What should you pay attention to when repairing carbon steel castings?

1. When it is planned to use welding method to repair defects in carbon steel castings, the defects and welding process regulations should be reviewed.

2. When gas cutting or carbon arc gouging is used to remove defects in important castings, necessary preheating can be carried out according to the chemical composition of the casting, the size and nature of the defects.

3. Defects in carbon steel castings can be found during visual inspection or after heat treatment or processing. Unallowed defects can be removed by machining, cutting, polishing, gas cutting or carbon arc planing.

4. After welding and repairing defects in carbon steel castings, the welding part and the nearby base metal must be polished, and non-destructive testing must be conducted based on the number, size and location of the original defects to confirm that all defects have been removed.

5. After removing defects from carbon steel castings, non-destructive testing should be performed to confirm that the defects have been completely removed. When the shallow grooves or pits caused by the removal of defects will not weaken the strength of the casting, it can be ground into a smooth arc-shaped transition surface.