中卫-贵阳联络线工程山区返修焊接工艺

在山区,沿地表铺设的长输管道会产生不同程度的弯曲,弯曲的管道将给焊接返修带来一定困难。当返修点位于焊口拉应力位置时,切开焊缝金属极易在切口处产生新裂纹,可采用吊管机等起重设备减小管道弯曲程度从而减小返修处的拉应力。在中卫-贵阳联络线干线工程中,通过对X80管线钢焊缝返修工艺的分析,总结了在山区进行返修的焊接经验和技术方法,确定了改善焊缝受力状态、清除焊接缺陷以及施焊的具体措施,提高了焊缝返修的合格率。

Repair welding techonology of Zhongwei-Guiyang tie-line project area

In the mountains area,long distance pipelines laying under the surface may work different degrees of bending,the bending pipe pose a hardship to welding repair work.When you repair at the points of welding tensile stress position,cut the welding metal possibly produce new cracks at the incision,then you can use hanging pipe lifting equipment,which can reduce pipe bending so as to reduce pulling stress.In Zhongwei-Guiyang-tie-line link project,by the analysis of X80 technology of pipeline steel weld repair,the author have sum up the repair method of welding experience and technology in mountain areas,determine to the improve of weld stress,purge welding defects,do the welding of measures,improve the success rate of weld repair.