摘要
以LF6铝合金作为实验材料,采用搭接的方式进行激光点焊实验,研究了激光功率、点焊持续时间对点焊过程和焊点尺寸的影响规律。实验结果表明:激光功率较低时,形成的焊点尺寸有较大差异,点焊过程受工件表面状态的影响而存在不稳定性;激光功率较大时,容易引起等离子体的膨胀,导致到达工件表面的能量大大减低。激光功率主要影响焊点的熔透状态,而对焊点尺寸影响很小;点焊持续时间主要影响焊点的整体尺寸,焊点表面、熔合面和背面直径均随着点焊时间的增加而近似线性增加,其中焊点背面尺寸增加速度最快;点焊时间对焊点表面下塌的影响较激光功率更大。
Experiment of laser spot welding of aluminum alloy was carried out and the effects of laser power and pulse duration on process and laser welding spot dimension were investigated.The experimental results indicate that the welding spot dimension was variable due to the different surface condition when laser power was low.It is discovered that the plasma is larger and more unstable with the increase of laser power.Laser power mainly affects solder joint penetration,but has little effect on the welding spot dimension.The laser pulse duration affects the welding spot dimension mainly.The welding spot surface,bond interface and bottom diameter increase with the laser pluse duration,and the bottom diameter increases with the fastest speed.At the condition of full penetration,the effect of pulse duration on surface crater is more significant than laser power.
出处
《红外与激光工程》
EI
CSCD
北大核心
2011年第4期659-663,共5页
Infrared and Laser Engineering
基金
中国博士后科学基金(20090460885)
关键词
激光点焊
激光功率
点焊时间
焊点尺寸
laser spot welding
laser power
pulse welding duration
welding spot dimension
