... welding slag, burr, oil, dirt and so on. After rusting, please handle the defect in the surface of ... keep the temperature not less than 5°C. When you start to operate, you should keep the temperature of ... welding slag, burr, oil, dirt and so on. After rusting, please handle the defect in the surface of ... keep the temperature not less than 5°C. When you start to operate, you should keep the temperature of ...