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Ultrasonic Soldering is available in manual soldering and robotic soldering systems and is designed to apply high-frequency vibrational energy to a molten filler metal to solder parts without flux. Ultrasonic soldering also creates strong attachments through mechanical and chemical bonds. The vibrational energy forces the liquid solder into tiny crevices and pores in the substrates which helps to seal the parts and greatly increase the surface area to which the solder can bond. Chemical bonding uses a special solder which usually has trace amounts of aluminum, beryllium, indium, silicon, silver, titanium, zinc and rare earth elements. These have a strong affinity with oxygen and tend to form oxides that chemically bind to glass, ceramics and metals. This solder is available from Fancort in leaded or lead free composition.