Preparation, Inspection, and Optimization of Rotary Friction Welding Parameters for 2017aa Aluminum Alloy Specimens.

Abstract

Abstract The qualification of the FSW process in aerospace requires the production of high-quality joints with long tool lifespan. This necessitates fine-tuning process parameters such as tool geometry (shoulder and pin dimensions, threading) and feed and rotation speeds. The experimental part involves characterizing the FSW weld joint through the study of mechanical properties and microstructural changes. The analyses and control observations performed on the obtained weld beads have, on one hand, enabled the correlation of joint quality with operational parameters. To achieve this, a local fabrication procedure aimed at producing defect-free joints was devised. Microstructural analysis revealed that the tool's rotation speed influences recrystallization conditions; the higher the rotation speed, the greater the welding energy and the more pronounced the softening of the material in the Heat Affected Zone (HAZ).