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A 496 material is the correct designation for the material used by the Nelson arc welding machines.
A 706 material would be acceptable for use, in lieu of A 496, if the contractor intended on providing all-around fillet welds to the structural steel (be prepared to give them an appropriate weld thickness schedule, and don't forget the visual inspection).  Fillet welds work up to #6 or somewhere in there before your cross sectional area to circumference ratio makes it impossible to connect with fillet welds.
If you're on a small job, contractors sometimes seem to opt for welding the bars themselves rather than bringing in the specialty equipment for the DBAs.
A 518?  From what I see this is an iron casting designation.

Jason Christensen <jason(--nospam--at)> wrote:
Anyone know what the current ASTM designation for DBA (deformed bar anchor) is?
I have some shops coming in specifing A496, another set specifing A706 weldable rebar, and another set with A518. 
Just wonding what I should be specifing for just a general application?

Benjamin H. Maxwell, S.E.

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