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RE: disortion from heating[Subject Prev][Subject Next][Thread Prev][Thread Next]
- To: "'seaint(--nospam--at)seaint.org'" <seaint(--nospam--at)seaint.org>
- Subject: RE: disortion from heating
- From: Harold Sprague <harold.sprague(--nospam--at)neenan.com>
- Date: Tue, 5 Jan 1999 18:08:16 -0700
Roy, Residual compressive stresses are trapped in steel as it is rolled. If the heat is applied uniformly across an entire surface, the residual compressive stresses are relieved and the heated section contracts. That is why heat cambering uses large heated wedges which will contract and camber the beam. If heat is applied locally, the heat will cause the local area to expand. Heat straightening is an art. It is another of the arts that I can't do, but I can appreciate. Welding heat is highly localized. The only thing I can say about your example is that the plate will distort. Regards, Harold Sprague The Neenan Company harold.sprague(--nospam--at)neenan.com -----Original Message----- From: RoyLevy(--nospam--at)aol.com [mailto:RoyLevy(--nospam--at)aol.com] Sent: Tuesday, January 05, 1999 5:37 PM To: seaint(--nospam--at)seaint.org Subject: disortion from heating Many years ago I heard of a team of technicians who had developed a technique to straighten deformed steel bridge structures in place by flame- straightening. To help me understand the principles, this is my question: Assume a steel plate say 3/8" thick by 4" wide and 3 ft long, simply supported at the ends, say resting on a pair of saw horses. Heat is applied across the top at the center, for example by welding a 1/4 x 4 " wide gusset plate at the center, across and perpendicular to the plate ( 2 3/16" f illet welds, 4 '' long , for example) . Will the center of the plate rise or will it sag ? In another form, the question is which will prevail - The loss of rigidity while the top is molten or the contraction effect upon cooling?
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