Article | REF: BM7732 V2

Semi-automatic arc welding process

Author: Alexandre BENOIT

Publication date: October 10, 2015, Review date: March 10, 2021

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6. Defects

This section presents a non-exhaustive list of faults that can occur during MIG/MAG welding.

  • 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