Cangzhou Spiral Steel Pipe Factory: Introduction to Welding Repair Methods for Spiral Welded Pipes
2022-05-07
Processing and welding of spiral welded pipes: Prior to welding, remove rust, oil, water, paint, and any other contaminants that could adversely affect the weld. Select electrodes appropriate for the steel grade. The inter‑spot‑welding time interval should be shorter than that used for carbon steel; therefore, a spiral-welded-pipe brush must be employed when removing slag. After welding, to prevent localized corrosion or loss of strength, the surface should be ground or cleaned.
As spiral welded pipes become increasingly widespread, the technical requirements and the demand for product diversification are steadily rising. Consequently, the number of manufacturers in this market is also growing. Overall, it is clear that this type of pipe is highly practical, chosen for use in critical production sectors. Numerous factors must be taken into account. Compared with conventional pipes, spiral welded steel pipes are hollow—making them a hollow‑section material. In industry, they are not only employed in mechanical manufacturing; they also serve as an essential component in pipeline transportation. It is evident that spiral welded steel pipes enjoy high utilization rates across a wide range of applications.
Cutting and Stamping: Spiral-welded pipes are stronger than conventional materials, requiring higher pressures for stamping and shearing. The clearance between the cutting tools must be precise to prevent shearing and work hardening. Plasma or laser cutting is preferred. When gas cutting or arc cutting is necessary, the heat-affected zone should be ground down and subjected to heat treatment.
Bending in the fabrication of spiral welded pipes: Sheet metal can be bent. 180 However, to minimize cracking on the curved surface, the radius is set to twice the thickness. For thick plates, the thickness-to-radius ratio is specified twice along the rolling direction, with the bending direction perpendicular to the rolling direction. The plate thickness must be provided. 4 Double the radius, especially in the case of welding. To prevent cracking during machining, the surface of the weld area should be ground.
The crack‑repair welding method for spiral welded pipes is a type of stainless‑steel heat‑resistant welding. It boasts excellent oxidation resistance and corrosion resistance, making it widely used in alkali pipelines for ion‑membrane electrolysis. However, due to the stringent technical requirements of the material, any deficiencies—such as incomplete alloying elements in the base metal, inadequate filler materials, improper welding procedures, adverse operating conditions, corrosive media within the pipeline, or residual working stresses—can give rise to serious defects and pose significant safety risks. Therefore, crack repair represents an effective maintenance approach.
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