摩擦攪拌點銲(FSSW)為摩擦攪拌銲接(FSW)的衍生，其為一固態接合技術，由於過程中溫度未達熔點，故無氣孔、凝固裂紋等傳統熔融銲接所產生之缺陷，所以特別適合鎂、鋁合金等輕金屬點銲的應用。
本研究是以CNC銑床對AZ61鎂合金板材進行摩擦攪拌點銲搭接，實驗過程中量測銲接力量變化及溫度分佈，進而計算出不同銲接參數之入熱量的變化，並從入熱量對銲件機械性質、顯微組織等的影響來探討AZ61鎂合金之摩擦攪拌點銲銲接性，並找出最佳之銲接參數。
實驗結果顯示，軸向力的變化呈現二個波峰，扭力為一個波峰，最大軸向力與扭力受到銷部壓入速率的影響較大。在微觀組織方面，攪拌區有晶粒細化的現象發生，入熱量愈高晶粒愈大;在機械性質方面，軋延方向橫截面之硬度分佈以靠近攪拌區外側最高，之後在往兩旁遞減，硬度隨著入熱量的增加而下降;拉剪破壞荷重(TSFL)隨著入熱量的增加而增加，入熱量愈大銲件接合品質愈佳，最大拉剪強度為55 MPa，約為母材的42％; 拉剪破壞起始於銲件上下板接合界面的交界處。AZ61鎂合金摩擦攪拌點銲之銲接性優於熔融銲接，本實驗中最佳製程參數應為總製程時間較短，仍可獲得甚佳拉剪強度之 2500rpm-2mm/sec-4sec參數組合。

Friction stir spot welding (FSSW) is a derivative process of the friction stir welding (FSW), which is a solid-state joining technique, due to the process temperature below the melting point, so it therefore does not exit porosity, solidification cracking and other defects generated by traditional fusion welding. It is especially suitable for magnesium, aluminum and other light metal alloys.
In this study, AZ61 magnesium alloy plats were lap-jointed by friction stir spot welding. During the experimental process, measurement of the welding force change and the temperature distribution were made the welding heat inputs of each experimental condition were calculated to investigate the effect on the mechanical properties, microstructure, in order to discuss the weldability and find the best welding parameter of AZ61magnesium alloy friction stir spot welding.
The experimental results show that the curves of axial force change have two peaks, and the curves of torque change have one peak. The maximum axial force and torque are mainly affected by the probe plunged rate. In the microstructure, a phenomenon of grain refinement was observed in the stir zone of the weld, but raising the total heat input increases the grain size of the stir zone. The hardness distribution is the highest around the keyhole and decreases away from the center line. The highest hardness decreases with increases in total heat input. Tensile shear failure load (TSFL) increases with raising the total heat input. The weldment with greater heat input has better bonding quality. The best TSFL in this study is about 55 MPa, 42％ compared with the base material. The tensile shear damage starts at the junction of upper and lower plates interface in the weldment. The weldability of FSSW is better than that of the traditional melting welding. The best welding parameters in this experiment of AZ61 magnesium alloy friction stir spot welding is 2500rpm-2mm/s-4s, because of it has shorter total process time and second best tensile shear strength to obtain.

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