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.
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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