Could I use welded steel pipe instead of seamless steel pipe in Structural using?

Structural  steel pipe in theory should be the same between welded steel pipe and seamless steel pipe, the difference is not very big, straight seam welded steel pipe is better than rules, centroid welded pipe may not in the center, pay particular attention to, when used as a compression member so welded pipe relatively high probability of weld defects, for important parts of the seamless pipe, seamless pipe in the wall thickness not limited by the processing technology can do is very thin (same diameter seamless pipe wall thickness on average than welded pipe thickness), in many cases efficiency than welded pipe seamless tube material, especially the large diameter pipe.

Seamless pipe and welded steel pipe is the biggest difference in the pressure on the gas or liquid transmission (DN).