Large diameter steel pipes, for use in gas or liquid supply pipelines, are made up of curved steel sections whose ends are bent inwards in radial direction and welded together so that weld is inside pipe
摘要
<p>Large diameter steel pipes, for use in gas or liquid supply pipelines, are made up of curved steel sections (1). The ends (2) of these are bent inwards in a radial direction and welded together so that the weld is inside the pipe.</p>
