Al-Li-Er合金的激光焊接工艺与组织性能研究

Research on Laser Welding Technology and Microstructure Properties of Al-Li-Er Alloy

采用激光填丝焊对Al-Li-Er铝合金进行焊接处理,研究激光功率、焊接速度和送丝速度对焊接接头显微组织与力学性能的影响。结果表明,当送丝速度为3 m/min和4 m/min时,Al-Li-Er合金焊接接头的焊缝面积都会随着激光功率和焊接速度的增大而逐渐减小;在相同激光功率和焊接速度时,送丝速度的增加会增大焊缝面积,且随着送丝速度的增加,激光焊接接头的上余高系数和下余高系数都呈现逐渐增加的趋势。Al-Li-Er合金适宜的激光焊接工艺参数为激光功率3 kW、焊接速度3 m/min、送丝速度2~3 m/min,此时焊接接头的室温拉伸性能与母材较为接近。

With Al-Li-Er aluminum alloy being welded with the laser filler wire,the influence of laser power,welding speed and wire feeding speed on the microstructure and mechanical properties of the welded joints are studied.The results show that the weld area of the joint will decrease with the increase of laser power and welding speed when the wire feeding speed is 3 m/min and 4 m/min;With the same laser power and welding speed,the weld area will increase with the increase of the wire feeding speed,and with the increase of the feeding speed,the upper and lower reinforcement coefficients of the joint shows a gradual increasing trend.It is found that the suitable laser welding parameters of Al-Li-Er alloy are laser power of 3 kW,welding speed of 3 m/min and wire feeding speed of 2~3 m/min,at which the tensile properties of welded joints at room temperature are close to that of the base metal.