Effects of welding physical fields on the microstructure evolution during dynamic-stationary shoulder friction stir welding

You, Jiaqing; Zhao, Yunqiang; Miao, Shu; Lin, Zhicheng; Yu, Fajun; Dong, Chunlin; Su, Yunhai

doi:10.1016/j.jmrt.2023.01.228

Cited by 6 publications

(4 citation statements)

References 25 publications

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“…It is evident that the IMCs present at the top of the first-pass weld of DS-FSW are significantly thicker than those in C-FSW. The thickness of IMCs is influenced by multiple factors, and can be mathematically expressed through the formula [25,26], where δ is the IMCs thickness, K0 is the pre-exponential factor, t is the processing time, Q is the effective activation energy, R is the universal gas constant, T is the temperature. As the tool rotation and moving speeds are the same for both welding processes, the influence of processing time is disregarded.…”

Section: Resultsmentioning

confidence: 99%

“…As the tool rotation and moving speeds are the same for both welding processes, the influence of processing time is disregarded. Moreover, it is found that an increase in strain rate leads to an increase in effective activation energy [25]. Based on the above analysis, there are two main reasons for this phenomenon.…”

Section: Resultsmentioning

confidence: 99%

“…The thickness of IMCs is influenced by multiple factors, and can be mathematically expressed through the formula 4 and Figure 5). [25,26],…”

Section: Interface Microstructurementioning

confidence: 99%

“…Based on the above analysis, there are two main reasons for this phenomenon. First, the C-FSW tool has a bigger size than the DS-FSW tool, resulting in a higher strain rate near the T-W interface leading to increasing the effective energy, which partially inhibits the formation of IMCs [25]. Second, according to reference [13], increasing the tool offset in FSW will lead to form a thicker IMCs layer.…”

Section: Interface Microstructurementioning

confidence: 99%

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Eliminating root defect in Al/Ti dissimilar friction stir welded via the double-side process

Zhang

Wang

et al. 2023

Science and Technology of Welding and Joining

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The root defect is easy to occur in the conventional friction stir welded (C-FSW) Ti/Al dissimilar joints because of the thermophysical properties of titanium alloy. Double-side friction stir welding (DS-FSW) may be a solution to eliminate root defects. This work performed microstructure analyses of the Al/Ti interface for both C-FSW and DS-FSW joints and comprehensively investigated the effects of root defects. The results show that the mechanical properties of the Al/Ti C-FSW joints are severely weakened by root defects. Tensile strength of the DS-FSW joints was 310.8 MPa, which is 73 MPa high than the C-FSW joints. The DS-FSW process can effectively remove the root defects which offers a novel approach to achieve high-quality joining of Al/Ti dissimilar structures.

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