What is ERW? What are the categories of ERW and what are the characteristics of ERW?

ERW is the general term of welded steel pipe, which refers to the seamless steel pipe produced by rolling the thick steel plate into a round steel pipe or a square steel pipe and being welded by electric welding. Widely used in hydropower stations, municipal engineering drainage pipes, drinking water transportation and other engineering projects.

ERW is the general term of {EID ear tag}, which refers to the seamless steel pipe produced by rolling the thick steel plate into a round steel pipe or a square steel pipe and being welded by electric welding. Widely used in hydro-power stations, municipal engineering drainage pipes, drinking water transportation and other engineering project.

In the specific production and application, the ERW is generally divided into straight seam ERW and spiral ERW according to the welding method.

Straight seam ERW: generally for the outer diameter of DN15 (4 in charge) -DN150 (6 inch pipe). The straight seam welding process is simpler than the spiral welding process, and the electric welding is low cost, high efficiency. The defect is that the weld is on the same parallel line and the tensile strength is low, so the straight seam welding is only suitable for the application of the ERW in the production and manufacturing.

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Spiral ERW: generally welded with large diameter of DN200 (8-inch pipe) -DN600 (24-inch pipe). Spiral welding process can use the same total width of thick steel plate manufacturing different pipe by the welding pipe, defect is complicated, the same length of welding pipe spiral weld looks more than straight weld, lead to high product cost, low productivity, so the spiral welding is common in large diameter welding pipe manufacturing, another spiral weld has high tensile strength, to ensure the large diameter welding capacity.

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The metrological verification method of ERW is generally weighing and weighing, weighing according to the specific weighing weight, the meter is to obtain the net weight according to the basic theory calculation formula, formula calculation is: "meter weight (Kg) = (diameter mm-wall thickness mm) * wall thickness mm * 0.02466".