Treatment for Before and After Welding and Bonding
In the first of our series on the applications for automated laser cleaning, we will delve into how it is a very effective way to prepare surfaces prior to welding and bonding, as well as for after these joining processes.
How laser ablation works?
Laser ablation is the process of removing material from a solid surface via laser irradiation. Nanosecond-length pulses of laser light are sent towards the surface to be cleaned and by precisely controlling laser parameters such as wavelength, pulse duration and energy intensity, the target material is sublimated and removed without damaging the underlying substrate.
Laser Cleaning for Welding
Laser cleaning is a compelling option for those looking to ensure high quality welds that are free of inclusions and porosities. It is remarkably effective at removing contaminants and impurities like rust, oil, oxide layers and residue from metallic surfaces. Traditional techniques such as media blasting can damage the underlying material causing micro abrasions and stress points which in turn can result in a weakened weld joint that eventually fails. Laser cleaning is also an ideal method for cleaning between passes on a multi pass weld joint and for post-welding to remove oxidation and slag.
Laser Cleaning for Adhesive Bonding
Automated laser cleaning allows for quick and accurate cleaning of surfaces prior to adhesive bonding. If oxides, oils, and mould releases are present on the surface of a part to be bonded, the adhesive will chemically adhere to those contaminants which in turn can lead to a weaker bond. Methods such as solvent wiping and abrading are not as effective at removing all these substances, resulting in reduced penetration in the bond. Moreover, by adjusting the pulse frequency of the laser cleaning system, you can create a consistent but roughened surface that is ideal for creating a strong bond.
In Automotive
Correctly cleaned surfaces are essential for joining parts in automotive production. The assembly tasks laser cleaning can be useful for include:
- Structural frame bonding
- Welding door frames and gears
- Electronic control unit bonding
- Pre-treating shafts and lamination stacks for rotor production
- Bonding preparation for plastics parts