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Do you know if carbon equivalency was determined in advance for the rebar
and "proper" welding procedures were used in this incident?  

> -----Original Message-----
> From: Christopher Wright [mailto:chrisw(--nospam--at)]
> Sent: Monday, November 08, 1999 7:45 PM
> To: seaint(--nospam--at)
> Subject: RE: REBARS : ASTM A 615 GRADE 60
> >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)