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A new approach to fibre laser welding

The new Coherent CleanWeld technology represents an integrated approach to fibre laser welding that delivers up to 80% spatter reduction, as well as minimal cracking and porosity. In addition to improved process consistency, it allows certain welding processes to be performed with up to 40% less laser power.

Coherent’s expertise in delivering unique beam intensity profiles, including the new ‘ARM’ fibre laser technology, is just one aspect of the CleanWeld approach. The company’s process-optimised delivery optics and focusing heads, extensive welding knowledge and in-house applications development capabilities, provide customers with laser welding solutions tailored to their specific requirements.

“While fibre lasers have been used in welding for over a decade, many end users are still seeking to improve part quality, production throughput, and process costs,” reports Frank Gäbler, Director of Product Marketing. “Coherent provides an integrated solution that is much more than just the laser itself. This is necessary because there are numerous factors besides the laser that affect the welding process. The real goal is to control and maximise the stability of the keyhole and melt pool during the welding process – that’s what produces superior results. But actually accomplishing this can require a variety of techniques that range from changing the intensity distribution of the focused laser spot, to introducing beam motion, to other factors like controlling vapour evacuation. CleanWeld addresses all of these areas, and the benefits of this approach are already being adopted in diverse applications, including zero-gap welding of galvanised steel, automobile powertrain component welding, and aluminium and copper welding for electric car batteries.”