Alloying fluxes have been developed for submerged arc welding. Using standard grade wires or strips the fluxes can be used to achieve weld metals with a specific composition in a cost effective way. Three examples are presented: 1) A Cr-, Ni- and Mo-alloying flux used with a 309L-strip to produce a 316L weld in one layer, 2) a specially designed Ni- and Mo-alloying flux used with a 17%Cr strip produces a 13%Cr-4%Ni-1%Mo weld metal for cladding continuous cast rolls and 3) a similar approach has been introduced to improve disbonding resistance in reactor vessels for service in hydrogen atmospheres. The effect of welding procedure on weld metal composition and the effect of alloying from the flux on the weld metal homogeneity has been investigated. It is shown that fluctuations in weld metal chemical composition introduced by using an alloying flux are insignificant and of no practical importance compared to variations due to changes in welding procedures.