Most fabrications lend themselves well to the galvanizing process, including asymmetrical designs or structures containing sections of unequal thickness. It is important to understand that, because during galvanizing steel is exposed to temperature variations, fabrications of asymmetrical design or with sections of unequal thickness can exhibit different thermal expansion and contraction stresses, leading to changes in shape and/or alignment (warping and distortion). Welding- or bending-induced stresses that reside in the material after fabrication may possibly be released during galvanizing, also resulting in structural changes in shape and/or alignment. Bracing—permanent or removable after galvanizing—provides stability during the thermal expansion and contraction cycle. Occasionally, when bracing is not used and warping and/or distortion occur, the part will return to its original shape during cool-down.

Are you still looking for the right answer? Ask an Expert

Comments

Laura Hanson

That may be the case. More information on distortion and warping can be found on the following pages: http://www.galvanizeit.org/design-and-fabrication/design-considerations/distortion-and-warping/ and http://www.galvanizeit.org/design-and-fabrication/fabrication-considerations/distortion-and-warping/.

Vince Padilla

We have some fabricated and galvanized stairs, that both used 14 gauge for the landings, treads, and risers.  The stairs with MC 12 x 31 steel channel stringers experienced significant warping at the 14 gauge items.  The stairs with C12 x 20.7 did not experience the warping.  Our Client needs an explanation as to why they are different.  Is it most likely caused due to the MC 12 x 31 channels being heavier and therefore experiencing greater temperatures during the galvanizing process?  Please let me know as quickly as possible.  Thank you.

Vince Padilla - Project Manager

Add Your Comment