低温天然气管道焊接气孔的误判纠正和工艺改进

以哈萨克斯坦让那若尔油田-KC13天然气管道工程为例，阐述了中方专家对俄罗斯监理误判的6道“焊接裂纹”（实际为焊接气孔）进行的认真分析。首先，从底片成像的分析上，对裂纹的判定提出了疑问；进而，从工艺分析上，排除了冷裂纹和热裂纹的可能性；最终，综合判定该缺陷为链状条虫形气孔。同时，说明了为减少低温环境下的焊接缺陷而采取的相应措施，为中国施工单位在中亚地区进行类似的焊接工程提供了借鉴。

Correction of Misjudgment of Welding Stomas of Gas Pipeline at the Low Temperature and the Improvement Technique

By taking Zhananol Oil Field to KC13 gas pipeline project as an example,this paper expounded the Chinese experts' analysis of the misjudgment of six"cracks"(which are stomas)decided by a Russian Supervisor at a low temperature.First,based on the film analysis,we raised questions on the judgment of the crack;second,based on the techniqical analysis,we excluded the possibility of cold cracks and hot cracks;finally,we draw a conclusion that the defects were chained cestode stomas.Simultaneously,the paper pointed out a corresponding measure,It provided references for the other Chinese construction companies when they undertook similar welding engineering projects in such an area.