Welding of Bent Rebar 1

[StuSE]

If I am welding a rebar with a 10 degree bend in it, onto a plate, how far away from the bend do I need to be, to start my weld? Does anyone know where I can find something in writing about this?

This diagram calls this dimension out to be 2 1/2" but I'm not sure where this dimension comes from.

Stu

 

[MechEng2005]

I'm not structural, so maybe I'm missing something, but I think more information would be needed to be any help. What are you concerned with? Strength after welding? Deformation? Something else entirely?

--MechEng2005

 

[connectegr]

The detail is confusing. But, it appears to give the length of weld expected. Start at the end and provide the require length. This may or may-not encroach the 2 1/2" dimension. But, I am not aware of any D1.1 code required clearance.

http://www.FerrellEngineering.com

 

[StuSE]

What I was concerned about was if there were any code specified minimums in this regard. I have not seen anything in ACI, or AWS D1.4 but I was fishing a bit to see if anyone in the engineering community knew of any such requirements

 

[lawayosh]

Take a look at D1.4 Section 4.2.6 and Figure 4.2 which call out a minimum distance from the point of tangency equal or greater than 2 bar diameters.

Yosh

 

[racookpe1978]

It appears that the designer was intending a specific length be provided: Do you have any reason to suspect that the chosen length is too short?

If the length were longer, more weld (more time, more metal, more cost) would be needed as the bar bends away from the tangent, and little added strength would be added since the extra weld would "fill in" the increasingly large gap.

Unless you see something to indicate there is a problem, weld it per plan.

Note the symbol - He wants you to weld both sides of the bar.

 

[hokie66]

The detail is not good for highly stressed bars, as the bar will straighten out first, then "zip" the weld.

 

[racookpe1978]

Zipping the bar?

I was assuming the load on the bar is tension, in the length (axial direction) of the bar so the stress tends to "close up" the bar and reduce the angle.

You think it's pulling "away" from the bend - radial to the bar and weld.

 

[dik]

Welding near the bend is not overly problematic... should make sure the rebar is weldable... some rebar isn't.

Dik