Learn the essential steps for welding cast iron with ENiCu-B, including identification, groove preparation, heat control, peening, and cooling.
ENiCu-B is an AWS A5.15 nickel-copper covered electrode used for selected cast-iron welding and repair. Successful results depend on preparation and heat control as much as electrode choice.
Step 1: Identify the Casting
Determine whether the component is gray, ductile, malleable, or alloyed cast iron. Different grades respond differently to welding.
Step 2: Remove the Defect
Locate the complete crack and grind to sound material. Use a smooth U-shaped groove where practical. Remove oil, paint, rust, and graphite smear.
Step 3: Select the Thermal Method
A cold technique uses short beads, low heat input, interpass cooling, and peening. A hot method uses controlled preheat and slow cooling. The casting's size, restraint, grade, and service determine the choice.
Step 4: Weld Carefully
- Use the recommended polarity and current.
- Maintain a short arc.
- Deposit short stringer beads.
- Avoid excessive weaving.
- Lightly peen each bead when specified.
- Clean thoroughly before the next pass.
Step 5: Control Cooling
Rapid, uneven cooling can crack the heat-affected zone. Use the cooling method specified by the repair procedure.
Step 6: Inspect and Machine
Check the repair for surface and delayed cracks. ENiCu-B deposits are generally selected where post-weld machinability is useful.
Dayang Welding supplies ENiCu-B electrodes in common sizes for industrial cast-iron repair.
