The elements and the whole sets of construction design of the automatic steel-pipe electric welding machine were introduced. The composition of hardware and software of the systems were also designed.
介绍了其焊接原理及整机的构造设计方案，并给出了焊接过程控制系统的硬件构成和软件结构。
In the early 1980s, the Beijing urban construction design completed liquefied petroleum gas (LPG) mobile pneumatic rail welding technology research and application.
年代初，北京城建设计院等完成液化石油气移动式气压焊轨技术的研究和应用。
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