We are thinking about Sub arc welding 1 1/8th plate without strongbacks. The vee prep is 5/16 both sides and opartial penetration required only. Would it be safe to lift the plate over after the first weld? The two plates are 7.5 feet wide and 27 feet long to make up a single of 15 by 27 when welded. We are wondering about the notch strength of the bead at the root. Randy
No. Ignoring the notch issue, the governing dimension is around .350" in the weld area. (5/16" + some extra for the penetration, I'm being conservative.) So this will behave like a beam of .350" high that weighs
12*.28*1.125 per inch of width. Pick a failure strength somewhere around 50 kpsi to 60 kpsi, use the equally loaded beam formula, it fails the first time you nudge it. Add the notch issue back in and you go from a faint maybe to a you have got to be kidding.Cheers.
Randy Zimmerman wrote:
That was the seat of the pants lunch room comment. We suggested that if someone was caught under the lift we would be scraping him off of the concrete for years to come. Lunchroom conjecture was that we will lose a day of labour with repair and prep of the edge. The whole intent is that " It takes too much time to put strongbacks on and take them off." I will have an answer about this little experiment tomorrow. Hopefully no one is injured. Randy
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