6. Defects
This section presents a non-exhaustive list of faults that can occur during MIG/MAG welding.
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Channel
The channel is a linear defect. It takes the form of a groove located at the foot of the bead (figure 11 ). This defect reduces the effective cross-section and produces a geometric accident generating a high stress intensity factor and reducing the fatigue life of the joint. It is produced by various factors:
too high a feed speed ;
incorrect torch orientation;
arc voltage too high;
too high an intensity.
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Defects
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