I have successfully used stainless rod to weld stainless to mild steel, and stainless to other steels.portalrover said:i have been told that stainless rods would also be suitable.
I have recently been to some important historic military sites such as the Ardennes in Belgium (Battle of the bulge) and the Marginot Line in France. I have had the opportunity to examine a number of German and American tanks. Interestingly, all the original welds were done with stainless welding rods (even though the rest of the tank is normal steel). I assume it was because some sections were hardened sheet steel and others were cast steel, but even when similar metals have been joined stainless rods were used.