Belt Eutectic
A specific eutectic microstructural constituent in cast iron alloys that forms in designated zones during solidification and influences mechanical properties. It significantly governs the flow and solidification behavior of the melt.
Belt Eutectic is a term that doesn't exist in the workshop – someone was pulling your leg. What you mean is the treatment of cast iron with inoculants. These are additives that influence graphite precipitation and prevent the formation of hard, brittle structures. When welding cast iron, the main thing is to control cooling. If the part cools too fast, it becomes hard and prone to cracking. That's why you preheat and cool slowly, not because of any 'belt content'. Forget the numbers and complicated formulas – what matters is that you preheat properly, use suitable filler material, and let the workpiece cool slowly afterwards.