6061-T4铝合金搅拌摩擦焊T型接头缺陷及性能

对板厚3ram的6061-T4铝合金T型接头进行搅拌摩擦焊接研究并具体讨论了旋转速率（ω）及焊接速率（v）对焊接缺陷及力学性能的影响。结果表明：对给定的夹具形式和搅拌工具，当”不变时焊缝前进侧筋板圆角过渡处容易产生随ω／v增大而减小的隧道缺陷，后退侧圆角区易出现清晰的“Z”连接线；壁板出现两个随ω增大而扩大的软化区域，而壁板焊缝中心的硬度随ω增大而升高；T型接头筋板焊缝热力影响区同样被软化，其硬度较母材降低17．0％；局部组织软件是造成所有接头沿壁板方向加载抗拉强度下降的重要原因，其最高抗拉强度只达到母材的73．8％，隧道缺陷是引起ω=1008r／min筋板方向强度降低的主要原因，而ω=154...

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Bibliographic Details
Published in航空材料学报 Vol. 32; no. 4; pp. 26 - 31
Main Author 周光 杨新岐 徐效东 张照华
Format Journal Article
LanguageChinese
Published 天津大学材料科学与工程学院天津市现代连接技术重点实验室,天津,300072 2012
Subjects
T型接头
力学性能
搅拌摩擦焊
焊接缺陷
焊接缺陷
力学性能
搅拌摩擦焊
T型接头
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ISSN1005-5053
DOI10.3969/j.issn.1005-5053.2012.4.005

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Summary:对板厚3ram的6061-T4铝合金T型接头进行搅拌摩擦焊接研究并具体讨论了旋转速率（ω）及焊接速率（v）对焊接缺陷及力学性能的影响。结果表明：对给定的夹具形式和搅拌工具，当”不变时焊缝前进侧筋板圆角过渡处容易产生随ω／v增大而减小的隧道缺陷，后退侧圆角区易出现清晰的“Z”连接线；壁板出现两个随ω增大而扩大的软化区域，而壁板焊缝中心的硬度随ω增大而升高；T型接头筋板焊缝热力影响区同样被软化，其硬度较母材降低17．0％；局部组织软件是造成所有接头沿壁板方向加载抗拉强度下降的重要原因，其最高抗拉强度只达到母材的73．8％，隧道缺陷是引起ω=1008r／min筋板方向强度降低的主要原因，而ω=1541r／min和ω=2256r／min筋板方向强度降低主要归结于T型接头中热力影响区组织的软化，其中当ω／v=1541／218r／ram时，沿T接筋板方向抗拉强度最高可达到母材的83．5％。
Bibliography:11-3159/V
friction stir welding ; T-welded joints ; welding defects ; mechanical properties
ZHOU Guang, YANG Xin-qi, XU Xiao-dong, ZHANG Zhao-hua （Tianjin Key Laboratory of Advanced Joining Technology, School of Materials Science and Engineering, Tianjin University, Tianjin 300072, China）
The processes of friction-stir-welded T-joints for 3mm thick AA 6061-T4 were investigated, and the influences of welding speeds and rotating speeds on welding defects and mechanical properties were discussed specifically. It was found that for given fixture and tool, when v was kept constant, tunnel defects were easily produced at the fillet corner of stringer nugget along advancing side which became smaller with the increasing to/v. Clear ＂Z＂ line was tended to appear near the retreating side. Two soften zones that were enlarged with the increasing to were found in the skin. The hardness in the center of weld was increased with the to increased. The stringer thermo-mechanically affected zone was also softened and its hardness
ISSN:1005-5053
DOI:10.3969/j.issn.1005-5053.2012.4.005