Method of preventing sag of panel and apparatus therefor

Details Method of preventing sag of panel and apparatus therefor Method of preventing sag of panel and apparatus therefor

B - Operations, Transporting

23

K

309/15, 327/90,

B23K 31/02 (2006.01) B21D 47/00 (2006.01) B23K 11/34 (2006.01)

Patent

CA 1257318

ABSTRACT OF THE DISCLOSURE: A method and apparatus for preventing a sag of a panel, in which a plate to be attached to a skeleton is located on the skeleton supported by a supporter, both end parts of the plate are gripped by grasp electrodes of a resistance heating device, current is caused to flow through the plate by the grasp electrodes to preheat the plate to a predetermined temperature and to thermally expand it, the plate is welded to the skeleton by a welding machine, and a tensile residual stress is develop- ed in the plate by a thermal shrinkage deformation attendant upon cooling of the plate after the welding. In a case where the plate has a cut-away part, electric conduction members for short-circuiting the cut-away part are interposed in this part so as to form electric conduc- tion paths for the preheating of the plate.

523247

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