Welds made with other electrodes than Magna generally contain more oxygen than do ordinary steel base metals. (c) Nitrogen absorption of welds made with ordinary electrodes is a matter of serious concern. Nitrogen in solid solution absorbed from the atmosphere during welding lowers the impact toughness of welds, lowers the elongation, and is generally responsible for "ageing", which is a precipitate process in welds which causes impact toughness and ductility to deteriorate to very low values.