[TowerTalk] Rebar Cage Question

[jimlux]

Donald Chester wrote:
> I have heard it said many times that one should not weld the rebar
> cage together, but tie it together using tie wires.  But I have never
> heard any explanation of why.
> 
> What problems would be caused by welding?  I can't see how such a
> minor detail would make any significant difference, but a welded cage
> is certainly easier to handle before the concrete is poured in, and
> less likely to fall apart just as the  concrete is being dumped.

The metal that the rebar is made of is not of the most consistent 
composition, so it's tough to get a consistent welding process that 
doesn't actually weaken the metal. Rebar is welded, but you need the 
right kind of rebar and the right kind of rods and the right kind of 
welding.  Just grabbing up a torch and sticking it together doesn't work.

Properly wired, it should hold together just fine during the pour.

It's a cost thing, too.  Wire and the usual random composition rebar and 
a worker to do the ties is cheaper than controlled composition rebar 
with certs and a certified welder and their gear.

Jim