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油气输送管道由于腐蚀或机械损伤引起的减薄区以及由于管道的大段破坏或工艺要求需要安装分输支管，通常要进行现场焊接操作。该操作如果在不停输的情况下进行，会大大减少由此引起的经济损失。但是在不停输情况下焊接，由于管内介质的流动而产生的快冷效果可能会形成热影响区（ＨＡＺ）的氢致开裂。为了避免氢致开裂获得优良的焊接接头，本文在低碳钢管的循环试验管道上初步研究了焊接残余应力、焊接区冷却速度、焊接工艺条件等因素对运行管道在线焊接时产生氢致开裂的影响。试验得出了一些有益的结果，为进一步深入研究奠定了基础。
Oil and gas pipelines due to corrosion or mechanical damage caused by the thinning area and due to the destruction of large sections of pipe or process requirements need to install sub-branch pipe, usually on-site welding operations. This operation, if carried out without interruption, will greatly reduce the resulting economic losses. However, without stopping the welding process, the rapid cooling effect due to the flow of the medium in the tube may cause hydrogen induced cracking in the heat affected zone (HAZ). In order to avoid hydrogen cracking caused by excellent welded joints, this paper preliminary study on the cyclic test tube of low carbon steel pipe welding residual stress, the cooling rate of the welding zone, welding conditions and other factors on the operation of pipe welding online hydrogen cracking caused . Some useful results have been obtained from the experiment, which laid the foundation for further research.