搅拌头结构对搅拌摩擦焊缺陷形成机制的影响

杨智勇; 李武鹏; 张宇; 李志强; 李卫京

doi:10.16511/j.cnki.qhdxxb.2021.22.039

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清华大学学报（自然科学版） ›› 2022, Vol. 62 ›› Issue (2) : 374-384. DOI: 10.16511/j.cnki.qhdxxb.2021.22.039

机械工程

搅拌头结构对搅拌摩擦焊缺陷形成机制的影响

杨智勇, 李武鹏, 张宇, 李志强, 李卫京

作者信息 +

Influence of stirring head structure on the defect formation mechanism in friction stir welding

YANG Zhiyong, LI Wupeng, ZHANG Yu, LI Zhiqiang, LI Weijing

Author information +

文章历史 +

摘要

采用不同结构的搅拌头和工艺参数，焊接热输入和材料流动行为不同，焊缝缺陷的类型也不同。基于Deform软件建立了A7N01材料搅拌摩擦焊仿真模型，通过焊接试验的测温曲线和缺陷完成了模型准确性评价。对比分析了3种搅拌头对焊接缺陷形成的影响。搅拌头结构不同，不同深度处的材料粒子点的切向填充速度不同。圆台搅拌头焊接多出现隧道缺陷、犁沟缺陷，平面搅拌头焊接多出现半隧道半犁沟缺陷。工艺参数与搅拌头的匹配度不同，在焊缝前进侧会出现不同类型的缺陷，并针对该问题提出了预防缺陷的二维工艺参数窗口。与圆台搅拌头相比，平面搅拌头焊接时可用的焊接工艺参数更广。

Abstract

The friction stir welding stirring head structure and welding process parameters lead to different welding heat inputs and material flow behaviors that result in different types of weld defects. This study simulated friction stir welding of A7N01 material using the Deform software. The model was verified by comparing with measured temperatures and observed defects in welding tests. The model was then used to investigate the influence of three kinds of stirring heads on the weld defect formation. The material particle tangential filling speeds varied with depth for different stiring heads. The circular stirring head mostly created tunnel-type and furrow-type defects, while the plane stirring heads mostly caused half-tunnel-and-half-furrow-type defects. Different process parameters for the same stirring head resulted in different types of defects in the advancing side of the weld. A two-dimensional process parameter selection window was then developed to select conditions that would prevent typical welding defects for each stirring head. The process parameter range is wider for the plane stirring head than for the circular stirring head for friction stir welding.

导出引用

杨智勇, 李武鹏, 张宇, 李志强, 李卫京. 搅拌头结构对搅拌摩擦焊缺陷形成机制的影响[J]. 清华大学学报（自然科学版）. 2022, 62(2): 374-384 https://doi.org/10.16511/j.cnki.qhdxxb.2021.22.039

YANG Zhiyong, LI Wupeng, ZHANG Yu, LI Zhiqiang, LI Weijing. Influence of stirring head structure on the defect formation mechanism in friction stir welding[J]. Journal of Tsinghua University(Science and Technology). 2022, 62(2): 374-384 https://doi.org/10.16511/j.cnki.qhdxxb.2021.22.039

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基金

中央高校基本科研业务费专项（重点项目）（2020JBZ113）

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收稿日期	出版日期
2021-06-16	2022-02-15
发布日期
2022-01-22

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