1, rust removal
A. According to the requirements of SY/T0407, clear the oil, grease and other sundries in the anti-corrosion
part of the rust remover.
B. When the weather is wet, preheat the steel tube to 50 degrees before removing the rust. Rust removal
level:Sa2.5 or St3.0 Level.
C. Trim the outer anti-corrosion layer at both ends of the welding joint into a slope, and use sand cloth or
wire brush to roughen the joints.
2. Pipe body preheating
A. Adjust the baking gun to the medium fire to preheat the steel body. Preheat the steel body evenly, not
too quickly, and keep the surrounding temperature of the steel tube.
B. The preheating temperature shall be controlled and maintained to 60-80 degrees. Generally, the preheating
time shall not be less than 5 minutes More time.
C. Temperature sampling is conducted around the steel body with a temperature measuring instrument. When
temperature measurement is conducted, naked steel shall not be directly measured. The actual temperature is
A little primer should be applied to the bare steel to measure the primer temperature.
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