What is Ultrasonic Brazing?

What is Ultrasonic Brazing? Ultrasonic Soldering Lab Trials – Sonic4Lab

Ultrasonic brazing is a welding technology that uses ultrasonic vibration energy to assist in heating brazing materials and achieve the connection of dissimilar or identical metal materials. The core is to destroy the surface oxide film of the welded part through ultrasonic waves, without the need for high-temperature flames or arcs. This process has the advantages of low welding temperature (avoiding material thermal deformation), no need for flux (green and environmentally friendly), and high joint quality, and has been widely used in the fields of aerospace, electronic packaging, and automotive manufacturing. Research has shown that ultrasound can optimize the structure of intermetallic compound layers and significantly improve the reliability of welded joints.

Its key features and principles are as follows:

1. Core principle: Ultrasonic waves (usually with a frequency of 15-70kHz) act on the welded parts and brazing materials, generating high-frequency vibrations to remove the oxide layer and oil stains on the metal surface. At the same time, auxiliary brazing materials (with a melting point lower than the base material) are heated, melted, and wet the surface of the base material, forming a firm joint after cooling.

2. Main advantages: Low welding temperature (far below the melting point of the base material), which can avoid deformation and grain growth of the base material; Especially suitable for welding easily oxidizable light metals such as aluminum and magnesium, as well as precision electronic components such as sensors and connectors.

3. Typical applications: Widely used in electronic industry (such as circuit board lead welding), refrigeration industry (copper aluminum tube connection), medical equipment and other scenarios that require high welding accuracy and base material protection.

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