气焊一般用来评估焊接材料的腐蚀速率，评估这些材料在腐蚀环境中的使用。

Autogenous welds are commonly used to evaluate corrosion rates of welded materials and the usage of these materials in corrosive environments.

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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。

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.

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他离开的时候忘记关掉气焊焊炬了。

He forgot to turn off the gas torch when he left.

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