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The process begins with proper preparation of the cast iron surface. It should be clean, free from rust, scale, and oil to ensure a strong bond It should be clean, free from rust, scale, and oil to ensure a strong bond It should be clean, free from rust, scale, and oil to ensure a strong bond It should be clean, free from rust, scale, and oil to ensure a strong bondflux core welding cast iron. Preheating the workpiece can also help reduce stress and prevent cracking. During welding, a slower travel speed and deeper penetration are preferred to achieve a sound weld. Post-weld heat treatment may also be necessary to relieve stresses and improve the weld's mechanical properties.