Abstract
In recent years, GSI Lumonics has undertaken a number of research initiatives to optimize Nd: YAG laser power and utilize it to its fullest capacity. Our work has centered on high average power (400W-2000W) CW systems, which operate in continuous wave mode but can also pulse or modulate the output power, raising peak powers over 2 times their conventional CW rating. Lumonics pioneered this technique in early 1990 and offers several benefits in welding and cutting.This paper describes the cutting trials carried out on zinc-coated steels (up to 20µm thick) and aluminium alloys with super-modulated Nd: YAG CW laser. The results show that modulation reduces uncontrolled burning whilst retaining process speed and stability. This technique also improves off-normal cutting by 100% in aluminium alloys and 400%in the zinc-coated steels. In cutting aluminium alloys it increases the maximum material thickness which can reliably be cut and it allows average power to be reduced when cutting complex profiles without re...
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