In order to overcome the problems of many pores,large deformation and unstable weld quality of traditional laser welded aluminumcopper alloy joints,a red-blue dual-beam laser source and a swinging laser were introduce...In order to overcome the problems of many pores,large deformation and unstable weld quality of traditional laser welded aluminumcopper alloy joints,a red-blue dual-beam laser source and a swinging laser were introduced for welding.T2 copper and 6063 aluminum thin plates were lap welded by coaxial dual-beam laser welding.The morphology of weld cross section was compared to explore the influence of process parameters on the formation of lap joints.The microstructure characteristics of the weld zone were observed and compared by optical microscope.The results show that the addition of laser beam swing can eliminate the internal pores of the weld.With the increase of the swing width,the weld depth decreases,and the weld width increases first and then decreases.The influence of welding speed on the weld cross section morphology is similar to that of swing width.With the increase of welding speed,the weld width increases first and then decreases,while the weld depth decreases all the time.This is because that the red laser is used as the main heat source to melt the base metals,with the increase of red laser power,the weld depth increases.As an auxiliary laser source,blue laser reduces the total energy consumption,consequently,the effective heat input increases and the spatter is restrained effectively.As a result,the increase of red laser power has an enhancement effect on the weld width and weld depth.When the swing width is 1.2 mm,the red laser power is 550 W,the blue laser power is 500 W,and the welding speed is 35 mm/s,the weld forming is the best.The lap joint of T2 copper and 6063 aluminum alloy thin plate can be connected stably with the hybrid of blue laser.The effect rules of laser beam swing on the weld formation were obtained,which improved the quality of the joints.展开更多
采用准连续光纤激光焊对锂离子电池外壳进行密封焊接,使用v|tome|x s 240检测焊缝内气孔的等效直径、球度及体积率,对气孔的等效直径和球度进行统计分析与正态分布拟合,还研究了工艺参量对气孔的体积率及形貌的影响。结果表明:锂离子电...采用准连续光纤激光焊对锂离子电池外壳进行密封焊接,使用v|tome|x s 240检测焊缝内气孔的等效直径、球度及体积率,对气孔的等效直径和球度进行统计分析与正态分布拟合,还研究了工艺参量对气孔的体积率及形貌的影响。结果表明:锂离子电池外壳焊接为激光传导焊,主要产生冶金型气孔,冶金型气孔中既有近似球形的小气孔,又有由2个以上的小气孔合并贯穿而形成的不规则的大气孔;铝壳焊缝中气孔尺寸集中在250~550μm之间,球度在0.6~0.7之间;随着激光功率的降低和焊接速度的增加,气孔的体积率呈下降趋势,但气孔形貌即球度未发生明显改变;当激光功率为450 W,焊接速度为1500 mm/min时,气孔体积率最小为1.1%。展开更多
基金supported by Guangdong Science and Technology Plan Project(Grant No.20170902,No.20180902)Yangjiang Science and Technology Plan Project(Grant No.SDZX2020063)+1 种基金Shenzhen Key Projects of Innovation and Entrepreneurship Plan Technology(JSGG20210420091802007)Yunfu 2023 Science and Technology Plan Project(S2023020201).
文摘In order to overcome the problems of many pores,large deformation and unstable weld quality of traditional laser welded aluminumcopper alloy joints,a red-blue dual-beam laser source and a swinging laser were introduced for welding.T2 copper and 6063 aluminum thin plates were lap welded by coaxial dual-beam laser welding.The morphology of weld cross section was compared to explore the influence of process parameters on the formation of lap joints.The microstructure characteristics of the weld zone were observed and compared by optical microscope.The results show that the addition of laser beam swing can eliminate the internal pores of the weld.With the increase of the swing width,the weld depth decreases,and the weld width increases first and then decreases.The influence of welding speed on the weld cross section morphology is similar to that of swing width.With the increase of welding speed,the weld width increases first and then decreases,while the weld depth decreases all the time.This is because that the red laser is used as the main heat source to melt the base metals,with the increase of red laser power,the weld depth increases.As an auxiliary laser source,blue laser reduces the total energy consumption,consequently,the effective heat input increases and the spatter is restrained effectively.As a result,the increase of red laser power has an enhancement effect on the weld width and weld depth.When the swing width is 1.2 mm,the red laser power is 550 W,the blue laser power is 500 W,and the welding speed is 35 mm/s,the weld forming is the best.The lap joint of T2 copper and 6063 aluminum alloy thin plate can be connected stably with the hybrid of blue laser.The effect rules of laser beam swing on the weld formation were obtained,which improved the quality of the joints.
文摘采用准连续光纤激光焊对锂离子电池外壳进行密封焊接,使用v|tome|x s 240检测焊缝内气孔的等效直径、球度及体积率,对气孔的等效直径和球度进行统计分析与正态分布拟合,还研究了工艺参量对气孔的体积率及形貌的影响。结果表明:锂离子电池外壳焊接为激光传导焊,主要产生冶金型气孔,冶金型气孔中既有近似球形的小气孔,又有由2个以上的小气孔合并贯穿而形成的不规则的大气孔;铝壳焊缝中气孔尺寸集中在250~550μm之间,球度在0.6~0.7之间;随着激光功率的降低和焊接速度的增加,气孔的体积率呈下降趋势,但气孔形貌即球度未发生明显改变;当激光功率为450 W,焊接速度为1500 mm/min时,气孔体积率最小为1.1%。
