[TowerTalk] Tack welding rebar, need howto (was: Tower Foundation (was Concrete Prices)

[Patrick Greenlee]

Rick, Is it safe to assume (yeah, I know how to humorously dissect the word) 
that tack welds at the ends of lengths of rebar to hold things in place 
would not particularly cause a problem with strength reduction.  This of 
course world be an entirely different thing if you were welding a length of 
rebar mid span.  Tensile strength is important and you don't want to make 
the rebar easy to stretch as that would defeat its purpose.

What say, Rick?  Ok to weld the ends of rebar to the ends of other pieces.

Patrick NJ5G

-----Original Message----- 
From: Rex Turvin
Sent: Thursday, January 02, 2014 6:03 PM
To: Richard (Rick) Karlquist
Cc: towertalk at contesting.com ; Grant Saviers
Subject: Re: [TowerTalk] Tack welding rebar, need howto (was: Tower 
Foundation (was Concrete Prices)

Rick
Speaking as a certified welder, technically speaking you are suppose to use 
the higher grade rebar when welding it as the normal rebar looses a lot of 
strength when heated.
I am also required to use 80 series rod (80,000psi) for rebar. That is why 
it is so expensive to do when welding.
I personally like to weld my cages it prevents movement. If you use a wire 
welder either solid wire or flux core it also it suppose to be a 80 series 
per welding codes
73 NR6M

Sent from my iPhone

> On Jan 2, 2014, at 3:27 PM, "Richard (Rick) Karlquist" 
> <richard at karlquist.com> 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.
>
> 2.  Gas weld or arc weld?  How big of an arc welder needed?
> Can I get away with a MAPP gas torch?
>
> 3.  What welding rods to use?
>
> 4.  What if the bolts happen to be galvanized?  Grind
> off the galvanizing near the weld?
>
> 5.  Can this be done by a novice welder?  (I took a
> class on welding in college 40 years ago, so I know
> just enough to be dangerous).  Any stupid rookie
> mistakes to avoid?
>
> 6.  Alternately, if I go to a welding shop, are they
> going to know what to do or do I need to go to a
> concrete company that makes rebar cages all the time?
>
> 7.  I am mainly interested in using tack welding to keep
> the bolts from moving.  The jury is still out on whether
> to weld or wire the rest of the cage.  I just don't
> trust wiring as being rigid enough to fix the bolts
> in place.
>
> Thanks in advance.
>
> Rick N6RK
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