Central Plains Spiral Welded Pipe
2022-05-07
Central Plains Spiral Welded Pipe It is manufactured by rolling low‑carbon structural steel or low‑alloy structural steel strips into a tube blank at a specific helical angle—known as the forming angle—and then welding the seam. This process allows the use of narrower steel strips and enables the production of large‑diameter steel pipes. Pipe dimensions are specified in terms of outside diameter × wall thickness. Welded pipes shall pass hydrostatic testing, and their welds must meet prescribed requirements for tensile strength and cold‑bend performance.
In processing Central Plains Spiral Welded Pipe At that time, weld seam machining is Central Plains Spiral Welded Pipe the nature of it. Weld seam machining is generally classified into three categories. Below, we will discuss weld seams during the machining process:
A type Central Plains Spiral Welded Pipe Welds: All welds in bifurcated pipes. 2. Longitudinal seams of steel pipe walls. 3. Circumferential seams of steel pipes. 4. Pinch‑welded closure of circumferential seams. 5. Welds between diaphragms and pipe walls. If these welds are inspected by ultrasonic testing, the inspection rate is 50%; for radiographic testing, the inspection rate is 5%, with a quality requirement of B1.
Category II Central Plains Spiral Welded Pipe Welds: the pipe‑wall joints of steel pipes; the butt welds of water‑stop rings and stiffening rings, as well as their combined welds with the pipe wall. If such welds are subjected to ultrasonic inspection, the random inspection rate shall be 50%, and the quality requirement is Class B2 acceptance.
Three categories Central Plains Spiral Welded Pipe Welds: The welds of auxiliary components are subjected to very low stresses and do not require shutdowns for power generation or water injection during maintenance.
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