A welded pipe is made of long ribbon steel known as “skelp”. Skelp is cut into a flat rectangular sheet with a specific length. The rectangular sheet is then undergoing the ERW process where a rolling machine curls the long side towards one another. A cylinder is formed as a high-frequency voltage pass through the cylinder, resulting in it melting and fusing together. Welded pipes are customized to meet an extensive range of application requirements such as material grades and pressure.