A Mahdian - Faculty of Engineering, University of Kashan, Kashan, Iran
M Abbasi - Faculty of Engineering, University of Kashan, Kashan, Iran
M Givi - Faculty of Engineering, University of Kashan, Kashan, Iran

In the present study, the microstructure and the mechanical properties of lap joint developed between low carbon steels using friction stir brazing (FSB) method while SiO2 nanoparticles were incorporated in joint were investigated. Sn- Pb braze alloy was used as braze alloy. The bonds werecharacterized by optical microscopy (OM) and shear and micro hardness tests were carried out as mechanical experiments. The results showed that a strong joint could be developed between parent metals due to diffusion of Sn and Pb elements. Additionally, the joint was strengthened asSiO2 second phase particles were incorporated in the joint. SiO2 nano-particles act as second phase particles and correspondingly, decrease the movement of dislocations and increase the strength

Friction stir brazing- Low carbon steel- Mechanical properties