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This International Standard specifies requirements for embossed-resistance-projection welding in the fabrication of assemblies of uncoated and metallic coated low carbon steel comprising two thicknesses of metal, where the maximum single sheet thickness of components to be welded is within the range 0,4 mm to 3 mm for the following materials: -- uncoated steels; -- hot-dip zinc or iron-zinc alloy (galvannealed) coated steel; -- electrolytic zinc, zinc-iron, or zinc-nickel coated steel; -- aluminium coated steel; -- zinc-aluminium coated steel. Organic-coated or primer-coated steels are not covered by this International Standard. Guidelines for appropriate welding equipment and projection welding conditions for various coated steels are given in Annexes A to C. These are for guidance only and may need to be adapted to suit the specified service conditions of the fabrication, prevailing production conditions, type of welding equipment, mechanical and electrical characteristics of the welding machine, electrode configuration, and material. These requirements shall be taken from the relevant welding procedure specification for the application or procedure, where these exist.