介绍了大型管网施工工艺程序和混合型立向下焊焊接工艺原理。
Construction technology of large-scale pipeline and mixing type vertical downwards-welding technology is introduced.
给出了这些管段焊口的坡口形式、焊接方法、焊接材料、焊接工艺参数及实焊工艺程序。
The groove shapes, welding methods, filling materials, procedure parameters and concrete welding sequence are provided.
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