Optimization of Friction Stir Welding Process Equipment Based on TRIZ Theory

Abstract

［Objective］ Friction stir welding is a key welding technology for next-generation. To address welding quality defects associated with friction stir welding, it is necessary to conduct an in-depth study of its welding process and explore its equipment optimization strategies. ［Method］ The working mechanism of friction stir welding is analyzed, identifying four common types of its quality defects. Based on TRIZ theory, potential quality defects in the welding process are examined, leading to the identification of three pairs of technical contradictions. By querying the contradiction matrix in TRIZ theory, inventive principles are derived to optimize existing welding processes and equipment. Based on this, improvement of the stir pin shoulder structure, optimization of the stir pin design, and enhancement of the metal insulation ring cover three optimization strategies are proposed. These optimization strategies are evaluated using the Analytic Hierarchy Process (AHP) to determine the best solution. ［Result & Conclusion］ Improvement of the stir pin shoulder structure is the optimal solution， it effectively addresses the welding quality defects of friction stir welding, improves welding quality, and enhances processing efficiency.

Keywords

• rail transit vehicle
• carbody welding
• friction stir welding
• optimization of process equipment
• triz theory
• analytic hierarchy process