研究了钽与不锈钢电子束焊接接头组织、缺陷特征及力学性能.电子束热源作用位置影响到接头成形,偏不锈钢0.2 mm进行焊接接头成形较好.焊缝为细小枝晶组织,Fe元素含量较高,形成的ε相(Fe2Ta)和μ相(FeTa或Fe7Ta6)为弥散分布.在钽侧熔合线处ε相和μ相为层状分布,在焊接应力作用下易形成微裂纹缺陷.接头焊缝区普遍硬度较高,而钽侧熔合线处变形协调能力较差,存在裂纹源,导致接头拉伸时在该处断裂.接头抗拉强度不高,仅为255MPa.
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