This paper makes a systematic analysis on the defects of the sphere which easily happen in the course of erecting and welding and puts forward some corresponding control measurements.
文章对球罐在安装焊接过程中易产生的缺陷进行了系统的分析，并提出了相应的控制措施。
2
At present, there is not special technological criterion or specification in China for manufacturing and welding steel structure of railway bridge girder erecting machine.
目前，国内在铁路架桥机钢结构的制造及焊接工艺方面，还没有专门的规范或规程。
3
A base is formed by erecting and welding Angle irons, and terrestrial heat tubes are arranged under floors and are sealed through heat insulating layers.