Mitigation of Weldment Cracking in Steel Highway Structures Due to the Galvanizing Process (2021) / Chapter Skim
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6 Galvanizing steel structures is a large-scale industrial process in which steel components are dipped in molten zinc (∼840°F) to form a metallurgical bond between the steel part and a thick layer of zinc and zinc-iron intermetallic layers that protect the steel from corrosion.
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Background and Literature Review 7 A review of national and international standards and specifications, state department of transportation (DOT) practices (including materials selection, geometric detailing, welding procedures, and galvanizing procedures)
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8 Mitigation of Weldment Cracking in Steel Highway Structures Due to the Galvanizing Process 0 20 40 60 0 5 10 15 20 σ( kg f/ m m 2)
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Background and Literature Review 9 Although the reduction of ductility is the main result of LMAC, the susceptibility of structural steel to cracking during the galvanizing process is influenced by a number of factors. There are multiple combinations of factors that would increase the likelihood of LMAC, as discussed in this report: • Localized Stress – Residual stresses arising from rolling, cold-working, welding, and cutting processes – Imperfections resulting from thermal cutting – Stress concentration factors (SCFs)
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