[TowerTalk] Tack welding rebar, need howto

[Roger (K8RI) on TT]

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.


73

Roger (K8RI)



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