… tubes and pipes (for example, welded, riveted or similarly closed), having circular cross-sections, the external …
Explanatory notes
… tubes and pipes (for example, welded, riveted or similarly closed), having circular cross-sections, the external … obtained, for example, by welding or riveting preformed, unclosed, tubular shapes produced from flat‑rolled products. … there is a raised bead of metal, the “weld bead”, which is clearly visible on the external surface of the finished …