Kiljan is one of the oldest businesses ever to be set up in Den Helder. The welding and construction company was established at the start of the nineteenth century as a blacksmith. Throughout the course of the years the horses have been replaced by modern machines, and the forge by a modern welding and construction workshop. In 1999 the company was taken over by the Jongejans family, who in 2004 opened a modern and new premises on the Kooypunt industrial park. Kiljan specialises in the manufacture of small steel structures for various industrial sectors, including commercial and industrial buildings, ship construction and the gas and oil industry. Steel repair work is also carried out. In addition to steel, aluminium and stainless steel is also processed.