Which one is better, seamless pipe or welded pipe? The difference between the two is as follows: :
The process is different. Seamless pipes are made by perforating steel billets or solid tube embryos; welded pipes are made by bending and welding steel plates or strips.
The appearance is different. There are no seams on the surface of seamless pipes; there are generally welded seams on the surface of welded pipes.
Wall thickness is different. Seamless pipes have low precision and relatively thick wall thickness; welded pipes have high precision and usually have thin wall thickness.
The raw materials are different. Seamless pipes use steel billets or solid tube embryos; welded pipes use steel plates or strips.
Performance is different. Seamless pipes are better than welded pipes in terms of corrosion resistance, pressure bearing, and high temperature resistance.
Prices vary. Seamless pipes are more expensive than welded pipes because the production process of seamless pipes is more complex and their costs are higher.
| Seamless Pipe | Welded Pipe | |
| Process | Formed from solid round steel billet, hot rolled or cold drawn | Formed by welding steel plates or steel strips together |
| Appearance | No visible seam on the outside surface | Visible weld seam on the outside surface |
| Wall Thickness | Typically thicker with less precision | Typically thinner with higher precision |
| Raw Material | Solid round steel billet | Steel plates or steel strips |
| Performance | Better corrosion resistance, pressure and temperature tolerance | Lower corrosion resistance, pressure and temperature tolerance compared to seamless pipe |
| Price | More expensive due to more complex manufacturing process | Cheaper due to simpler manufacturing process |
| Applications | Used in high-pressure, high-temperature, and corrosive environments | Used in low-pressure fluid transportation applications |
