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Re: [TowerTalk] Welding rebar

To: "Red" <>,"TowerTalk" <>
Subject: Re: [TowerTalk] Welding rebar
From: "K8RI on Tower talk" <>
Date: Mon, 30 Jan 2006 16:00:11 -0500
List-post: <>
I can't find it now, but it seems like I read some where in "the book" while 
installing my tower, not to weld the rebar for the tower foundation.  Maybe 
it's just a faulty memory.

Roger Halstead (K8RI and ARRL 40 year Life Member)
N833R - World's oldest Debonair CD-2

Following is information I received from Hank Lonberg, S.E.,P.E. / KR7X,
Lonberg Design Group about rebar grades and welding.

73 de WOØW

Here is a url to a PDF from the CRSI (concrete
reinforcing steel institute) that may be of some
assistance. On the second, I think, page of 8 pages it
starts to talk about welding reinforcing steel and A706
and  A615 grade 60 bars.

I reviewed my D1.4 AWS Welding Code -Reinforcing Steel
and the following electrodes are recommended:

A615 grade 60 -- E90xx
A706          -- E80xx

Sorry about that.


> Hank Lonberg wrote:
> >Red:
> >
> >The 60 grade and 40 grade are in reference to the yield stress of the
> >bar with 60 being 60,000 psi and 40 being 40,000 psi. I am also
> >curious,as 40 grade is not a readily available grade anymore and hasn't
> >been for quite awhile. I wonder if your suppliers are using import
> >material. Are your suppliers reputable or are they used or surplus
> >yards? Just a question don't take it the wrong way.
> >
> >As to the welding, use A706 bar or preheat the 60 and 40 grade to 300
> >degrees F prior to welding or risk losing 1/2 or more of the bar
> >strength. Use E70xx electrodes. It's Your choice.
> >
> >Good luck
> >
> >Hank Lonberg, S.E.,P.E. / KR7X
> >Lonberg Design Group


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