Two-step laser welding is an effective solution that overcomes the limitations of conventional single-step processes and sets new standards in the processing of absorbent plastics.

Two-step laser welding: flexibility and precision

The innovative two-step laser welding process offers a ground-breaking solution to overcome these challenges and join absorbent plastics with absorbent plastics. In the first step, the two components are melted separately and selectively on the surface before being firmly pressed together in the second step. This eliminates the need for laser-transparent material and allows thicker components to be processed without any problems.

How does it work?

Connecting partners
LA1: Absorbent joining partner 1
LA2: Absorbent joining partner 2

Assembly structure:
Joining partners are arranged in individual nests
Both joining partners have a welding rib

Joining principle
Laser energy is applied directly to the welding ribs and melts both ribs (one or more lasers are used)
After melting, the laser(s) are switched off and the joining partners are pressed together with a defined force for a defined time

Possible applications
Applications where transparent materials cannot be used
Large parts, complex welding geometries, new materials

Advantages over other processes

Economic advantages

  • Simple tools
  • Very high flexibility
    • One machine with different tools for different parts
    • Time for changing part versions ~1min
  • Minimal energy consumption
  • Very low production costs

For the process

  • Clean process – no particles
  • Precise energy distribution along the welding path
    • Speed of the laser can be adjusted in certain areas to avoid overheating
  • Easy implementation of inspection systems
    • e.g. pyrometer or thermal camera for temperature detection

For production

  • Precision parts can be assembled inside the housing prior to welding
    • Parts can be mounted inside the housing before welding
    • Maintenance effort is minimal
  • Welded parts can be unloaded by hand