Resumo:
This work is an application of the Design and Analyses of Experiments in the
projection spot welding. The main objective was to identify the influence of some factors
of this process in the welding quality. Among many factors involved in the process as a
line pressure, weld time, power and retention time were evaluated. As a parameter for
the weld quality evaluation, the torque resistance test, interference of spatters,
deformation of the nut and consume of electric current were analyzed. To the torque
resistance, the factors power and weld time was the most important. The increase on its
level resulted in a increase of the response values. The factor stand off was identified as
a second factor more important. the interference of spatters and deformation of the nut
was influenced by this factors, but the interference of spatters increase wen the line
pressure increases too. The factor retention time showed a lower influence in the
process.
