Galvanized Steel Pipe Manufacturing Process
Galvanized Steel Pipe Manufacturing Process
Blog Article
Galvanized strip pipe is a steel pipe made from cold-rolled galvanized strip steel. It is formed by cold bending and welded by high frequency. The pipe has strong corrosion resistance and protection features.
1. Loading Process
The first step involves fixing the galvanized strip steel onto the material rack. This ensures that the steel can be conveniently placed into the storage box for further processing. Our company uses an advanced MES system to provide real-time scheduling and production information, improving operational efficiency and ensuring smooth raw material flow for continuous unit operation.
2. Forming and Welding Zinc Supplementation Process
In this step, the strip steel is transformed into a steel pipe through forming rollers. Next, the welding process uses advanced ERW (Electric Resistance Welding) technology, which applies high-frequency energy to heat the surface of the weldment. This results in a small heat-affected zone, enhancing both welding speed and quality. Zinc is supplemented in the weld using two 1.5mm diameter zinc wires with a 99.99% zinc content, optimizing the corrosion resistance of the steel pipe. The weld remains hidden, ensuring the corrosion protection is uniform across the entire pipe.
3. Sizing and Straightening Process
The steel pipe is shaped and its diameter adjusted through shaping rollers. Straightening rollers ensure that the pipe maintains a straight form. Additionally, the round pipe can be converted into a square shape if needed.
4. Flying Saw Cutting Process
Once the steel pipe reaches the desired length, it is automatically cut using a high-speed flying saw. The latest generation flying saws operate at speeds of 150-180 meters per minute. This ensures a smooth interface at the end of the pipe, which is essential for the ease of further processing.
5. Weld Inspection Process
Stringent quality control is performed on every product. Any unqualified pipes are separated and downgraded, ensuring that only high-quality steel pipes are packaged and delivered.
6. Coding and Labeling Process
Each steel pipe is clearly marked with a unique code using a high-quality French inkjet printer. This coding is durable and fade-resistant. It includes the product trademark, promotional slogans, and the implementation standards to ensure traceability and customer confidence.
7. Passivation Process
Our patented galvanized pipe passivation liquid automatic spraying system is used to apply the passivation liquid evenly around the pipe at a 360° angle. The high passivation efficiency ensures the pipes meet the 18-hour salt spray test without corrosion, providing long-lasting protection.
8. Automatic Unloading and Packaging Process
We employ state-of-the-art automation for the unloading and packaging of steel pipes. A mechanical arm transfers the pipe to a conveyor chain, where an automatic sensor identifies the position of each pipe. The system guides the pipe, and the automatic stacking machine arranges the pipes according to preset instructions. This entire process is automated, requiring minimal manual intervention, with workers only monitoring the system’s correct operation.
9. Automatic Weighing and Labeling Process
Once the steel pipes are packaged, they are transferred to a weighing device where they are automatically weighed and labeled. The system ensures accurate weight and provides a unique QR code for each steel pipe, containing key details such as product specifications, production date, raw material manufacturer, production team, and individual pipe weight for easy traceability.
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