Plastic Joining Mechanism of Friction Stir Rivet Welding Process for Aluminum Alloy Sheets with Non-Uniform Thickness

doi:10.7652/xjtuxb202102010

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Plastic Joining Mechanism of Friction Stir Rivet Welding Process for Aluminum Alloy Sheets with Non-Uniform Thickness

更新时间：2025-07-09

- Plastic Joining Mechanism of Friction Stir Rivet Welding Process for Aluminum Alloy Sheets with Non-Uniform Thickness
- Vol. 55, Issue 2, Pages: 84-92(2021)
- 作者机构：
  
  西安交通大学机械工程学院,西安,710049
- 作者简介：
- 基金信息：
- DOI：10.7652/xjtuxb202102010
  CLC： TG441.8
- Online First：10 February 2021，
  
  Published：2021
- 稿件说明：
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Plastic Joining Mechanism of Friction Stir Rivet Welding Process for Aluminum Alloy Sheets with Non-Uniform Thickness[J]. 2021, 55(2): 84-92.
DOI：

Plastic Joining Mechanism of Friction Stir Rivet Welding Process for Aluminum Alloy Sheets with Non-Uniform Thickness[J]. 2021, 55(2): 84-92. DOI： 10.7652/xjtuxb202102010.

摘要

为了克服传统铝合金点连接技术存在裂纹、气孔、成形力大和气密性差等不足

实现铝合金板材的高性能点连接

提出了搅拌摩擦铆焊塑性连接新工艺原理

通过理论分析和试验研究

针对不等厚铝合金板材论证了新工艺原理的可行性。首先研究了铝合金板材搅拌摩擦铆焊工艺过程中材料流动行为和温度场分布

重点讨论了转速和持续加热时间对温度变化的影响规律

然后通过控制铆焊热输入量进行了工艺参数优化

并开展了螺纹铆钉式搅拌摩擦铆焊试验研究

最后验证了连接样件横截面材料组织分区与温度场分布的一致性

确定了该工艺的塑性连接机理。结果表明:转速和持续加热时间是影响搅拌摩擦铆焊接头力学性能的关键因素; 3 mm和4 mm厚6061-T6铝合金板材搅拌摩擦铆焊的最优转速范围为1 000～1 400 r·min

-1

持续加热时间为3～15 s; 上下板材之间形成冶金结合

塑化材料与螺纹铆钉之间形成机械结合。因此

铝合金板材搅拌摩擦铆焊塑性连接机理符合预期

该新工艺原理有效可行。

Abstract

A novel processing principle of friction stir rivet welding(FSRW)is proposed to solve the defects such as cracks

pores

high forming force requirement and poor air tightness

which are usually observed in the traditional aluminum alloy sheets spot joining technology

and to realize high-performance spot joining for aluminum alloy sheets as a consequence. The feasibility is demonstrated for aluminum alloy sheets spot joining with non-uniform thickness by theoretical analysis and experimental research. The material flow behavior and temperature distribution in FSRW process of aluminum alloy sheets are investigated and the effects of rotational

speed and dwelling time on the temperature distribution are discussed emphatically. Then

FSRW experiments are carried out following process parameters optimization by controlling the welding heat input. The consistency between theoretical analysis and experimental research is verified and plastic joining mechanism of this novel process is defined by macro/micro analysis of transverse section of the obtained joint. The results indicate that rotational speed and dwelling time are significant factors affecting mechanical properties of the FSRW joints; the reasonable process parameter ranges of rotational speed(1 000-1 400 r·min

-1

)and dwelling time(3-15 s)are beneficial for aluminum alloy 6061-T6(AA6061-T6)sheets joining of 3 mm and 4 mm thickness. Metallurgical joining can be observed between upper and lower sheets while mechanical joining between plasticized material and threaded rivet. Therefore

the plastic joining mechanism of FSRW process for aluminum alloy sheets accords with the expectation

and this novel process is effective and feasible.

关键词

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references

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