Ultrasonic waves are used for making holes in very hard materials such as glass, diamond etc., When they are passed through these materials it creates air bubbles. These air bubbles collapse within a short span of time, thereby releasing a large amount of pressure and temperature which are used for cutting and drilling.

Some materials cannot be welded at high temperature. In such cases the welding can be done at room temperature using ultrasonic waves and is called as cold welding.

Ultrasonic waves can also be employed in cleaning motors, aeroplanes, electronic assemblies etc., Here the cleaning tank is partially filled with detergent solutions. The article to be cleaned is placed in this tank. Ultrasonic waves are imparted to the solution, which accelerates the molecules in the liquid to move with high kinetic energy. These particles strike  the dirt particles and clean it.

They are used in coagulation (changing from liquid phase to a semi solid phase) and crystallization, hence can be used in the manufacturing of paints, polishes etc.,

High frequency ultrasonic waves can be sent out in the form of beams, which spreads in all directions as spherical wave fronts and passes the signals from one place to another. Thus ultrasonic sound beam is used for the purpose of signaling to a distant ship.

Echo sounding is the principle used to find the depth of the sea. A beam of ultrasonics is directed towards the bottom of the sea and the reflected signal is received as shown in Following fig..The time interval between the transmitted and received signal is noted and let it be 't'. If 'v' is the velocity of the ultrasonic waves, then Depth of sea = vt / 2
The depth of the sea can be directly calibrated using the instrument called as Fathometer (or) Echometer.