MadSci Network: Physics
Query:

Subject: Why is welding necessary? Why don't atoms on surface of solids link up?

Date: Wed Aug 25 12:34:55 1999
Posted by No name entered.
Grade level: undergrad School: No school entered.
City: No city entered. State/Province: No state entered. Country: No country entered.
Area of science: Physics
ID: 935598895.Ph
Message:

Suppose I have two cubes of the same material, say gold for example.  
Suppose the pieces are each single crystal, with the same 
crystal orientations relative to the surfaces of the cubes.  Let us also 
suppose the surfaces are very flat.  If I now clean any oxides off the 
surfaces, and bring two surfaces together,why won't the two gold cubes
link together and become a single solid?  Shouldn't mutual attraction 
between atoms at surface of each cube pull the solid together?
 


Re: Why is welding necessary? Why don't atoms on surface of solids link up?

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