There are two types of welded steel pipes: straight-seam welded and spiral welded. Welding methods include high-frequency welding and arc welding. High-frequency welded pipes are generally straight-seam welded, but straight-seam welded steel pipes are not necessarily high-frequency welded.

High-frequency welded steel pipes are produced by rapidly heating and melting the edges of the steel pipe with high-frequency current, followed by welding under the action of extrusion rollers. This process is characterized by fast welding speed and a small heat-affected zone, thus ensuring the overall performance of the steel pipe. Due to the rapid heating and extrusion by high-frequency current, the weld is of high quality, high strength, and has a smooth appearance, making it less prone to welding defects.

Straight seam welded steel pipes, on the other hand, use welding rods or welding wires to directly weld the joints of the steel pipes. The welding process is relatively slow and the heat-affected zone is large. The weld seam of straight seam welded steel pipes is relatively rough, and the weld strength may be affected by the welding process and the quality of the welding rod, resulting in certain quality fluctuations.

High-frequency welded steel pipes have better corrosion resistance and compressive strength due to their fast welding speed and small heat-affected zone. At the same time, high-frequency welding process can also ensure the dimensional accuracy and shape stability of steel pipes. Straight seam welded steel pipes may be slightly inferior in terms of performance, especially in terms of corrosion resistance and compressive strength.

High-frequency welded steel pipes are produced by rapidly heating and melting the edges of the steel pipe with a high-frequency current, followed by welding under the action of extrusion rollers. This process is characterized by high welding speed and a small heat-affected zone, thus ensuring the overall performance of the steel pipe. Straight seam welded steel pipes, on the other hand, use welding rods or wires to directly weld the joints of the steel pipe. The welding process is relatively slower, and the heat-affected zone is larger.

High-frequency welded steel pipes, due to the rapid heating and extrusion by the high-frequency current, have high-quality welds with high strength and a smooth appearance, making them less prone to welding defects. The high welding speed and small heat-affected zone also give the steel pipes better corrosion resistance and compressive strength during use. Furthermore, the high-frequency welding process ensures the dimensional accuracy and shape stability of the steel pipe.

In contrast, the welds of straight seam welded steel pipes are relatively rough, and the weld strength may be affected by the welding process and the quality of the welding rods, resulting in some quality fluctuations. Straight seam welded steel pipes may be slightly inferior in terms of performance, especially in terms of corrosion resistance and compressive strength.

Choose high-frequency welded pipe: When you need small to medium diameter, thin-walled, low-cost, high-efficiency pipelines for general transportation or structural support.

Choose straight seam submerged arc welded pipe: When you need large diameter, thick-walled pipes that withstand high pressure or high stress, and where the requirements for weld quality and reliability are extremely high, such as oil and gas trunk lines and large-scale engineering structures.

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