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2B06/7B04 异种铝合金 RFSSW 温度场数值模型及孔洞缺陷形成机制研究
Study on the Refill Friction Stir Spot Welding Temperature Field NumericalModel and Porosity Formation Mechanism of 2B06/7B04Dissimilar Aluminium Alloy
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- DOI:
- 作者:
- 王 鑫 1，2，祖韵迪 1，2，张 达 1，2，熊江涛 1，2，李京龙 1，2，郭 伟 1，2
WANG Xin1,2, ZU Yundi1,2, ZHANG Da1,2, XIONG Jiangtao1,2, LI Jinglong1,2, GUO Wei1,2
- 作者单位:
- 1. 西北工业大学 凝固技术全国重点实验室，陕西 西安 710072；2. 西北工业大学 摩擦焊接技术陕西省重点实验室，陕西 西安 710072
1. State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an 710072, China; 2. ShaanxiKey Laboratory of Friction Welding Technologies, Northwestern Polytechnical University, Xi'an 710072, China
- 关键词:
- 高强铝合金；回填式搅拌摩擦点焊；温度场；数值模拟
high strength aluminium alloy; refill friction stir spot welding; temperature field; numerical simulation
- 摘要:
- 以航空高强铝合金 2B06(1 mm)/7B04(1.5 mm)回填式搅拌摩擦点焊(refill friction stir spot welding, RFSSW)为研究对象，采用 ABAQUS 有限元模拟，对焊接过程温度场和欧拉体积分数(Eulerian volume fraction, EVF)场进行了研究。 结果表明，RFSSW 温度场是关于焊点中轴线呈中心对称的圆形。 高温区位于 SZ 处，当转速超过 1 600 r/min 时，SZ的峰值温度超过材料固相线温度。 随着转速增加，根部孔洞率先降低后升高，这是由于低转速材料流动性差难以填满根部，高转速下焊具发生粘料造成的体积损失，使材料无法填满根部。The refill friction stir spot welding (RFSSW) process of aviation-grade high-strength aluminium alloys 2B06(1 mm) and 7B04 (1.5 mm) was investigated using the ABAQUS finite element method to analyse the temperature fieldand Eulerian volume fraction (EVF) field. The results indicate that the temperature distribution in the RFSSW isaxisymmetric and circular about the weld centerline. The stir zone (SZ) has the highest temperature, with the peak valueexceeding the solidus temperature of the material when the rotational speed surpasses 1 600 r/min. Moreover, the root voidfraction initially decreases but then increases with increasing rotational speed. This behavior is attributed to insufficientmaterial flow at low rotational speeds, which hinders complete root filling, and material adhesion to the tool at highrotational speeds, leading to volume loss and incomplete root consolidation.