Welded pipe is a round pipe that has been electrically welded with raised weld seam inside the pipe. It is a structural grade tube appropriate for a broad range of applications where dimensional accuracy and precision tolerances are not of highest concern. The difference between seamless pipes and welded pipes are mainly the different in molding process where welded pipes are generally though the flat plate by welding after the bending. There are 4 class of welded pipes, which consists of ‘AA', 'A', 'B' and 'C'