Scanner unit for dynamic beam manipulation

Description

A high beam quality doesn't only have advantages!

The constant development of lasers for material processing leads to permanent enhancement of beam quality und therefore to smaller focus diameters at high power. For laser welding applications a high quality beam source also has disadvantages, i.e. welding of conjunctions with  gaps or tolerances of position of 100 µm and more.

The first method to increase the beam diameter in the process is by defocusing. It shows that this procedure is in most cases not helpful. By defocusing the laser beam the power density on the work piece changes. This could cause instabilities in the process. Also it is possible that the necessary power density can not be reached which makes processes like key hole welding impossible.

It is useful to adept the beam shape on the surface of the work piece to the requirements of the process the geometrie of the component. With the help of a high-dynamic beam guide like the ILV-LS scanner module the advantages and capabilities of expensive, high quality laser sources for laser material processing can be used unrestricted. 

This way of dynamic beam manipulation seperates itself from other process strategies like moving galvo or polygon scanner units. Its capabilities of high power limits, low costs and easy integration or upgrade are the main advantages compared to those other scanners.

The power density rules the process!

The table below shows the largest possible beam or seam width on the example of a fiber laser with 2000 W average power and a focus diameter of 100 µm.

Focus on dynamic beam manipulation!

Typical applications of the ILV-LS scanner module 

• key hole welding
• conduction welding
• laser tempering
• laser soldering

Advantages, potentialities, features

• optimized and application-specific laser power density
• gab bridging during welding
• upt o 30 kW laser power
• quick and easy installation and integration
• high-dynamic control of laser power within one mirror oscillation
• analog interface for metrology (i.e. weldseam tracking)
• process gas guidance
• manipulation of weldseam diameter depending on the geometry of the component or the material
• weldseam optimization
• line scanner with variable power density
• variable spot diameter for tempering
• scan frequency up to 2000 Hz

      

Conjunctions with big gaps                                                                             weldseam with variable power density                                     Tube weldseam with 1,8 mm seam width and tolerance of position

Technical proerties of ILV-LS-30