Thin-wall welded coil and method for producing the same

Abstract

The invention discloses a production method of the thin-walled welded coil. The production method includes the steps of selecting materials, making a pipe, coiling the pipe, and performing cutting and packaging. The thin-walled welded coil made by the production method comprises a coil made by coiling a welded pipe greater than 1.8% and less than or equal to 3% in wall-diameter ratio; the diameter D of a circle of center of the coil is 800 mm to 1500 mm, the diameter D1 of an outer circle of the coil is 1200 mm to 2000 mm, a number of coiling layers is 6 to 20, and a number of coiling turns of each layer is 25 to 48, and extension length of the coil is 600 m to 1800 m. The production method has the advantages that the problems in terms of processing design and transporting cost are solved, utilization of welded pipes is increased, the use of an automatic pipe discharging mechanism decreases labor intensity and allows automatic pipe discharging, a coiling roller in a telescopic type may be adjusted according to different specifications of welded pipes, and the problems that the inner wall of a pipe suffers from wrinkling, deformation and the like during coiling due to too small inner diameter of the coil are avoided effectively.

Description

technical field [0001] The invention relates to a welded pipe and its production method, in particular to a thin-wall welded coiled pipe and its production method. Background technique [0002] Thin-walled welded pipes mainly include titanium welded pipes, stainless steel welded pipes, nickel-based alloy welded pipes, etc. The thin-walled welded pipes refer to welded pipes whose wall-to-diameter ratio (the ratio of wall thickness to outer diameter) is greater than 1.8% and less than or equal to 3%. The welded pipe is mainly used in heat exchangers, evaporators and condensers in marine engineering, seawater desalination, electric energy, petrochemical, air cooling, swimming pools, underwater farming and other devices. At present, in order to meet the needs of different fields, the strip on the production line is uncoiled by the welded pipe unit, rolled into rolls, welded, on-line heat treated, sized, eddy current flaw detected, and on-line sprayed. Tubes, when delivering, bu...

AI Technical Summary

Problems solved by technology

At present, in order to meet the needs of different fields, the strip on the production line is uncoiled by the welded pipe unit, rolled into rolls, welded, on-line heat treated, sized, eddy current flaw detected, and on-line sprayed. Tubes, when delivering, bundle a number of welded straight tubes and transport them to the customer by transport vehicle. In this way, when the length of the customer is not considered properly, the utilization rate of the product will be greatly reduced. At the same time, when the length of the welded straight tube exceeds When it is more than 15 meters, the transportation difficulty and cost will be greatly increased, and in the transportation process of this method, the welded straight pipe is easy to bump, which affects the quality of the welded straight pipe

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