Laser welding concept
In laser welding of thermoplastics, sometimes referred to as "laser transmission welding" or "through transmission IR welding (TTIr), compatible thermoplastic materials are bonded together. The laser beam penetrates the top laser-transmissive thermoplastic and is converted into heat by either a bottom laser absorbent thermoplastic or by a laser absorbent dye at the weld interface.
During the welding process an external force is applied which clamps together both thermoplastic parts allowing for a conduction of heat from the laser-absorbent thermoplastic to the laser-transmissive thermoplastic, melting both parts and creating a bond. Thermal expansion in the welding zone creates an internal pressure and leads to a strong weld between the parts.
Bringing new techniques to maturity
Today laser welding is a recognized joining technique for thermoplastics. New applications are continually emerging while advantages over traditional joining techniques are brought to bear. Laser technology often provides solutions where conventional systems have failed or can be improved upon. Profit from our know-how and let us help develop your application.
Suitable materials
Nearly all thermoplastics and thermoplastic elastomers can be welded with laser radiation - e.g. ABS, PA, PC, PP, PMMA, PS, PBT - even those reinforced with glass fibers. The welding seam strength is comparable with that of the base material. The laser process requires a laser transmissive plastic to be bonded to a laser absorbent plastic, typically containing carbon black. Special pigments also allow welding of dark/dark and transparent/transparent combinations, as well as of colored plastics.
Nothing but advantages
Transmission Welding using laser beams offers significant advantages in welding plastics over conventional welding technologies.
- Non-contact, flexible joining technique
- Minimal thermal stress on the welded parts
- Simple joining seam geometry
- No particulate development
- Vibration-free processing
- Optically perfect welding seam
- High precision
- High strength
- Gas-tight, hermetic seals
- No tool wear
- No consumables (adhesive, fasteners, etc.)
What you get from Leister
Advice:
- Selection of the most suitable laser concept
- Material selection assistance and weldability tests
- Engineering and recommendation of suitable joining geometries
Development of processes and techniques:
- Definition of the process window for all relevant parameters
- Component testing and assessment of welding quality
- Integration of the process into the production environment
Prototypes and small series production:
- Manufacture of prototypes
- Pre-series and scale-up production
- Job shop service through Leister and its partner companies
Total customer focus
In our development laboratories, Leister scientists, engineers and technologists have developed a broad range of laser welding concepts, which have proven themselves in practice over and over again. We conduct research together with leading institutes. This lays the foundations for developing tailored solutions for almost every customer application. We are there to support you across the board: from the concept, through design and material selection, right up to process optimization and integration.