Abstract
Friction stir lap welding (FSLW) is expected to join the hybrid structure of aluminum alloy and steel. In this study, the Al-Mg-Si aluminum alloy and 301L stainless steel were diffusion bonded by FSLDW with the addition of 0.1 mm thick pure Zn interlayer, when the tool pin did not penetrate the upper aluminum sheet. The characteristics of lap interface and mechanical properties of the joint were analyzed. Under the addition of Zn interlayer, the diffusion layer structure at lap interface changed from continuous to uneven and segmented. The components of the diffusion layer were more complex, including Fe-Al intermetallic compounds (IMCs), Fe-Zn IMCs and Al-Zn eutectic. The largely changed composition and thickness of uneven and segmented diffusion layer at the lap interface played a significant role in the joint strength. The tensile shear load of Zn-added joint was 6.26 kN, increasing by 41.3% than that of Zn-not-added joint. These two joints exhibited interfacial shear fracture, while the Zn interlayer enhanced the strength of diffusion bonding by extending the propagation path of cracks.
Highlights
Academic Editors: Long Wan and Steels and 6xxx series aluminum alloys play a vital role in the modern transportation manufacturing [1,2]
The maalloy of the joint is divided into different zones including stir zone (SZ), thermoterial experiences the uneven thermal mechanical cycle, and the aluminum alloy mechanically affected into zonedifferent (TMAZ),zones and heat affected
The lap interface is of the joint is divided including stirzone zone(HAZ)
Summary
Academic Editors: Long Wan and Steels and 6xxx series aluminum alloys play a vital role in the modern transportation manufacturing [1,2]. The lap structure of dissimilar metals can be joined by transient liquid phase bonding, fusion welding, brazing and solid-state welding [5,6,7,8]. The transient liquid phase bonding requires long time to obtain a good joining. Brazing has the advantages of a smaller joint deformation and less IMCs generation than fusion welding, defects such as slags and porosities are produced because of the filler material. In order to improve the reliability of the welded joint, solid-state welding is preferred for Al/steel dissimilar metals [9]
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