Design considerations for Glavanizing

Bath Size

TOP - 5M X 1.8M X 1.6M
SPIN - 3M X 1M X 2M
All items are raised on a crane, tilted to an angle of approximately 30° before being dipped in molten zinc.
R&C are able to offer larger sizes if required, please contact us for more details.

Falling Weight Test

A physical test of a coatings performance, measured by allowing a measured weight to fall a measured distance under gravity to impact a sample plate. The result of the test is described by the damage the plate suffers from the impact.

Handling

Depending upon size and shape, articles for galvanizing may require suspension holes or lifting lugs. They may alternatively be handled by chains, or for smaller articles, on racks or in baskets.

Labelling and Marking

Water soluble paint or detachable metal labels can be used for temporary identification marks on fabrications. Enamel based paints or oil based markers should NOT be used. For permanent identification, to be legible after galvanizing, large heavily punched or welded marks are necessary.

Surface Contamination

Clean steel surfaces are essential for good galvanizing.
Contamination in the form of grease, tar, paint and weld slag cannot be removed by chemical cleaning and may result in black bare spots after galvanizing.
Anti spatter weld sprays should be water-soluble to allow removal by the galvanizer during pretreatment stages.

Venting and Draining

On many sections of steelwork, provision must be made for venting and draining. Every sealed section of a fabrication must be vented for safety and to allow access and drainage of molten zinc, with holes diagonally opposite each other and as close as possible to the sealed end.
See the diagrams below

If you‘re still not sure, send us a sketch and we‘ll mark vent and drain holes for you.

Welding

If welding slag is not removed in the cleaning process it may result in black bare spots after hot dip galvanizing.

To avoid this problem, efforts should be made to use gas shielded welding processes e.g. M.I.G. and if coated electrodes are used, welds should be thoroughly de-slagged. In order to minimize the incidence of raised weld seams after galvanizing the silicon content of the welding rod material should be less than 0.04%.