This study has demonstrated that a large part of the variation in
bond shear strength is explained by the bond shape (as expressed
by the ball diameters X and Y and the ball height Z). With this
information, a visual inspection of the bond shape can then be
used as an initial gauge of the bond quality prior to bond shear
testing during wirebonder shiftly set-up. This is an added
advantage to a manufacturing environment with less shear testing
required, shear testing being a time consuming process.
Furthermore, during actual bonding, real-time inspection of the
bond shape could indicate whether wirebonding parameters are
still operating within the required set levels