1. The defects must be completely removed before welding, and the groove surface should be smooth and smooth, and no sharp corners should exist.
2. According to the defects of the steel castings, the defects in the welding area can be removed by shovel, grinding, carbon arc gouging, gas cutting or machining.
3. The sand, oil, water, rust and other dirt within 20mm around the weld zone and the groove must be thoroughly cleaned.
4. During the whole process of welding, the temperature of the preheating zone of the steel castings shall not be lower than 350 °C.
5. Apply welding as much as possible to the horizontal position, if possible.
6. During repair welding, the electrode should not be subjected to excessive lateral oscillation.
7. When the surface of the steel casting is welded, the overlap between the weld beads shall not be less than 1/3 of the width of the weld bead. The welding meat is full, the welding surface is free of burns, cracks and obvious nodules. The weld has a beautiful appearance and has no defects such as biting meat, slag, pores, cracks and splashes; the welding wave is uniform.
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