Let’s discuss the differences between spiral-welded pipes and precision welded pipes.

19 Dec,2022

Let’s discuss the differences between spiral-welded pipes and precision welded pipes.

　　Let’s talk about spiral tubes and… Precision welded pipe The difference

　　In fact, spiral welded pipes and precision welded pipes are both types of welded pipes. They are widely used in national economic development projects; however, due to differences in their manufacturing processes, they exhibit numerous distinctions.

　　Next, we will examine the differences between spiral-welded pipes and precision welded pipes.

　　First, the strength of spiral-welded steel pipes is generally higher than Precision welded pipe High—specifically, the production process involves arc welding. Spiral‑welded pipes can be manufactured from billets of uniform length, yielding pipes with varying diameters; for example, small‑diameter spiral pipes can be produced this way. Conversely, larger‑diameter welded steel pipes can be made from narrow forged billets. The manufacturing process for straight‑seam steel pipes is relatively straightforward, with key methods including high‑frequency welded straight‑seam pipes and arc‑welded scaffolding pipes. Scaffolding pipe production offers high efficiency, low costs, and rapid development.

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　　Therefore, in a more straightforward manner Precision welded pipe Most applications employ straight‑seam welding, while large‑diameter welded pipes are predominantly manufactured using spiral welding. In the industry, when producing large‑size casing pipes, T‑joint welding is often used: short, precision‑welded pipe sections are joined end to end to achieve the required project length. However, this approach also increases the likelihood of defects in T‑joint welds, and the weld zones exhibit significant residual stresses; moreover, the weld metal typically experiences triaxial stress conditions, thereby elevating the risk of cracking.

　　Scaffolding pipes belong to the category of high-frequency welded steel pipes—commonly referred to as precision welded pipes—and are seamless steel tubes manufactured by rolling steel strips into shape and then electrically welding them together.

　　The manufacturing process for scaffolding pipes is simple, with high production efficiency, a wide range of sizes and specifications, and relatively low equipment investment. However, their typical compressive strength is lower than that of seamless pipes, though they are more affordable and well suited for on‑site scaffolding applications. Since the 1930s, thanks to the rapid advancement of high‑quality hot‑rolled strip steel mills and the development of welding and inspection technologies, weld quality has steadily improved, and the variety of welded pipe types and sizes has grown, leading to their increasing replacement of seamless pipes across an expanding array of industries. Hot‑dip galvanized steel pipes are classified according to their welding method into straight‑seam welded pipes and spiral‑welded pipes.

　　Spiral-welded steel pipes generally have higher strength than straight-seam welded pipes. They can be manufactured from narrow billets to produce pipes with relatively large diameters, and the same‑length billets can also be used to make welded pipes of varying diameters. However, compared with straight‑seam pipes of the same length, spiral‑welded pipes exhibit lower production efficiency. Consequently, for smaller‑diameter welded pipes, straight‑seam welding is typically preferred, while large‑diameter welded pipes are predominantly produced using spiral welding.

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