Classification and Production Methods of Welded Steel Pipe

The welded steel pipe produced by the company is made of plate or hot rolled coil and so on, and it is formed and welded. The classification of pipes can be the result of different methods. Professionals consider whether the steel pipe is straight or spiral welding. Other people can divide the material into its purposes, such as mining, oil drilling, agriculture, or manufacturing.


One of the most common methods for classifying welded steel pipes is to see the process. In other words, the steel pipe is classified according to the production method and / or sub process. The results are divided into three classifications. These are:


Resistance welding (ERW): ERW is high frequency or low frequency. It is limited to the size of the maximum diameter of about 24 ". This type of welded steel pipe is the result of the longitudinal welding hot rolled coil.
Longitudinal (LSAW or DSAW): the main substrate of this method is the heavy steel plate. One of the two methods used by producers for submerged arc welding (SAW) and double submerged arc welding (DSAW). The resulting plate has a straight seam extending to the full length of the pipe. The standard size of the pipe ranges from 12 to 18 meters. With this method, the weld quality is high and the defects are few.
Spiral welding or spiral welding longitudinal: as the name shows, spiral welding is the result of circular motion. The manufacturer takes the steel plate and coils the HR coil or the base of the steel plate. This method is called the spiral submerged arc welding (HSAW). The products obtained are thicker and longer than other methods. In general, this approach is beneficial, as it proves to be simple, efficient, cost-effective and fast.
In any case, the market for welded steel pipes, manufacturers and distributors is still strong. Diversification is a means of maintaining profit consistency. Quality, meet or exceed the specifications of API and other organizations are essential to ensure the global competitiveness of manufacturers and distributors. The Kelly pipeline continues to provide customer expectations of high quality welded steel pipes, including OCTG and wide - stock wells.