LNG储罐9%Ni钢立缝全自动焊技术

Automatic welding technology of 9%Ni steel vertical weld in LNG tank

对比分析了目前大型LNG储罐内罐9%Ni钢立缝对接焊的几种方法,介绍了DPS-3G全自动焊中TIP-TIG和钟摆焊接技术的优异性,研究认为采用DPS-3G全自动交流氩弧焊接技术,能彻底解决9%Ni钢窄坡口焊的侧壁未熔合的行业难题,同时-196℃低温冲击韧性优异,焊接接头性能质量可靠,无损检测一次合格率高,实现了高效率焊接,大幅缩短施工周期,节约施工成本。

This paper compares and analyzes several methods of butt welding of 9%Ni steel vertical weld in large LNG tank,and introduces the advantages of TIP-TIG and pendulum welding technology in DPS-3G automatic welding system.It is considered that DPS-3G automatic AC gas tungsten arc welding technology can completely solve the industry problem of side wall incomplete fusion of 9%Ni steel narrow groove welding.At the same time,the low temperature impact toughness of-196℃is excellent,the performance and quality of welding joint are reliable,the first pass rate of non-dest-ructive testing is high,high efficiency welding is realized,the construction period is greatly shortened,and the construction cost is saved.