Because of the fast cooling of flowing medium, the hydrogen cracking occurs easily under in-service welding.

在役焊接过程中，管内流动介质的快速冷却，易使接头出现氢致裂纹。

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Disadvantages include risk of hydrogen cracking in carbon steels and weld metal porosity in aluminium alloys.

缺点是在碳钢中有氢致裂纹、铝合金中有焊缝气孔产生的危险。

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For the natural gas transmission pipeline, the special steel pipe that can resist hydrogen cracking should be developed.

对于天然气输送管道，需研制抗氢致裂纹的专用管线钢管；

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Chemical companies today create hydrogen by cracking methane, a process that results in a tremendous amount of greenhouse gases.

FORBES: Why Hydrogen Cars Could Still Be The Future

Ah, but buy enough time, in the White House scenario, and we will have developed alternative fuels, "cold cracking" refineries and hydrogen cars.

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By cracking down on carbon and embracing hydrogen, he could even lead.

ECONOMIST: The environment