This paper investigates the material properties and free vibration characteristics of Stainless Steel (SS) 304 joints reinforced with Al₂O₃ microparticles fabricated by tungsten inert gas (TIG) welding and laser welding (LW) processes. The influence of Al₂O₃ microparticle addition on the metallurgical behavior, mechanical properties, and free vibrational characteristics were studied and discussed. Furthermore, in this work a novel attempt has been made to compare the material properties and free vibration characteristics of the joints. Microscopic analysis was conducted to understand the grain structure variations in different zones of a weldment. Finally, tensile and microhardness tests were performed to understand the mechanical properties. To study the natural frequency and damping factors in the joints, the samples were tested using the accelerometer, data acquisition card, and DEWE software. The experimental results revealed that the joints fabricated by the laser welding process proved a significant improvement in material properties and vibrational behavior, due to the homogenous distribution of microparticles across the fusion zone (FZ) and refined grain structures in (FZ) compared to that of joints made by tungsten inert gas welding. However, from the achieved results both material property and vibration analysis showed a good agreement.

本文研究了通过钨极惰性气体保护 (TIG) 焊接和激光焊接 (LW) 工艺制造的Al ₂ O ₃微粒增强不锈钢 (SS) 304 接头的材料特性和自由振动特性。Al ₂ O ₃的影响研究和讨论了微粒添加对冶金行为、机械性能和自由振动特性的影响。此外，在这项工作中，进行了一项新颖的尝试来比较接头的材料特性和自由振动特性。进行微观分析以了解焊件不同区域的晶粒结构变化。最后，进行拉伸和显微硬度测试以了解机械性能。为了研究接头的固有频率和阻尼系数，使用加速度计、数据采集卡和 DEWE 软件对样品进行了测试。实验结果表明，激光焊接工艺制造的接头在材料性能和振动行为方面得到了显着改善，由于与钨惰性气体焊接制成的接头相比，微粒在熔合区 (FZ) 上的均匀分布和 (FZ) 中的细化晶粒结构。然而，从所取得的结果来看，材料特性和振动分析都显示出良好的一致性。