Spiral steel pipe was made by steel ciol, extrusion forming under the normal temperature, take the technology of double wire and double-faced submerged-arc welded. Spiral steel pipe was mainly used in public waterworks, petrochemical industry, chemical industry, electric power industry, agricultural irrigation and urban construction etc. Big Diameter Annular Corrugated Flexible Metal PipeIt can produce welded pipe with larger diameter with narrow blank and different diameter with the same width blank. The double-sided submerged arc welding technology is adopted for the large-diameter spiral steel pipe. The submerged arc welding has the advantages of stable welding quality, high welding productivity, no arc light and little
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