Steel hypothetical question hypothetical restraint should note: In order to reduce steel welding deformation. Welds should be as symmetrical arrangement; not arbitrarily increase the weld thickness; the premise of ensuring safety of welds should not be too concentrated. Construction Control and Prevention. Prefabricated moral restraint, not segmented measurement; after the release of the steel wire size should be the amount of the full-length sub dimensions. Save the cumulative size. For members require a higher dimension, should put the line marked like red eyes. To ensure that the cutting edge of the cutting quality, 12mm below the board should try to mechanical cutting. When cutting with gas welding steel, steel specifications should be considered to extend the margin 2-3mm aside. Should be corrected; deformed steel beyond designated tolerance range. If the allowable value for the scale delineation of cold deformation correction and cold bending radius of curvature of the minimum and maximum bending vectors should be used to correct or use steel pressure jack homemade correct tools to perform cold correction, incident corrections. Style pattern shown in execution; or if the deformation of a steel member of a larger linear expansion coefficient -6