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A356是一种高强度铝硅铸造态合金,广泛用于食品、化工、船舶、电器和汽车行业。熔焊这种铸造合金时存在许多问题,如孔隙、微裂隙、热裂等。然而,用搅拌摩擦焊(FSW)来焊接这种铸造态合金可以避免上述缺陷发生。研究了搅拌摩擦焊工艺参数对铸造态A356铝合金抗拉强度的影响;对旋转速度、焊接速度和轴向力等工艺参数进行优化;从宏观和微观组织分析角度对焊接区的质量进行分析;对焊接接头的抗拉强度进行了测定,并对抗拉强度与焊缝区硬度和显微组织的相关性进行了研究。在旋转速度1000r/min、焊接速度75mm/min和轴向力5kN的条件下得到的焊接接头具有最高的抗拉强度。
A356 is a high-strength aluminum silicon cast alloy, widely used in food, chemical, marine, electrical and automotive industries. There are many problems when welding such cast alloys, such as porosity, micro-cracks and thermal cracking. However, the use of friction stir welding (FSW) to weld the as-cast alloy can avoid the above defects. The effect of friction stir welding parameters on the tensile strength of casting A356 aluminum alloy was studied. The parameters of the rotating speed, welding speed and axial force were optimized. The quality of the welding zone was analyzed from macroscopic and microstructure analysis. The tensile strength of welded joint was measured, and the relationship between tensile strength and weld zone hardness and microstructure was studied. The welded joints obtained at a rotational speed of 1000 r / min, a welding speed of 75 mm / min and an axial force of 5 kN have the highest tensile strength.