This document specifies requirements for resistance spot welding in the fabrication of assemblies of uncoated and metallic-coated or weldable non-metallic-coated low-carbon steel, comprising two or three sheets of metal, where the maximum single-sheet thickness of components to be welded is within the range 0,4mm to 3,0mm. This document is applicable to welding of sheets of the same or unequal thickness, where the thickness ratio is less than or equal to 3:1. Welding with the following types of equipment is within the scope of this document: a) pedestal welding equipment; b) portable welding guns; c) automatic welding equipment where the components are fed by robots or automatic feeding equipment; d) multi-spot-welding machines; e) robotic welding machines.