Superduplex stainless steel has been welded with Ni-26Cr 14Mo and Ni-23Cr 16Mo type Ni-base consumables using different combinations of welding method, joint preparation and consumables for filling and buttering. Microstructural studies, mechanical testing and corrosion testing were performed to clarify the influence of heat input and dilution on properties. Weld metal strength matched requirements for superduplex stainless steels and a better pitting corrosion resistance than obtained with conventional superduplex consumables was consistently achieved together with good low temperature toughness. Minimum 0.38mm lateral expansion, alternatively minimum 27 J, at –100°C was easily achieved for standard joint configurations. However, minimising dilution and avoiding excessive heat input are clearly key factors when aiming at maximum impact toughness and ductility. Diagrams predicting weld metal toughness at different dilution levels and heat inputs have therefore been constructed.