The first plastic car was put together using what welding process?

Plastic was welded together using ultrasonic friction. This is the process by which two materials are joined using friction caused by high-intensity acoustic sound waves. While plastic cars haven't caught on, this process of joining plastic has. The sounds cause the plastic to meld together and form an unbreakable bond.

Asked by Jennifer Sinclair · Last updated 5 years ago · 51K views · SOURCE