Yes, it is possible to weld cast iron using MIG (Metal Inert Gas) welding, but it can be more challenging compared to other welding methods. MIG welding requires precise control over the heat input, and cast iron is prone to cracking due to its high carbon content and brittleness. However, by using proper techniques and precautions, MIG welding can be successful. Preheating the cast iron, using a nickel-based filler material, and controlling the cooling rate are essential for achieving a strong and crack-resistant weld. It is important to note that MIG welding cast iron may require some expertise and practice to master.