High-frequency welded pipes, also known as HFW pipes, are manufactured from hot-rolled coils. The production begins with the coils being shaped by a forming machine, after which high-frequency electric currents are applied. This method utilizes the skin effect and proximity effect of the electric current to heat the edges of the pipe until they melt. When the molten edges come into contact, they are fused together under pressure via squeeze rollers, resulting in a solid, continuous pipe.

The advantage of high-frequency welded pipes lies in their ability to produce pipes with a smooth, high-quality seam, resulting in excellent mechanical properties. They are often used in applications where strength and reliability are paramount, such as in oil and gas pipelines, structural supports, and various other industrial sectors.

Straight Seam Welded Pipes

Straight seam welded pipes encompass a broader category of welded pipes, which includes both double-sided submerged arc weld (DSAW) pipes and high-frequency resistance welded (ERW) pipes. Straight seam welded pipes can be further categorized based on their manufacturing methods, which include UOE (U-shaped, oval-shaped, and expanded), RBE (Roll Bending Equipment), and JCOE (J-Curve, being an alternative shaping method). This diversity in forming techniques allows for a wide range of pipe sizes and thicknesses, making straight seam welded pipes versatile for various engineering needs, including transportation of fluids and gases, construction, and structural applications.

In conclusion, while both high-frequency welded pipes and straight seam welded pipes belong to the family of welded pipe products, they exhibit distinct manufacturing processes and properties. High-frequency welded pipes are particularly known for their strong seams and specific application in demanding environments. In contrast, straight seam welded pipes, with their various manufacturing techniques, offer flexibility to engineers and customers seeking tailored solutions.