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郑韶先, 汪军平, 赵锡龙, 史伟. FSS/ASS厚壁异种钢“TIG冷焊 + UNGW”组合焊的接头组织与力学性能[J]. 焊接学报, 2022, 43(7): 28-35. DOI: 10.12073/j.hjxb.20210720001
引用本文: 郑韶先, 汪军平, 赵锡龙, 史伟. FSS/ASS厚壁异种钢“TIG冷焊 + UNGW”组合焊的接头组织与力学性能[J]. 焊接学报, 2022, 43(7): 28-35. DOI: 10.12073/j.hjxb.20210720001
ZHENG Shaoxian, WANG Junping, ZHAO Xilong, SHI Wei. Microstructure and mechanical property of the thick-walled dissimilar steel joint of FSS/ASS with the combined "TIG cold welding + UNGW"[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2022, 43(7): 28-35. DOI: 10.12073/j.hjxb.20210720001
Citation: ZHENG Shaoxian, WANG Junping, ZHAO Xilong, SHI Wei. Microstructure and mechanical property of the thick-walled dissimilar steel joint of FSS/ASS with the combined "TIG cold welding + UNGW"[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2022, 43(7): 28-35. DOI: 10.12073/j.hjxb.20210720001

FSS/ASS厚壁异种钢“TIG冷焊 + UNGW”组合焊的接头组织与力学性能

Microstructure and mechanical property of the thick-walled dissimilar steel joint of FSS/ASS with the combined "TIG cold welding + UNGW"

  • 摘要: 为了有效解决铁素体不锈钢的焊接热影响区晶粒易粗化问题,以及奥氏体不锈钢焊接时在接头部分熔合区及其附近热影响区内因易形成蠕虫状δ铁素体而显著降低该区域耐腐蚀性的问题,提出了“TIG冷焊 + UNGW”的组合焊接工艺,并进行了1Cr17/1Cr18Ni9Ti厚壁异种不锈钢的焊接,同时对所得接头的显微组织、力学性能及耐腐蚀性进行了测试与分析. 结果表明,组合焊接头的1Cr17母材热影响区晶粒未发生粗化,并且1Cr18Ni9Ti母材部分熔合区及其附近热影响区内未形成蠕虫状δ铁素体;组合焊接头的抗拉强度优于1Cr17母材,并且1Cr17母材热影响区的冲击吸收能量与1Cr17母材相当;组合焊接头的熔敷层、1Cr18Ni9Ti母材、1Cr17母材、UNGW焊缝区及完整接头的耐腐蚀性呈依次下降的趋势.

     

    Abstract: A combined welding technology of "TIG cold welding + UNGW" in this paper was proposed, in order to effectively solve the problem of welding heat affected zone(HAZ) grain coarsening in ferritic stainless steel, and the problem of forming vermicular δ ferrite in the part of fusion zone of the welded joint and near welding HAZ for welding of austenitic stainless steel, which significantly reduces corrosion resistance in this areas. Welding between 1Cr17/1Cr18Ni9Ti thick wall dissimilar stainless steels was conducted, meanwhile the microstructure, mechanical properties and corrosion resistance of the welded joint were tested and analyzed. The result shows that the HAZ grains of 1Cr17 base metal of combined welded joint are not coarsened, moreover, there is no vermicular δ ferrite in the part of fusion zone and near heat affected zone of 1Cr18Ni9Ti base metal. The tensile strength of combined welded joint is better than that of 1Cr17 base metal, and the impact absorption energy of HAZ of 1Cr17 base metal is equivalent to that of the 1Cr17 base metal. It shows a downward trend of corrosion resistance from the cladding layer of combined welded joint, the 1Cr18Ni9Ti base metal, 1Cr17 base metal, UNGW weld zone to the welded joint.

     

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