Bolt-Clamped Langevin Transducers (BLT) are key components in high-power ultrasonic systems. Their robust bolt-clamped structure ensures excellent mechanical stability and durability, making them suitable for demanding industrial processes such as cutting, cleaning, and welding of plastics, metals, and specialized materials.

As the core element of ultrasonic welding equipment, BLTs efficiently convert electrical energy into high-frequency mechanical vibrations. These vibrations create localized frictional heat at the interface between materials, enabling fast, clean, and energy-efficient bonding of thermoplastics or metals, without the need for adhesives or solder.

Working Principle

• Conversion of Electrical Energy to Mechanical Energy
  The transducer receives a high-frequency, high-voltage electrical signal and converts it into mechanical vibrations via the inverse piezoelectric effect. These vibrations are finely tuned to the system’s resonance frequency, ensuring maximum acoustic energy transfer and stable performance.
• Generation of Frictional Heat
  The mechanical vibrations are transmitted through a booster and welding horn to the workpieces. These high-frequency oscillations cause microscopic frictional motion at the interface, generating localized heat that rapidly softens or melts the material within milliseconds without the need for external heating sources.
• Formation of Weld
  When the ultrasonic excitation stops, the molten or softened material cools and solidifies under applied pressure, forming a metallurgical or molecular bond between the components. The resulting weld demonstrates high mechanical strength, low electrical resistance, and excellent structural integrity, suitable for joining both homogeneous and heterogeneous materials, including metals and thermoplastics.

Key Features and Advantages
Unictron’s BLT transducers offer the following performance advantages for advanced welding applications:

• High-Speed Operation
  Enables extremely short welding cycles, ideal for high-volume, automated production.
• Cost Efficiency
  Eliminates the need for additional consumables such as adhesives or soldering materials.
• Energy-Saving and Environmentally Friendly
  An eco-efficient process characterized by low energy consumption and no harmful emissions.
• High Joint Strength and Reliability
  Delivers strong, low-impedance joints, essential for electronic and electro-mechanical assemblies.
• Versatility and Material Compatibility
  Capable of welding thermoplastics and metals, including similar and dissimilar materials, with consistent precision.

Applications

Bolt-Clamped Langevin Transducers (BLT) are widely used in:

• Electronics Industry
• Automotive Industry
• Medical Device Manufacturing