[TowerTalk] Tack welding rebar, need howto
Roger (K8RI) on TT
K8RI-on-TowerTalk at tm.net
Thu Jan 2 20:45:14 EST 2014
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.
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