铁路电焊“花木兰”
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焊接过程中产生的电弧温度达到4200℃以上，常人无法直视。
The arc temperature produced in welding is above 4,200 degrees Celsius, and people cannot look straight at it with the naked eye. [Photo by Chen Weisong/China.org.cn]
焊接过程中产生的电弧温度达到4200℃以上，常人无法直视。
The arc temperature produced in welding is above 4,200 degrees Celsius, and people cannot look straight at it with the naked eye. [Photo by Chen Weisong/China.org.cn]
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