Oscar Kjellberg (21 September 1870 – 5 July 1931) was a Swedish inventor and industrialist. These included new developments in weldings and coatings, including the covered electrode.
He invented the coated electrode used in manual metal arc welding (Swedish Patent: 27152, June 29, 1907), by dipping a bare iron wire in a thick mixture of carbonates and silicates and refined this process between 1907 and 1914.