ERW (Electric Resistance Welded) and LSAW (Long Seam Submerged Arc Welded) steel pipe are both one weld, but two different methods of making steel pipe. Their differences and advantages are as follows:
**Manufacturing method difference:
ERW steel pipes are made by heating steel strips with high-frequency current to weld them together. This method is suitable for small diameter steel pipes and has high production efficiency.
LSAW steel pipe is to bend the steel plate into a U shape, and then weld it with submerged arc welding with long seam to form a tube. This method is suitable for large-diameter steel pipes, and the production efficiency is low.
**Welding quality difference:
The welding quality of ERW steel pipe is better than that of LSAW steel pipe. Because the welding of ERW steel pipe is done at room temperature, there will be no thermal deformation and internal stress during the welding process, which makes the strength and corrosion resistance of the steel pipe better.
A large amount of internal stress will be generated during the welding process of LSAW steel pipe, so cold expansion or heat treatment is required to eliminate internal stress, otherwise the strength and corrosion resistance of the steel pipe may be affected.
**Production efficiency and cost difference:
ERW steel pipe has high production efficiency and can be produced continuously. Due to the simple production equipment, the production cost is relatively low.
The production efficiency of LSAW steel pipe is low and requires larger production equipment. Due to the complicated production process, the production cost is relatively high.
Therefore, there are obvious differences between ERW steel pipes and LSAW steel pipes in terms of manufacturing methods, welding quality, production efficiency and cost. Which steel pipe to choose should be determined according to the specific use requirements and conditions.
