Man-made static magnetic fields are generated wherever DC currents are used, such as in electric trains or industrial processes such as aluminium production and in gas welding.
在使用直流电的地方即产生人为的静电磁场，例如在电车或诸如铝生产和气焊等工业操作程序中。
2
The development process and functions of a "Compiling expert system" for welding technology on electric locomotives are described.
介绍一种用于电力机车的焊接工艺制定专家系统的开发过程及功能。
3
The composition elements, technical process and quality inspection of handicraft tin welding in the process of low-voltage electric harness for automobile are introduced in this paper.