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STRENGTH
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The tensile properties of structural steels are not affected by galvanizing, as shown in the table.
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Tensile properties of structural steel, test on plates 12.7mm thick
Source: ILZRO, 2006
WELDING
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Welding slag is not removed in the cleaning process and 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 minimise the incidence of raised weld seams after hot dip galvanizing, the silicon content of the welding rod material should be less than 0.04%. Anti-spatter weld sprays should be water-soluble and should be oil and silicone free. (refer to Joining Galvanized Steel)
LABELING AND MARKING
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Water soluble paint or detachable metal labels can be used for temporary identification marks on fabrications. Enamel based paints or oil based markers must not be used. For permanent identification to be legible after galvanizing, large heavily punched or embossed marks are necessary.
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