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What’s the difference between seamless elbows and welded elbows?
Release time:
Feb 26,2021
Speaking of elbows, we all know that they’re pipe fittings used at pipe bends—and they account for a significant proportion of all pipe fittings employed in piping systems. The elbows we use in our daily lives are seamless elbows. I’m sure many of you have asked this question: What’s the difference between seamless and welded elbows? And how can we tell them apart? Next, Longsheng Pipe will reveal the answer to you.
Speaking of elbows, we all know that they are pipe fittings used at pipe bends and account for a significant proportion of all fittings used in piping systems. The elbows we use in our daily lives are all seamless elbows. I’m sure many people have this question: What’s the difference between seamless elbows and welded elbows? How do we distinguish them? Next, Longsheng Pipeline will tell you the answer.
1. Different raw materials: Seamless elbows are made by pushing seamless pipes, while welded elbows refer to butt-welded elbows and straight-seam elbows.
2. Different appearances: Butt-welded elbows have two weld seams, straight-seam elbows have one weld seam, and seamless elbows have no weld seams.
3. Different performance characteristics
Compared to welded elbows, seamless elbows have the following advantages:
( 1) Hygienic and non-toxic. The material is composed entirely of carbon and hydrogen, with no toxic heavy-metal salt stabilizers added. Its hygienic performance has been verified by tests conducted by a nationally recognized authority.
( 2) Lightweight. The density of stamped elbows is 0.8–0.91 g/cm³, only one-tenth that of steel pipes. Due to their light weight, they can significantly reduce industrial transportation costs and the intensity of installation and construction work.
( 3) Good heat resistance. When the operating water temperature is 70°C, the softening temperature of the seamless elbow is 140°C.
( 4) Excellent corrosion resistance. With the exception of a few hydrogenating agents, it is resistant to corrosion by various chemical media, including acids, alkalis, and corrosive substances. It does not rust, corrode, harbor bacteria, or undergo electrochemical corrosion.
( 5) Good thermal insulation performance. Due to the material’s low thermal conductivity—ranging from 0.21 to 0.24 W/m·K at 20°C—which is significantly lower than that of steel pipes and copper pipes, seamless elbows exhibit excellent thermal insulation properties.
( 6) Excellent impact resistance. Thanks to its unique impact strength performance, it significantly outperforms other solid-wall pipes; its ring stiffness is equivalent to 1.3 times that of solid-wall pipes.
( 7) Long service life. Under rated temperature and pressure, the pipe’s service life exceeds 50 years.
4. Different prices: Due to the more complex manufacturing process of seamless elbows, their cost is higher than that of welded elbows. Welded elbows are primarily made by secondarily welding steel plates (steel strips), making them cheaper and widely applicable.
5. Different applications: Seamless elbows are primarily used as pipelines or structural components for conveying fluids, with main applications in the machinery industry. Welded elbows are mainly used in the construction industry—for example, for transporting water, natural gas, compressed air, and other low-pressure fluids. It’s worth noting that seamless elbows are always used for pressurized pipelines.
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