... to workpieces being held together under pressure to create a solid-state weld. It is commonly used for plastics, and ... . In ultrasonic welding, there are no connective bolts,nails,soldering materials, or adhesives necessary to bind the materials together.What we ... thick ,this process will not join them. This is the main obstacle in the welding of metals. However, wires,microcircuit connections,sheet ...