8515.80.00.40 - Ultrasonic welding machines

This category specifically covers ultrasonic welding machines. These apparatus utilize high-frequency sound waves to create heat at the interface of materials, thereby joining them together through a welding process. The primary application of these machines is in the joining of plastics, metals, and other materials where conventional welding methods might be unsuitable due to heat sensitivity or material properties.

This classification distinguishes itself from other HTS categories within 8515 by its exclusive focus on ultrasonic technology for joining. For instance, while the broader heading 8515 encompasses machines using electric, laser, or plasma arc processes, this specific subheading narrows the scope to only those employing ultrasonic vibrations. The sibling category, 8515.80.00.80, is a residual classification for any other machines and apparatus within the "Other machines and apparatus" group that do not fall under the specific subheadings, such as ultrasonic welding.

As this is a leaf node within the HTS, there are no further subcategories under 8515.80.00.40. Therefore, the classification criteria are focused on identifying machines whose fundamental operational principle is the generation and application of ultrasonic energy for welding or joining purposes. This includes both hand-held and bench-top units designed for industrial or commercial applications.