环境温度对A6N01铝合金焊接接头力学性能及微观组织的影响 Effect of Temperature on Mechanical Properties and Microstructure of Welded Joints of A6N01 Aluminum Alloys

在−20℃、−10℃、0℃、20℃的温度条件下对A6N01铝合金焊接接头进行焊接，测试不同环境温度条件下焊接接头的拉伸强度，冲击韧性，硬度以及显微组织。研究结果表明，温度对A6N01铝合金对接接头的抗拉强度的数值影响不大，但是接头断裂的位置发生了变化，这可能需要引起重视。温度对A6N01铝合金对接接头的冲击韧性的数值影响较大。在常温情况下的焊缝中可以观察到较多的析出相，而随着温度下降，析出相逐渐减少，气孔和夹渣也较少。 The welded joints of A6N01 are fabricated at the temperature of -20˚C, -10˚C, 0˚C and 20˚C and the tensile strength, impact toughness, microhardness and microstructure were studied. The results showed that the temperature didn’t change the tensile strength but affected the fracture location. The temperature affects the impact toughness in large amount. A lot of precipitate phases precipitated from the weld zone in the normal temperature but the much less precipitate phases with the decrease of the temperature, and the porosity and slag decreased too.