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。

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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。

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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.

底座采用角铁架设焊接而成，在地板的下面设有地热管、通过隔热层将地热管密封。

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