Does the coating on a metal affect the effectiveness of ultrasonic welding?

Ultrasonic metal welding relies on vibration and pressure to bond materials at the interface, while the coating changes the physical properties of the metal surface, thus affecting energy transfer and the actual contact state.

Different types of plating (such as tin plating, nickel plating, etc.) vary in hardness, ductility and thickness, which will have different effects on the welding process.

For example, softer coatings are more likely to participate in deformation, which helps with interface bonding; while harder or thicker coatings may affect vibration transmission to some extent, narrowing the welding window.

In addition, the adhesion of the coating is also crucial. If the coating is not firmly bonded, interface instability may occur during the welding process, thus affecting the consistency of the solder joints.

In practical applications, it is usually necessary to combine material combinations, coating types and structural forms, and adjust and verify process parameters to obtain stable and reliable welding results.