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。
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。
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；
The increase of weld current can reduce the hardness and the content of upper bainite, and lower the sensibility of hydrogen cracking of the joints.
在避免烧穿的前提下增大焊接电流能够减小硬度、减少上贝氏体，从而降低氢致开裂敏感性。
It has been applied to simulation training systems of the hydrogen cracking, hydrogen-making, and platinum reforming etc., and the satisfied effects are obtained.
将该算法应用于加氢裂化、制氢、铂重整等工业过程的仿真培训系统，取得了满意的效果。
The nitrogen-protecting system of the material tank farm for hydrogen-cracking-unit in one of Nanjing branch of Sinopec was unsatisfied in the protecting effect and more nitrogen-consuming.
中石化南京某分公司加氢裂化原料罐区氮封系统多年来存在着氮耗量大、氮封效果差的问题。
The nitrogen-protecting system of the material tank farm for hydrogen-cracking-unit in one of Nanjing branch of Sinopec was unsatisfied in the protecting effect and more nitrogen-consuming.
中石化南京某分公司加氢裂化原料罐区氮封系统多年来存在着氮耗量大、氮封效果差的问题。
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