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Fillet weld crossing butt weld
4

Fillet weld crossing butt weld

Fillet weld crossing butt weld

(OP)
Hello,

There is column to column butt weld & both columns are open H section.
Now on the this butt weld, we have a fin plate to be fillet welded?
As you can see the column butt weld is crossed by the Fin plate fillet weld.
It is not possible to avoid the situation, so what can be done to make sure I comply with the requirements of Eurocodes as well as EN 1090. Unfortunately I could not find any special requirement for such case in any of the guidelines, but my senior says it is not good engineering practice hence we should avoid it.
FYI: Fin plate will be supporting a bolted safety railing pipe only.
So considering above case shall I keep the weld as it is OR need to make any special arrangement for it?

GD_P

RE: Fillet weld crossing butt weld

I'm not familiar with the Eurocode provisions, so I'm not sure if any of these suggestions will help you, but here goes.

Can you weld the fin plate only on one side of the butt weld and just extend it in front of the other? Two separate fin plates each bolted separately to a gusset for the railing? When joining wide flange bridge girders with a welded splice, we leave a hole at the top and bottom of the web to give some separation between the flange welds and the web welds. Something similar, a semicircular 'notch' in the fin plate over the butt weld, perhaps, would alleviate concerns over stress risers.

RE: Fillet weld crossing butt weld

As far as I know, EN1090-2 does not prohibit this. While I do know the eurocodes, I can not say for sure they mention this case. I doubt so.

Crossing welds is not necessarily a bad practice, however if you could provide a rat hole over the weld without introducing other problems, I'd do so as well. On the other side, you are talking structural steel and probably low loaded welds, so even if you grind flat the butt weld and weld over it, I'd doubt you'll have any negative side effects locally.

RE: Fillet weld crossing butt weld

I think it is a common practice in silos and pipes. The shell is butt welded and the shell to flange is a butt weld or a fillet weld. I don't know of any provisions in the codes regarding this.
Best regards,

RE: Fillet weld crossing butt weld

(OP)
Thank you all for your suggestions.

Actually I was concern about the column butt weld, but utilization ratio of the butt weld is very low (since no lateral load other than the imperfections acts).
So we will prefer to ground flush the weld & fillet weld over it.

GD_P

RE: Fillet weld crossing butt weld

Welded properly, I'm not sure how this would be a problem. This sort of thing gets done pretty consistently in mechanical fabrication. It's a different weld direction, but prepped properly it shouldn't be fundamentally different than any situation involving laying weld material on top of other weld material, which is an inherent part of any multipass weld.

You probably want to grind the butt weld flush so that you have a good surface to work with, but that's just my assumption.

RE: Fillet weld crossing butt weld

Do as TLHS notes or cope the fin plate to avoid the butt weld. I don't know Eurocode, but wouldn't be an issue here in US.

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