Understanding the Process of Cold Welding

In summary, the conversation discusses the process of cold welding in a vacuum chamber. The speaker explains that it is easy to achieve by cleaning the metal parts, applying pressure, and leaving them under vacuum for a few days. They also mention that using different types of metal or a coating of aluminum oxide or molbdenum disulfide can prevent cold welding. The article referenced in the conversation includes a quote from Feynman about the importance of understanding the basic principles of science.
  • #1
Crapsghetti
6
0
Can someone explain the process?
 
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  • #2
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.
 

1. What is cold welding?

Cold welding is a process in which two or more metal surfaces are joined together without the need for heat or pressure. It occurs naturally when two clean metal surfaces are brought into contact with each other in a vacuum or in a low-pressure environment.

2. How does cold welding occur?

Cold welding occurs due to a phenomenon known as "contact welding". When two clean metal surfaces are brought into contact, the atoms on the surface of each metal will bond together, forming a strong bond between the two surfaces.

3. What are the benefits of cold welding?

Cold welding offers several benefits, including a strong bond between the two surfaces, no need for additional materials such as adhesives or solder, and the ability to join dissimilar metals together. It is also a fast and efficient process.

4. What metals can be cold welded?

Cold welding can be used to join most types of metals, including aluminum, copper, steel, and titanium. However, it is not effective for welding non-metallic materials such as plastics or ceramics.

5. What are the applications of cold welding?

Cold welding has many applications in various industries, including aerospace, automotive, and electronics. It is commonly used for joining small electronic components, creating vacuum seals, and repairing metal parts.

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