn effective surface cleaning methods for metals
  • Explore the use of molybdenum disulfide in industrial applications
USEFUL FOR

Engineers, materials scientists, and technicians involved in vacuum technology and metal fabrication will benefit from this discussion on cold welding processes.

Crapsghetti
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Can someone explain the process?
 
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See http://science.nasa.gov/science-news/science-at-nasa/2002/24oct_sunrings/

It's easy to cold weld stuff together in vacuum chamber at 10^-8 torr; just clean everything well so that the metal is clean, put the parts in contact with some pressure, and leave them under vacuum for a few days.

If they are made of the same alloy the may cold weld. The cleaner the quicker, and more pressure also helps.

Too avoid this use aluminum; the surface oxidizes so quickly that you will always have a layer of aluminum oxide. Or use two different metals. Or spread a light coating of molbdenum disulfide between them ... dry moly.

I've had this happen with my vacuum fixtures ... and learned my lessons! The article above has a good Feynman quote.
 

Thread 'Two equivalent statements of time reversal symmetric Hamiltonian'

Time reversal invariant Hamiltonians must satisfy ##[H,\Theta]=0## where ##\Theta## is time reversal operator. However, in some texts (for example see Many-body Quantum Theory in Condensed Matter Physics an introduction, HENRIK BRUUS and KARSTEN FLENSBERG, Corrected version: 14 January 2016, section 7.1.4) the time reversal invariant condition is introduced as ##H=H^*##. How these two conditions are identical?
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