Bosed on economic comparability the consumption of materials and the price of welding and seamless pipe are compared under the different producing process.
在经济可比性的范围内，分析生产焊接钢管和无缝钢管时，各类不同工艺流程条件下的物料消耗构成和价格比较。
Cross sector seamless line, namely rail bar, rail bar and rail switch direct welding; the vertical force and displacement are direct transmitted between rail bars.
跨区间无缝线路，即轨条与轨条、轨条与道岔直接焊接，轨条之间直接传递纵向力和位移。
Cross sector seamless line, namely rail bar, rail bar and rail switch direct welding; the vertical force and displacement are direct transmitted between rail bars.
跨区间无缝线路，即轨条与轨条、轨条与道岔直接焊接，轨条之间直接传递纵向力和位移。
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