This specification deals with safeguarding against warpage and distortion during hot-dip galvanizing of steel assemblies. Common distorted and warped members of assemblies are sheets or plates assembled by welding or riveting. The following can cause warpage and distortion: use of nonsymmetrical sections such as channels; use of checkered plate; not properly vented overlapping joint for two pieces of steel; and too large assembly for a particular galvanizing kettle. Suggested corrections for panel fabrication are detailed.
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1.1 Steel assemblies and subassemblies fabricated by welding, such as composite structural members, sash, weldments, etc., that are to be hot-dip galvanized after fabrication, are subject to warpage and distortion of the material due to the heating and cooling integral to the galvanizing operation, particularly when it is necessary for the assembly to be dipped more than once to coat the entire surface.
1.2 This specification is applicable in either inch pounds or SI units. Inch pounds and SI units are not necessarily exact equivalents. Within the text of this specification and where appropriate, SI units are shown in parentheses.
2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.
A143/A143M Practice for Safeguarding Against Embrittlement of Hot-Dip Galvanized Structural Steel Products and Procedure for Detecting Embrittlement
A385 Practice for Providing High-Quality Zinc Coatings (Hot-Dip)
A780 Practice for Repair of Damaged and Uncoated Areas of Hot-Dip Galvanized Coatings
coatings-zinc; galvanized coatings; steel products-metallic coated; zinc coatings-steel products;
ICS Number Code 25.220.20 (Surface treatment)
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