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Originally Posted by Andrew Blair
I was under the impression that, with the exception of the fact that you're adding extra metal around that joint, a weld is actually far weaker in a heat treated alloy. For example, with 6061 T6, the weld is reduced to T0, and therefore, the weld was at a disadvatage to the rest of the material. The only way to restore the strength is to reduce everything to T0, and re-heat treat.
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I think(again not sure) that this is only true for heat treated metals and not standard metals
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Originally Posted by Andrew Blair
On a side note, what's a good way to heat sink a frame so that it warps far less when welding? I remember 67 talking about doing that when they were welding their 2005 bot. I also thought they re-heat treated it.
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The best solution would be to take your time and do it right. just use spot welds all the way around allowing it to cool some before starting the next weld. Running a bead all the way around and going too quick will likely warp thin metal.