[TowerTalk] Welding rebar

[Red]

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.

 http://www.crsi.org/PDF/edr_44.pdf

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.

73
Hank


> 
> 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