摘要
利用双熔敷极焊条电弧焊技术对X80管线钢进行了焊接,并在焊接接头成分、组织及耐蚀性方面与传统焊条电弧焊进行了对比分析.结果表明,双熔敷极焊条电弧焊技术熔敷效率高,但受其结构及药皮重量系数的影响焊缝中合金元素的含量比普通焊接焊缝的低,且焊缝中多边形铁素体含量较高,另一方面由于对母材的热输入较低,使得其粗晶区组织较为细小,这有利于其性能的提高;对0.5MNa_2CO_3-1MNaHCO_3溶液及通饱和CO_2的NACEA溶液中的耐蚀性研究发现,焊缝及粗晶区耐蚀性均差于母材,且采用双熔敷极焊条电弧焊技术有利于提高焊缝及粗晶区的耐蚀性.
X80 pipeline steel was welded by twin electrode arc welding technology,and the composition,microstructure,corrosion resistance of welded joint were studied and compared with those of traditional arc welding. The deposition efficiency of twin electrode arc welding is higher than that of the traditional electrode arc welding,however,the concentration of alloying elements in welding material is lower because of the gravity coefficient of coating and its special structure. In addition,the concentration of polygonal ferrite is higher in welding material.What's more,the microstructure of CGHAZ is much finer because of the lower heat input for base material,which is beneficial to the promotion of the properties. The corrosion resistance of weld metal and CGHAZ is inferior to that of base metal in0. 5 M Na_2CO_3-1 M NaHCO_3 solution and NACE A solution with saturated CO_2. However,the twin electrode arc welding facilitates the corrosion resistance of weld metal and CGHAZ compared with the traditional arc welding.
出处
《焊接学报》
EI
CAS
CSCD
北大核心
2016年第10期51-54,132,共4页
Transactions of The China Welding Institution
基金
国家自然科学基金面上资助项目(51271099)
关键词
双熔敷极焊条电弧焊
管线钢
耐蚀性
twin electrode arc welding
X80 pipeline steel
corrosion resistance
