The results show that the weldments made from those metals in as-welded condition are instable in dimension and the rate of dimensional change decreases with time.
结果表明：七种材料的焊件都存在着尺寸不稳定，这种尺寸不稳定变形随时间的变化速率逐渐变缓；
Milling machine application in welded pipe production line will greatly improve the edge condition of strip steel.
铣边机在焊管生产机组上的应用将大大改善钢带的边缘状况。
The technical condition of steel used in high-pressure natural gas transmission pipeline and the productive technique and feature of the welded pipe used in the pipeline is discussed.
对国外高压输送天然气管线用钢的技术条件，管线用焊管的生产工艺和生产特点作了论述。
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