[TowerTalk] Tack welding rebar, need howto

EZ Rhino EZRhino at fastmovers.biz
Thu Jan 2 23:42:46 EST 2014

Flux core for outdoors (read: wind), gas in the shop.  Don't try to oxy/acetylene weld it as the heat is much greater than a quick BZZT! tack from a MIG gun. 

I agree with about all the welding tips presented here, except that this probably isn't the "first project" you'd want to do if you have no prior experience welding.  Get someone to do it for you or stand next to you to tell you what to do if you still want to give it a go.  

Also, wiring a cage together is the traditional and least expensive way, although you'll need a helper to hold things for you while you twist n' cut.  Get eight more #4 rebars to use as diagonals to keep the thing square while you're building it so it doesn't turn into a parallelogram.


On Jan 2, 2014, at 18:45 , Roger (K8RI) on TT wrote:

On 1/2/2014 6:19 PM, Grant Saviers wrote:
> On 1/2/2014 2:27 PM, Richard (Rick) Karlquist wrote:
>> On 1/2/2014 11:02 AM, Grant Saviers wrote:
>>> Tack weld the bolts together with #3 rebar when attached to the base so
>>> they don't move when set without the base to make concrete work easier.
>>> Grant KZ1W
>> Can anyone refer me to a Dummy's guide to welding rebar?
>> 1.  I have heard that I have to use special weldable rebar.
>> What do I ask for?  I'm assuming that the common rebar
>> at Home Depot, etc is not it.
> That depends on your view of how strong the rebar in a tower foundation really needs to be.  All are weldable, it is how much the welding affects the heat treating and thus the yield strength.  HD rebar might be ungraded or grade 40, 40ksi yield and A706 is the official weldable rebar.  I think it is pretty common to weld up common rebar, and it might reduce the yield strength by 15 to 20%.
>> 2.  Gas weld or arc weld?  How big of an arc welder needed?
>> Can I get away with a MAPP gas torch?
> A 120v 130amp MIG or bigger with flux core wire will work,

Why flux core.  MIG uses a cover gas and I don't see the flux serving a purpose with steel?
Rerod's main function is to keep the concrete from breaking.


Roger (K8RI)

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