Welded Pipes are manufactured from Plate or continues Coil or strips. To manufacture welded pipe, first plate or coil is rolled in the circular section with the help of plate bending machine or by a roller in the case of continues process. Once the circular section is rolled from the plate, the pipe can be welded with or without filler material. Welded pipe can be manufactured in large size without any upper restriction. Welded pipe with filler material can be used in the manufacturing of long radius bends and elbow. Welded pipes are cheaper with compared to the seamless pipe and also Weak due to the weld.
Welded pipes are divided into four types according to different welding methods.
ERW- Electric Resistance Welding
EFW- Electric Fusion Welding
HFW- High-frequency welding
SAW- Submerged Arc Welding (Long seam & Spiral Seam)