Welding and bonding preparation for high process reliability

Innovative welding or bonding processes in automobile manufacturing require perfectly pre-treated surfaces. Depending on the task, release agents and oils must be removed or the surface must be prepared with a specific roughness in order to produce a reliable joint.  The use of lasers provides a dry, precise, and wear-free alternative to the conventional wet chemical or abrasive blasting methods. By use of a flexible setup with an adaption of a special beam shaping unit, the surface can be prepared in a defined manner.

Welding preparation by selective laser cleaning

Production residues, oxide layers and protective coatings have to be removed from the bonding surfaces of the parts.  The surface of the base material remains unchanged, because the required energy density for removal is significantly below the ablation threshold for metals.

Using a scanning beam deflection, in which the focused beam of a pulsed laser is guided over the surface at a speed of several m/s, the parts can be processed in a defined manner. Typical ablation rates vary between 10 – 100 cm²/s depending on laser power and coating.

4JET offers its Parts Cleaning Systems (PCS) as well as customized solutions for selective, flexible laser processing .