Radii of curving

Table 4.2 gives the typical radii to which a range of sections can be curved about their major (x-x) axis. These are considered as minimum radii, although tighter bends may be considered for some uses. Within one serial size, heavier weights (or thicker walls) can be curved to smaller radii than lighter ones. Sections can be curved about the major or minor axis, and reversed curves and hoop shapes are also possible.

The minimum radius to which sections can typically be bent varies from less than 1 m for the smaller sections to some 50 m for the largest. The normal tolerance for a particular radius of curve is 8 mm. Curving is performed by 'cold' bending, which involves passing the member through a set of three rollers. These rollers are purposemade to match the precise shape of the cross-section being bent in order to avoid local buckling of the section. Larger sections can be heated locally (induction heating) to achieve smoother, tighter curves.

A general fabricator may be able to perform such work, but most curving is performed by specialists who have developed their own range of bending rolls to enable the entire range of sections to be curved.

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