| 摘要 |
<p>The support has two parallel sides (2), each having an arrangement of openings of different predetermined diameters (4). The openings allow a passage of a tube of preset diameter and maintain the tube in position to effect a welding operation. An arrangement of cylindrical projections (5) with different predetermined diameters is placed on a third side (3) perpendicular to the two sides (2).</p> |
