下扎深度对回填式搅拌摩擦点焊接头断裂行为的影响

岳玉梅 1; 李政玮 1; 马轶男 1; 柴鹏 2; 邢敬伟 1

doi:10.7652/xjtuxb201508020

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下扎深度对回填式搅拌摩擦点焊接头断裂行为的影响

更新时间：2025-07-09

- 下扎深度对回填式搅拌摩擦点焊接头断裂行为的影响
- Effects of Plunge Depth on Fracture Behaviors of Refill Friction Stir Spot Welding
- 西安交通大学学报 2015年49卷第8期页码：122-127
- 作者机构：
  
  沈阳航空航天大学航空航天工程学部,沈阳,110136
- 作者简介：
- 基金信息：
  
  : 2015-02-06。作者简介: 岳玉梅(1971—),女,副教授。基金项目: 国家自然科学基金资助项目(51204111);辽宁省自然科学基金资助项目(2013024004)
- DOI：10.7652/xjtuxb201508020
  中图分类号： TG453
- 网络首发：2015-08-10，
  
  纸质出版：2015
- 稿件说明：
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岳玉梅 1, 李政玮 1, 马轶男 1, 等. 下扎深度对回填式搅拌摩擦点焊接头断裂行为的影响[J]. 西安交通大学学报, 2015,49(8):122-127.

Effects of Plunge Depth on Fracture Behaviors of Refill Friction Stir Spot Welding[J]. 2015, 49(8): 122-127.
岳玉梅 1, 李政玮 1, 马轶男 1, 等. 下扎深度对回填式搅拌摩擦点焊接头断裂行为的影响[J]. 西安交通大学学报, 2015,49(8):122-127. DOI： 10.7652/xjtuxb201508020.

Effects of Plunge Depth on Fracture Behaviors of Refill Friction Stir Spot Welding[J]. 2015, 49(8): 122-127. DOI： 10.7652/xjtuxb201508020.

摘要

为研究焊接工艺参数对回填式搅拌摩擦点焊(RFSSW)接头断裂行为的影响

以铝合金为例

通过改变焊接过程中套筒的下扎深度对上下板厚度不同的LY12铝合金进行RFSSW试验

从材料流动、原子扩散及接头软化等方面对其接头的断裂机理进行分析

并利用焊点的宏观形貌、显微组织和硬度进行验证。试验及分析结果表明:在RFSSW过程中

当套筒未扎透上板、hook缺陷较平且韧带在整个焊点厚度基本相同时

裂纹主要沿连接强度较弱的搭接面扩展

形成剪切断裂模式; 当套筒下扎至下板厚度的15%、hook缺陷向上弯曲且套筒回抽路径产生裂纹缺陷时

裂纹更倾向于沿着原子扩散时间较短的套筒回抽路径扩展

形成剪切塞型断裂模式; 随着套筒进一步下扎至下板厚的35%且hook缺陷向下弯曲

裂纹更容易沿着下板中的套筒回抽路径向下扩展; 当裂纹扩展到下板的下表面时

形成塞型断裂模式

断口形貌与断裂机理的分析结果相吻合。

Abstract

Effects of welding parameters on fracture behaviors of refill friction stir spot welding(RFSSW)welds are investigated. RFSSW is used to weld LY12 aluminum alloys with different thicknesses by changing the sleeve plunge depth. The fracture mechanisms of the welds are investigated from the aspects of material flow

atomic diffusion and softening

and are verified by the cross section

microstructure and hardness of the weld. Results show that the crack propagates along the interface of lap weld with lower joining strength and forms a shear fracture mode when the plunge depth is smaller than the thickness of upper plate

the hook defect is flat and thicknesses of bonding ligament in the weld are almost the same

and the crack is more easily to propagate along the withdrawing path with shorter atom diffusion time and results in the shear-plug fracture. When the sleeve penetrates into the lower plate thickness of 15%

the hook defect bends upwards and the crack defect appears at the sleeve withdrawing path. When the sleeve further plunges into the lower plate thickness of 35% and the hook defects present along a downward bending direction

the crack grows downwards along the withdrawing path of sleeve. When the crack reaches the bottom of lower plate

the plug fracture of RFSSW weld completed. These results show that the fracture morphologies are in agreement with analytical results of the fracture features.

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Keywords

references

YUAN W, MISHRA R S, CARLSON B, et al. Material flow and microstructural evolution during friction stir spot welding of AZ31 magnesium alloy [J]. Materials Science and Engineering: A, 2012, 543: 200-209.[2] HAN B, HUANG Y X, LÜ S X, et al. AA7075 bit for repairing AA2219 keyhole by filling friction stir welding [J]. Materials and Design, 2013, 51: 25-33.

ZHAO Y Q, LIU H J, LIN Z, et al. Microstructures and mechanical properties of friction spot welded Alclad 7B04-T74 aluminum alloy [J]. Science and Technology of Welding and Joining, 2014, 19(7): 617-622.

申志康, 杨新岐, 张照华, 等. 铝合金回填式搅拌摩擦点焊组织及力学性能分析 [J]. 焊接学报, 2013, 34(6): 73-76.

SHEN Zhikang, YANG Xingqi, ZHANG Zhaohua, et al. Analysis of microstructure and mechanical properties of refill friction stir spot welded aluminum alloy [J]. Transactions of the China Welding Institution, 2013, 34(6): 73-76.

SUHUDDIN U F H, FISCHER V, DOS SANTOS J F. The thermal cycle during the dissimilar friction spot welding of aluminum and magnesium alloy [J]. Scripta Materialia, 2013, 68(1): 87-90.

乔汝旺, 蒋舒斐, 苗玉刚, 等. AZ31镁合金/5A06铝合金填充式摩擦点焊工艺特性 [J]. 电焊机, 2014, 44(4): 14-17.

QIAO Ruwang, JIANG Shufei, MIAO Yugang, et al. Processing property of magnesium/aluminum dissimilar metals for refill friction spot welding [J]. Electric Welding Machine, 2014, 44(4): 14-17.

ZHAO Y Q, LIU H J, CHEN S X, et al. Effects of sleeve plunge depth on microstructures and mechanical properties of friction spot welded alclad 7B04-T74 aluminum alloy [J]. Materials and Design, 2014, 62: 40-46.

TIER M D, ROSENDO T S, DOS SANTOS J F, et al. The influence of refill FSSW parameters on the microstructure and shear strength of 5042 aluminum welds [J]. Journal of Materials Processing Technology, 2013, 213(6): 995-1005.

SHEN Z K, YANG X Q, ZHANG Z H, et al. Microstructure and failure mechanisms of refill friction stir spot welded 7075-T6 aluminum alloy joints [J]. Materials and Design, 2013, 44: 476-486.

JI S D, MENG X C, LIU J G, et al. Formation and mechanical properties of stationary shoulder friction stir welded 6005A-T6 aluminum alloy [J]. Materials and Design, 2014, 62: 113-117.

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