Welding characteristics of ultrasonic wire bonding using 190 kHz linear, circular and square
vibration loci and a 600 kHz linear vibration locus are studied. High-frequency systems at 90–780 kHz have been shown to be significantly effective in comparison to a conventional system at
60 kHz. Aluminum wire welding specimens 0.1 mm in diameter have been successfully joined.
Temperature increases at welding parts are measured from the thermoelectromotive force
between the aluminum wire and copper plate specimens, and deformation at welded parts of wire
specimens are measured using a digital height gage. Complex vibration welding tips at 190 kHz,
which vibrate in elliptical to circular or rectangular to square shapes at either the same or different
frequencies, are effective in joining welding specimens successfully in shorter welding times,
under smaller vibration amplitudes and over wider good welding areas. A high-frequency 600 kHz system with a linear vibration locus is also effective for successful wire bonding. Both the
temperature increase and wire deformation correlate well with the weld strength.
A photo-ionization detector operated on alternating current using a lock-in amplifier was studied. Output current of covered electrodes with insulator was proportional to concentration of volatile organic compounds. And contamination made little effect on the current value.
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