Weld across the Flange
Weld across the Flange
(OP)
With a steel beam we've always been very careful about trying to avoid welding across a beam flange while it is under stress and carrying load.
The theory is that if you weld across the flange, you introduce excessive heat that can possibly affect the entire flange and possibly cause collapse.
The question we have is:
1. Is there a specification or AWS procedure out there that controls the weld process such that this doesn't happen?
2. Is the procedure such that it depends on the weld size, flange thickness, weld process, etc.?
3. Does it matter if the flange is in compression vs. tension in terms of the danger?
The theory is that if you weld across the flange, you introduce excessive heat that can possibly affect the entire flange and possibly cause collapse.
The question we have is:
1. Is there a specification or AWS procedure out there that controls the weld process such that this doesn't happen?
2. Is the procedure such that it depends on the weld size, flange thickness, weld process, etc.?
3. Does it matter if the flange is in compression vs. tension in terms of the danger?
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RE: Weld across the Flange
Not that I am aware of.....probably something they don't want to touch for liability purposes anyway.
I don't know about any AWS procedure......but a good article on this (that takes into account heat input by weld procedure, temperature vs. strength, tension vs. compression, etc.) is:
'Repair Welding Under Load', by: Haensch & Augustyn, published in: "Welding in the World", Vol. 28, No. 9/10, pp. 174-182, 1990.
You can come out of it with all sorts of approaches.....but typically what I have done (for design purposes, after studying the temperature contours in the article) is disregard the flange (and about 5" of the web) during welding for my strength check (if feasible). If that doesn't work, I start adjusting strength parameters based on reduced yield values.
I also direct them in the drawings (if they are welding across both flanges) to allow the first weld to cool before proceeding with the next one.
RE: Weld across the Flange
The link in the article above does not work, but the video is on AISC's YouTube page.
www.SlideRuleEra.net
www.VacuumTubeEra.net
RE: Weld across the Flange
Does anyone have a copy of the Welding in the World reference? I can not find it on line and would like to see an example of calculating the heat input versus temperature curves.
Blodgett also covers this topic in section 7.6
RE: Weld across the Flange
I'd post it.....but I'm pretty sure I agreed to observe the copyright when I bought it. It has a pretty useful nomogram that reduces the cross sectional area based on heat input, cross sectional shape, velocity of weld, etc.
One thing about the temperature contours shown in some figures that I noted was: they tended to top out at about 1500o C near the point of the weld. (And this was for a regular weld.) I always thought welding temps came in much higher than that. But is that for a area right at the tip of the stick? (Question for anyone interested or who knows.)
RE: Weld across the Flange
RE: Weld across the Flange
Not at this point. It might have been the International Institute of Welding.
RE: Weld across the Flange
RE: Weld across the Flange
RE: Weld across the Flange