Dissimilar Friction Stir Lap Welding of Al to Mg: Characteristic Signal, Microstructure and Mechanical Properties

The spindle characteristic signal (forces and vibrations) at different friction stir lap welding (FSLW) parameters were studied. The result indicated that the spindle force and vibration have different trends with the change of welding parameters. For further study, the spindle dynamic performance evaluation model by means of the Technique for Order Preference by Similarity to the Ideal Solution (TOPSIS method) was established. The model was used to calculate the relative approach degree B under different welding process parameters. The correlation between the characteristic signal and the joint properties was obtained. The model was validated by mechanical performance testing and microscopic observation. The results showed that the model evaluations were consistent with the experimental results.

Automated summary

The study focused on analyzing spindle characteristic signals under different FSLW parameters, establishing a dynamic performance evaluation model, calculating the relative approach degree B, and finding the correlation between characteristic signals and joint properties. The model was validated through mechanical performance testing and microscopic observation, showing consistent results with experimental data.