Manufacture and use of ERW tube
Steel tube starts out as flat steel strip that has been slit to the correct width for the end tube size. It is then passed through a series of rolls that form it into a round tube. After the steel has been formed it passes through a weld box. The weld box for ERW tube uses electrical resistance of the steel tube to create heat. This heat is what welds the two steel edges together. Using this method will produce a strong weld that is just as strong as or stronger than the original steel. After welding the surface left behind, known as flash is removed if there is a requirement to do so. After the flash control process the tube travels through a cooling box that is filled with special coolant. Once the tube leaves the cooling box it now goes through a group of finishing rolls. These finishing rolls are used to change the shape of the tube and make the final dimensions. Common shapes include: round, square, rectangle, oval, & octagonal. Following the finishing process the tube i...