sirgservaga ribatoorikust, mille kokkusurutud otsad keevituvad või keevitatakse, valmistatud keevistoru (vt keevistoru; vrd ülekatteliideskeevistoru), tube made by drawing mild steel strip through a bell-shaped die, so that the strip is coiled into a tube, the edges being then pressed together and welded (see: welded tube; compare: lap-welded tube)