Production process of straight seam welded steel pipe
Time : 2025-03-06
Production process of straight seam welded steel pipe

Straight seam welded steel pipe is a steel pipe whose weld seam is parallel to the longitudinal direction of the steel pipe. It is cold-rolled or hot-rolled steel plate or steel strip coil welding during the production process, and then straight seam welding is carried out on the welding equipment to form a straight seam welded pipe.

The welding process of straight seam steel pipe is as follows:

1.Plate Inspection: Upon entering the production line, steel plates for large-diameter submerged arc welded straight-seam pipes undergo ultrasonic testing to ensure quality.

2.Edge Milling: The two edges of the steel plate are milled on both sides using an edge milling machine to achieve the required plate width, edge parallelism, and groove shape.

3.Pre-Bending: A pre-bending machine processes the plate edges to meet the specified curvature requirements.

4.Forming: The forming machine shapes the steel plate step-by-step. First, half of the pre-bent plate is pressed into a "J" shape, followed by the other half into a "C" shape, ultimately forming an open "O" shape.

5.Pre-Welding: The formed straight-seam pipe undergoes seam welding using continuous gas-shielded welding.

6.Internal Welding: The inner side of the pipe is welded using longitudinal multi-wire submerged arc welding, which can employ up to four wires for high efficiency.

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