Considering that the propeller is the ship's propulsion element and without it working together
with the engine, the ship is going nowhere and with the passage of time since its invention in
1827. It comes more and more being modernized in its manufacturing process and model,
being manufactured with more suitable and resistant materials, because nowadays we have
larger ships and more powerful engines and therefore the propeller needs to keep up with this
evolution. in order to study more about the propagation of cracks that occur along the
contours of the grains. Therefore, it is necessary to know what caused great vibrations in the
main axis and hull of the ship, and to discuss an analysis, an inspection and report the failure
and cause of fracture of the material. Descriptive research is then carried out. Therefore, it
appears that due to damage to the propeller as a result of the impact with a supposed tree
trunk during navigation on the Amazon River, then the performance recovery generated a
tension in the affected area, due to this propeller performance generated in the affected area a
crack that was welded to repair it and finally it resulted that the right thing to do was to have
to reduce the four blades evenly to maintain the balance of the propeller and end the excessive
vibration in the ship, which imposes the finding that what led to the fracture of the helix in the
repaired area was an intergranular corrosion. The granular corrosion that is, the propagation of
cracks that occurs along the grain boundaries, is the rupture in the propeller blade.
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