Effects of welding "Regular Grade 60 Rebar"

[MiguelPenaWSE]

Today at a job site, we encountered a problem.

Our firm designed Cast-In place concrete piles with grade60 rebar-cages, standard design.
Typically, the stirrups are tied with wire-ties to the vertical bars.
In this case, the contractor welded the stirrups to the vertical bars @ 6'-0" o.c. but did not use A706 weldable rebar.

I am trying to find any information regarding the problems or effects of welding regular grade60 rebar.

Thank you

 

[JStephen]

High carbon content can make it brittle.
As 'em for their weld procedures.

 

[msquared48]

If you showed tied and they welded without your permission, make the contractor do it per your design. Don't try to bail them out and take all of the responsibility in doing so.

Mike McCann
MMC Engineering

 

[EngineeringEric]

ACI 318-08, Building Code Requirements for Structural Concrete and Commentary. Section 3.5.2 of ACI 318-08 states that welding of reinforcing bars shall conform to AWS D1.4 and that type and location of welded splices and other required welding shall be indicated on the design drawings or in the project specs.

American Welding Society’s AWS D1.4 – Structural Welding Code – Reinforcing Steel details: This code requires that the carbon equivalent (C.E.) be calculated prior to welding.

The above information is directly quoted from the linked article (Footnote below)

It seems to me if welding was not stated then it should not have been preformed and if it was, i believe the welder needs special certification.

 

[fegenbush]

Please check AWS D1.4 which covers welding of rebar.

 

[MiguelPenaWSE]

Thank you very much for the replies.
We will reject the design.
Thank you