Analysis of an over-weld ??
Analysis of an over-weld ??
(OP)
There are welding criteria that state the max thickness of a weld. I assume that if the weld is thicker than the material it is welding, this will alter the failure of the member. Is this correct?
Is there a way to analyze something that has been over-welded? I have a structure I'm analyzing and the truss web members have been welded with a filet that is thicker than they are.
Thanks in advance!
Is there a way to analyze something that has been over-welded? I have a structure I'm analyzing and the truss web members have been welded with a filet that is thicker than they are.
Thanks in advance!






RE: Analysis of an over-weld ??
RE: Analysis of an over-weld ??
Maximum weld size is specified because of heat imput. Large welds relative to thin plates might just 'melt' the plate or distort it too much.
If you are analyzing an existing weld, and the parent material is OK, I do not see much of an issue.
RE: Analysis of an over-weld ??
The max fillet weld size for a plate > 1/4" is 1/16" less than the plate size.
The reason for this has more to do with ensuring that the proper weld size is achieved than on any strength considerations (beyond the obvious fact that a fillet weld extending beyond the edge of a plate is essentially welding air).
The reasoning behind this is that a welder welding a thick plate could conceivably melt away the top edge of the plate, making it appear as though there is more weld than is actually deposited. By essentially requiring that the edge of the plate be visible, the size of the weld can be accurately determined.
RE: Analysis of an over-weld ??
RE: Analysis of an over-weld ??
But you're absolutely right. What I wrote above only applies to edge conditions.
RE: Analysis of an over-weld ??
What I was after was more along the lines of what kelowna and frv commented on w/ how it can affect the members being welded.
It sounds like there really isn't a way to determine how this may affect the structure except to look for visible deformations that may have occurred.
Thanks to all of your for your input.
RE: Analysis of an over-weld ??
There are still weld profile considerations. Some codes address excess concavity/"reinforcement".
Hg
Eng-Tips policies: FAQ731-376: Eng-Tips.com Forum Policies
RE: Analysis of an over-weld ??
The as-welded condition may encroach on the 1/16" provided the weld size is clearly verifiable. Meaning that one still needs a positive reference point in which to place the fillet gauge to determine the weld size.
The typical overwelding I see comes in the form of excess convexity, creating excess tension in the weld face and possible toe cracking.
Gregory A. Johnson, P.E.
www.midwesttestinglabs.com
RE: Analysis of an over-weld ??
Hg
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