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。
Due to various causes such as leakage, damage or alteration, expansion, gas facilities inevitably need fire works such as electric welding and gas welding.
燃气设施使用一段时间后，由于各种原因造成漏气、损坏或需要改建、扩建，不可避免动用电焊、气焊等方法进行动火补焊、碰接及改造。
Energy-saving design, welding stop, gas, circuit and electric automatically close.
节能设计，焊接停止，气路、电路自动关闭。
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