Joe, I started with 5 layers, 3 - 1'' thick W2 and 2 - 1/4'' thick iron, so I figure 85% W2 and 15% iron. I did this to effect the hamon instead of a high contrast pattern, at this layer count it has complete carbon migration at around .85 carbon, it cuts great. I weld the billet, then draw it out to around 30'' and cut into 5 or 6 pieces and restack, about 6 welding heats, lot of layers with fewer welding heats this way.