Causes of Certain Issues in Spiral Pipe Production
Release date:
2022-02-11
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What are the common causes of production problems in spiral pipes? During smelting or hot working, certain factors—such as non-metallic inclusions, gases, improper process selection, or incorrect operating procedures—can give rise to internal or surface defects in the steel. These defects severely compromise the quality of the material or finished product and may even result in scrap.
What are the common causes of production problems in spiral pipes? During smelting or hot working, certain factors—such as non-metallic inclusions, gases, improper process selection, or operator error—can give rise to internal or surface defects in the steel, which severely compromise the quality of the material or finished product and may even result in scrap.
Common Defects and Their Causes in Spiral Welded Steel Pipes: Macroscopic examination can reveal porosity, blowholes, shrinkage cavity remnants, non-metallic inclusions, segregation, white spots, cracks, and various abnormal fracture defects. There are two types of macroscopic inspection: acid‑etching and fracture‑surface examination. The following is a brief overview of the common macroscopic defects revealed by the acid‑etching method:
1. Causes of spiral tube separation:
During the solidification process of casting, selective crystallization and diffusion can lead to the segregation of certain elements, resulting in chemical non-uniformity. Depending on the location of the segregation, it can be classified into ingot segregation, center segregation, and point segregation.
Overall characteristics
From a macroscopic perspective, the acid‑leached samples exhibit a dark color, an irregular shape, slight depressions, and a flat base. When they are separated into etchable or gas‑inclusion phases, numerous dense microporous spots become apparent. If the sample is a corrosion‑resistant component, its color will be lighter, its morphology more irregular, and its slightly raised features will appear smoother.
2. Causes of porosity in spiral tubes
During hot working, gaps caused by the solidification shrinkage of low-melting-point materials and the release of gases prevent steel from being welded. Based on their distribution patterns, these gaps can be classified into two types: center‑management type and general‑loose type.
Overall characteristics
On the laterally hot-acid‑etched surface, the pores exhibit irregular polygonal shapes with narrow pits at their bases; this distinct pit morphology typically correlates with greater segregation, and in severe cases, the pits tend to coalesce into a sponge‑like structure.
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