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Difference between Seamless and Welded Pipes and Tubes

1, Seamless pipes don’t have a weld seam. Traditionally, the seam of welded pipes has been viewed as a weak spot, vulnerable to failure and corrosion. However, improvements in the manufacturing process for welded pipes have increased the strength and performance of the weld seam. Still seamless pipes prevent any possibility of a weak seam. In general, welded steel pipes can withhold 20% less working pressure than seamless ones.

2, Seamless pipes has higher working pressures compared to welded pipes of the same material and size due to having no welded seam.
3, Seamless pipes offers superior corrosion resistance because it has little potential for impurities, defects and differences in malleability that may be associated with the welded area in welded pipe.
4, Seamless pipes do not require testing for weld integrity. This is a must for welded pipes.
5, Seamless pipes harden as they are manufactured, so heat treatment after manufacturing is not required. Most welded pipes require heat treatment after manufacturing.
6, The cost of welded pipes is less expensive than seamless pipes and is readily available in long continuous lengths.
7, Seamless pipes can be substituted for welded pipe but welded pipes may not always be able to be substituted for seamless pipe due to the weld seam.
8, The wall thickness of welded pipes is generally more consistent than that of seamless pipes. Its easier to get a uniform thick flat strip and produce a welded pipe than drawing a uniformly thick seamless pipe through extrusion. Also welded pipes surface finish quality is much better than seamless pipes.
9, Longer procurement lead time is required for seamless pipes as compared to welded pipes.