ROLL FORMING STRUCTURAL STEEL PROFILES WITH GALVANISED COATING

摘要

Structural steel profiles such as channels (2), having a material thickness greater than 2mm, are roll-formed to a preform profile with corners partially bent, in-line galvanised, and then further roll-formed to final shape. The preform profile has upwardly facing convex surfaces (3) allowing rapid shedding of excess galvanising material. By preforming corners before galvanising, surface elongation in the galvanising layer is minimised and craking eliminated. This is enhanced by constant length bending of corners over preform and final roll-forming operations.