Vibration Welding
Technology
Vibration Welding is plastics welding process, in which two work pieces are vibrated at certain frequency and ampltude. The parts rubb each other under a pressure causing a friction between their surfaces, which generates heat. The heat results in melting polymer in the joint region. The work pieces are fused together and after a predetermined time the vibration stops. The polymer molecules are cross-linked when the work pieces cool down, forming a strong joint.
Vibration Welding cycle is very short (milliseconds). The frequency of acoustic vibrations is in the range 100 to 500 Hz (commonly 100-240 Hz). The ampltude of the vibrations is about 0.02-0.2” (0.5-5 mm).
Most polymers (amorphous, semicrystalline and crystalline) produced various fabricationmethods (Thermoforming, Extrusion, Injection molding, Blow molding,Compression molding, Transfer molding) may be welded by Vibration Welding.
Vibration Welding is used in automotive and domestic appliance industries.
- Oxidizing polymers may be welded
- Easily automated
- High productivity
- Large and complex parts may be welded
- Relatively expensive equipment
- Minimum rigidity required
