In general, large-diameter welded pipe used in industrial and civil construction electrical, plumbing, fire protection and supporting structure are widely used. Because of this pipe making, using rolled strip, winding shape, along this line weld process, and therefore they should not customarily referred to as "high-frequency welded pipe."
Longitudinal as large diameter pipes are used, generally spiral welding production process, avoiding the Longitudinal defects, but also the pipe material weldability indicators affecting product quality is a major factor. Longitudinal in the production of large diameter, because of its large size jokes by processing machinery and processes, the effects will inevitably have some defects such as concentricity goods, smooth surface, surface finish appearance of these targets.
Relatively speaking, small diameter pipe, using this technology production, technology is relatively simple, relatively easy to control defects, and a large-diameter welded tube was difficult to control, prone to cavities, weld, welding defects and other indicators, and may exceed originally expected.
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