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>All rebar is weldable if you know the chemical properties
>and use the right procedures.

You might want to distinguish between melting two pieces of metal so they 
stick to each other and a sound metallurgical bond which allows the items 
to resist service loads in a safe, predictable fashion. Some years ago 
the distinction was made very clear in downtown Minneapolis when some 
'welded' rebar in a parking ramp let go and dropped a portion of the top 
floor right straight to the ground. Very graphic illuatration of why the 
pressure vessel and piping codes prohibit welding for steel with a carbon 
content above 0.35%.

Christopher Wright P.E.    |"They couldn't hit an elephant from
chrisw(--nospam--at)        | this distance"   (last words of Gen.
___________________________| John Sedgwick, Spotsylvania 1864)