真空激光焊接焊缝成形及等离子体特征

发布时间：2018-11-21 06:55

【摘要】：为减小等离子体对激光焊接过程的干扰,扩宽大功率激光焊接的应用范围,对真空条件下激光焊接的焊缝成形和等离子体特征进行了研究。结果表明,真空激光焊接可以改善激光焊接表面成形,增加熔深。在焊接速度为0.5 m/min时,真空环境下焊缝熔深大约是大气环境下焊缝熔深的3倍。对比不同焊接速度下环境气压对熔深的影响规律发现,在焊接速度较小时,环境气压对于激光焊接的熔深影响更加明显。在真空条件下,较大的负离焦可以显著增加熔深,改善焊缝成形。等离子体图像观测结果表明,随着环境气压降低,等离子体逐渐减弱。真空环境对激光焊接等离子体强烈的抑制效应是真空激光焊接熔深增加,焊缝成形改变的一个原因。
[Abstract]:In order to reduce the interference of plasma on laser welding process and widen the application range of high power laser welding, the weld forming and plasma characteristics of laser welding under vacuum condition were studied. The results show that vacuum laser welding can improve laser welding surface forming and increase penetration. When the welding speed is 0. 5 m/min, the weld penetration in vacuum environment is about 3 times that in atmospheric environment. Comparing the effect of ambient air pressure on penetration depth at different welding speeds, it is found that when welding speed is small, the influence of ambient air pressure on penetration depth of laser welding is more obvious. Under vacuum condition, larger negative defocusing can significantly increase penetration depth and improve weld forming. The results of plasma image observation show that the plasma decreases gradually with the decrease of ambient pressure. The strong inhibition effect of vacuum environment on laser welding plasma is one of the reasons for the increase of penetration depth and the change of weld formation in vacuum laser welding.
【作者单位】：哈尔滨工业大学先进焊接与连接国家重点实验室;哈尔滨工业大学金属精密热加工国防科技重点实验室;
【基金】：中央高校基本科研业务费专项资金(HIT.NSRIF.2017003)
【分类号】：TG456.7

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