The production process of square steel pipes mainly includes the selection of raw materials, flattening of steel plates, welding, straightening, cutting, straightening, and finished product inspection.
1. Selection of raw materials: The raw materials for square steel pipes are generally high-quality steel plates. According to different purposes and requirements, suitable materials are selected, such as ordinary carbon structural steel, low alloy high-strength steel, etc.
2. The selected steel plate needs to be flattened and repaired with mechanical equipment to ensure that the flatness of the steel plate meets the requirements.
3. Welding: The flattened steel plates are connected through a welding process to form a square tubular structure. Common welding methods include electric welding, gas welding, laser welding, etc. Choose the appropriate method according to different needs.
4. After straightening and welding, the square steel pipe needs to be straightened and stretched and compressed by mechanical equipment to meet the specified straightness requirements.
5. The square steel pipe after cutting and straightening needs to be cut according to customer requirements to obtain the required length of product.
6. After straightening and cutting, the square steel pipe may undergo certain deformation, and straightening treatment is needed to restore it to the specified shape.
7. Finished product inspection: Conduct quality inspection on the square steel pipes produced, including appearance inspection, dimensional measurement, mechanical performance testing, etc., to ensure that the products comply with relevant standard requirements.