Technical requirements for repair welding

Defects must be thoroughly removed before repair welding, and the groove surface should be repaired smoothly and without sharp corners.


1. Defects must be thoroughly removed before repair welding, and the groove surface should be repaired smoothly and without sharp corners.

2. According to the defects of the steel castings, the repair welding area defects can be removed by shoveling, grinding, carbon arc gouging, gas cutting or mechanical processing.

3. Dirt such as sand, oil, water, rust, etc. within 20mm around the repair welding area and the groove must be thoroughly cleaned.

4. During the whole repair welding process, the temperature of the preheating zone of the steel castings shall not be lower than 350°C.

5. When conditions permit, weld as much as possible in a horizontal position.

6. When repairing welding, the welding rod should not make excessive lateral swing.

7. When welding the surface of steel castings, the overlap between the weld beads shall not be less than 1/3 of the weld bead width.


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