Introduction to conventional welding process, energy source for fusion welding, heat flow and fluid flow for fusion welding, fluxes for fusion welding, slag/metal interaction, solid state transformation, cracking phenomena, gases in welds. Special welding processes: TIG, ESW, plasma, ultrasonic, laser, electron beam welding, surface hardening, weldability of metals and alloys, stresses in welds, welding of carbon steels, low alloy steels, stainless steels. Cast iron, welding of non-ferrous and composite materials, numerical aspects of modeling the welds, weld design, weld tests. Computers in Welding.