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Publisher：Jiangsu Farrand Metal Products Co., Ltd. Release time：2025-07-08 11:34:57 Number of clicks： Close

Firstly, small-diameter stainless steel welded pipes are produced continuously online. The thicker the wall thickness, the greater the investment in the production line and welding equipment, and the less economical and practical it becomes. The thinner the wall thickness is, the lower the input-output ratio will be accordingly. Secondly, the manufacturing process of this product determines its advantages and disadvantages. Generally, welded steel pipes have high precision, uniform wall thickness, high brightness of the inner and outer surfaces (the surface brightness of the steel pipe is determined by the surface grade of the steel plate), and can be customized to any length. Therefore, it demonstrates its economy and aesthetics in high-precision, medium and low-pressure fluid applications. According to the welding technology, it can be divided into automatic welding and manual welding. Automatic welding generally employs submerged arc welding and plasma welding, while manual welding typically uses argon arc welding. According to the form of the weld seam, they are classified into straight seam welded pipes and spiral welded pipes. According to their uses, they are further classified into general welded pipes, heat exchanger pipes, condenser pipes, galvanized welded pipes, oxygen-blowing welded pipes, electrical conduit pipes, metric welded pipes, idler pipes, deep well pump pipes, automotive pipes, transformer pipes, thin-walled electric welded pipes, special-shaped electric welded pipes and spiral welded pipes
Straight seam welded pipe forming process
1. Plate inspection: After the steel plates used to manufacture large-diameter submerged arc welded straight seam steel pipes enter the production line, they first undergo full-plate ultrasonic inspection.
2. Edge milling: By using an edge milling machine, both edges of the steel plate are milled on both sides to achieve the required plate width, edge parallelism and bevel shape.
3. Pre-bent edge: Use a pre-bending machine to pre-bend the edge of the plate to ensure it has the required curvature.
4. Forming: On the JCO forming machine, first, half of the pre-bent steel plate is pressed into a "J" shape through multiple step-by-step stamping processes. Then, the other half of the steel plate is bent in the same way and pressed into a "C" shape. Finally, an open "O" shape is formed
5. Pre-welding: The formed straight seam welded steel pipe is joined together and continuous welding is carried out using gas shielded welding (MAG).
6. Internal welding: Longitudinal multi-wire submerged arc welding (up to four wires) is used to weld on the inner side of the straight seam steel pipe.
7. External welding: Longitudinal multi-wire submerged arc welding is used to weld on the outside of the straight seam submerged arc welded steel pipe.
8. Ultrasonic Inspection I: Conduct 100% inspection of the inner and outer welds of straight seam welded steel pipes and the base metal on both sides of the welds.
9. X-ray Inspection I: Conduct 100% X-ray industrial television inspection on both inner and outer welds, and use an image processing system to ensure the sensitivity of flaw detection.
10. Diameter expansion: The entire length of the submerged arc welded straight seam steel pipe is expanded to enhance the dimensional accuracy of the pipe and improve the distribution of internal stress within the pipe.
11. Hydrostatic test: Each expanded steel pipe is inspected one by one on the hydrostatic testing machine to ensure that the steel pipe meets the test pressure required by the standard. This machine has the functions of automatic recording and storage.
12. Chamfering: After the steel pipes have passed the inspection, the pipe ends are processed to meet the required bevel dimensions of the pipe ends.
13. Ultrasonic Inspection II: Conduct ultrasonic inspection on each straight seam welded steel pipe again to check for possible defects that may occur after expansion and water pressure.
14. X-ray Inspection II: Conduct X-ray industrial television inspection and take X-rays of the weld seams at the pipe ends on the steel pipes after expansion and hydrostatic testing.
15. Magnetic particle inspection at pipe ends: This inspection is carried out to detect defects at pipe ends.
16. Anti-corrosion and coating: The qualified steel pipes shall be subject to anti-corrosion and coating as per the user's requirements.
Jiangsu Farrand Metal Products Co., LTD
Contact Person: Manager Xu
Contact number: 13812545666
After-sales service: 0510-83923185
Email: 799743000@qq.com
Website: www.boismarinecreation.com
Address: No. 8-1, Jingxin Road, Xibei Town, Wuxi City, Jiangsu Province

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