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Spiral welded pipe or Helical welded pipe is cold formed from hot rolled coil and submerged arc welded in a single, continuous process
Welded pipe is formed by rolling plate and welding the seam (usually by Electric resistance welding)
A tube is a closed shape used to perform some structural function.
Seamless pipe as the name suggests is a pipe without a seam or a weld-joint in contrast to Seam or Welded pipe.