Seamless vs. Welded Pipes: A Comparative Study Pipes are integral to numerous industries, with their applications ranging from the transportation of water, oil, gases to construction. There are two primary types of pipes - seamless and welded, each with its unique manufacturing process, characteristics, and uses.To get more news about Steel pipe, you can visit friend-steelpipes.com official website. Manufacturing Process Seamless Pipes are made from a solid round steel billet heated and stretched out over a form. The process involves piercing through the center with a die and mandrel, which increases the inside diameter and reduces the outside diameter. On the other hand, Welded Pipes are made by cold forming flat strips, sheets, or plates into a round or circular shape by a roller or plate bending machine. The pipe is then welded with or without filler material using a high-energy source. Strength and Length Seamless pipes can withstand more pressure and load as there is no weak seam. However, they are relatively shorter in length due to manufacturing difficulties. Welded pipes, believed to withstand 0% less pressure and load compared to seamless pipes, can be manufactured in long continuous lengths. Size and Corrosion Resistance Seamless pipes are usually manufactured for a nominal size of 4 inches or less. They are less prone to corrosion, making them more corrosion-resistant. Conversely, welded pipes do not have any size restriction on production, but their weld areas are more prone to corrosion attacks, which means less corrosion resistance. Surface Quality and Economy Seamless pipes have a rough surface due to the extrusion process, while welded pipes have a smooth high-quality surface. Seamless pipes are costlier than welded pipes due to their complex production process and long procurement lead time. Conclusion In summary, both seamless and welded pipes have their advantages and disadvantages. The choice between the two depends on the specific requirements of the application. Seamless pipes offer higher strength and better surface finish but are more expensive than welded pipes.