فهرست مطالب حسن کاوسی بلوتکی

In recent years, following the attention of the automobile industry to reduce the weight of cars, the use of alternative materials with lower weight and better mechanical properties has been the focus of these companies. In particular, hot-stamped boron steel has been considered as an alternative material due to its good mechanical properties. This material is used to reduce the weight of the frame due to its reduced thickness, excellent performance and good performance. Considering that hot stamping of boron steel causes oxidation and carbon deposition on the surface, the use of surface coating is necessary to prevent these cases. This coating layer itself causes side problems such as the narrowing of the weldable range and also the reduction of mechanical properties during resistance welding. Therefore, in this study, we introduce research performed to improve the weldability of Al-Si coated hotstamped boron steel in terms of the material and process.

Currently, aluminum is widely used in various industries due to its low density and good corrosion resistance. In this research, the simulation of the effect of friction stir welding process on the mechanical strength of aluminum sheet with aluminum multilayer background and carbon fiber or glass composite with aluminum background is discussed. First, the aluminum sheet in specific dimensions with Ensys finite element software for dam simulation. Then, friction stir welding was performed on aluminum alloy using one of the research parameters such as speed or penetration depth of the tool. According to the results of the research, when the pin starts moving, the amount of stress applied to the plate decreases. Therefore, reducing the speed of the linear movement of the pin and increasing its rotational speed makes the friction stir welding process go through a better process, and when the pin moves, the displacement of the plate particles decreases. By examining the particles, it was seen that the movement of the pin along the plate creates a turbulent area in the plate. It has been observed that with the application of stress by the pin, the particles in the HAZ area are also displaced and enter from the upper surface of the welding area and exit from the lower surface according to the direction of movement. It was observed that the aluminum composite participates favorably in the friction stir welding process and the part is not damaged in this process.