[TowerTalk] Tack welding rebar, need howto

Jim Lux jimlux at earthlink.net
Fri Jan 3 17:13:52 EST 2014

On 1/3/14 12:05 PM, David Gilbert wrote:
> By the way, while I totally understand why you'd want to tack weld the
> bolts to the rebar, I've never thought much of welded rebar cages in
> general.  True weldable rebar (the stuff that is supposed to hold it's
> strength after welding) is expensive and harder to get.  The 40,000 PSI
> stuff you can get at Lowes and Home Depot comes from indeterminate
> source material (a mixture of washing machine chassis, old bed springs,
> car frames, salvaged rebar, etc) and almost certainly will not weld with
> consistent strength, although you can buy better 60,000 PSI stuff from
> construction supply places.

Yeah, but if you're using rebar from who knows what kind of metal, are 
you really concerned about whether it retains the strength when you weld it?

As I recall, about as weak as steel gets is 30-40 ksi.. Unless your 
welding physically damages the steel, I don't know how much lower you 
can go.

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