5083的激光传导焊接

Laser Conduction Welding of 5083

研究了利用高能量的二氧化碳和YAG激光器作为于激光传导焊接2mm～3mm板厚的AA5083。结果表明,焊接2mm～3mm板厚的AA5083时产生的粗大的焊接区并充分渗透。通过观察,在这个过程中渗透深度最初开始增加并达到最大值,然后随着斑点大小的增加而逐渐减小。

There are two laser welding mechanisms： keyhole mode and conduction mode.Keyhole welding is widely used because it produces welds with high aspect ratios and narrow heat affected zones.However keyhole welding can be unstable,as the keyhole oscillates and closes intermittently.This intermittent closure causes porosity due to gas entrapment.In this work,high-power CO2 and YAG lasers have been used to produce laser conduction welds on 2mm and 3mm gauge AA5083 respectively by means of defocused beams.Full penetration butt-welds of 2mm and 3mm gauge AA5083 using this process has been produced.It has been observed that in this regime the penetration depth increases initially up to a maximum and then decreases with increasing spot size（corresponding to increase in distance of focus above the workpiece）.