Understanding the differences between High-Frequency Weld (HFW) and Submerged Arc Weld (SAWL) pipes is crucial for selecting the right material for your project. As an API 5L X65 line pipe distributor, we aim to provide clarity on these two welding processes.
HFW Welds
- Production Process: HFW is a type of Electric Resistance Weld (ERW) that uses high-frequency current, typically above 70 kHz, to generate heat. This high-frequency current is passed through the edges of the strip steel, causing them to heat up and melt.
- Size Range: Generally produced up to 24 inches OD.
- Applications: Favored for precision and cost-effectiveness, used in applications requiring high-quality welds but smaller pipe sizes.
SAWL Welds
- Production Process: Uses submerged arc welding, where plates are formed into a cylindrical shape and then submerged arc welded together using a large amount of flux to cover the weld. This prevents oxidation and ensures a clean weld.
- Size Range: Typically produced with an outer diameter (OD) of 16 inches and above.
- Applications: Generally used in higher pressure applications. SAWL can be produced in heavier walls and larger ODs, making it a prime candidate for oil and gas pipelines over long distances.
In summary, HFW pipes are produced using high-frequency welding, resulting in excellent dimensional accuracy and cost-effectiveness for smaller pipe sizes. SAWL pipes, on the other hand, use submerged arc welding, ensuring deep penetration and high-quality welds for larger diameter pipes, making them ideal for high-pressure applications and long-distance pipelines.
Ultimately, your needs will determine whether HFW or SAWL material is suitable for your project. For us, we mainly lean into heavy wall and larger ODs, so most of our welded inventory is SAWL.
We hope this helps! If you have any other questions, feel free to reach out to us today!