This paper shows that the laser cladding and alloying of a Ni-base superalloy on a substrate of plain carbon steel can be successfully carried out by irradiating a bilayer sample formed by metallic sheets mechanically clamped together. Under laser irradiation, both the overlayer and the subs:rate are locally melted. Controlled dilution of the alloy elements of the superalloy in the melted pool allows a variety of surface chemical compositions and microstructures to be obtained.