Vibration welding

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Vibration welding Method of plastic welding two plastic parts by vibrating (rubbing) the mating surfaces together at relatively low frequencies — 90 to 120 Hz.

Contents 1 Process 2 Materials 3 Applications 4 Advantages 5 Disadvantages

Process

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).

Materials

Most polymers (amorphous, semicrystalline and crystalline) produced various fabrication methods (Thermoforming, Extrusion, Injection molding, Blow molding, Compression molding, Transfer molding) may be welded by Vibration Welding.

Applications

Vibration Welding is used in automotive and domestic appliance industries.

Advantages

• Oxidizing polymers may be welded;
• Easily automated;
• High productivity;
• Large and complex parts may be welded.

Disadvantages

• Relatively expensive equipment;
• Minimum rigidity required.