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采用超细颗粒焊剂约束电弧超窄间隙焊接方法进行了1Cr18Ni9Ti奥氏体不锈钢的超窄间隙焊接试验,并对所得超窄间隙焊接接头的组织及性能进行了测试和分析。结果表明,1Cr18Ni9Ti奥氏体不锈钢超窄间隙焊接接头的根焊焊缝区晶粒为等轴晶,而填充焊和盖面焊的焊缝区晶粒则为粗大的柱状晶。等轴晶和柱状晶的基体均为奥氏体,晶粒内部均分布有少量板条状铁素体。超窄间隙焊接接头的填充焊缝和根焊焊缝具有与母材相当的硬度,而盖面焊缝的硬度则略低于母材。超窄间隙焊接接头除了收缩率和冲击功比母材的略低外,抗拉强度、屈服强度及伸长率明显高于母材所对应性能的最低值。此外,试验还测得超窄间隙焊接接头的腐蚀速率为0.417 g/(m2·h),该值明显低于母材的腐蚀速率。
Ultra-narrow gap welding of 1Cr18Ni9Ti austenitic stainless steel was carried out by ultra-fine particle flux confined arc ultra-narrow gap welding method. The microstructure and properties of the ultra-narrow gap welded joint were tested and analyzed. The results show that the grains in root welding zone of 1Cr18Ni9Ti austenitic stainless steel ultra-narrow gap welding joint are equiaxed grains, whereas the grains in the weld zone of filling welding and capping welding are coarse columnar grains. Equiaxed and columnar crystal matrix are austenitic, grain are distributed within a small amount of lath ferrite. Filler welds and root welds of ultra-narrow gap weld joints have a hardness comparable to that of the base metal, while the hardness of the cap weld is slightly lower than that of the base metal. Ultra-narrow gap welded joints in addition to the shrinkage and impact energy than the base metal slightly lower, the tensile strength, yield strength and elongation were significantly higher than the corresponding minimum performance of the base metal. In addition, the test also found that the corrosion rate of the ultra-narrow gap welded joint is 0.417 g / (m2 · h), which is obviously lower than the corrosion rate of the base metal.