Welder Red Seal · Question
During a visual inspection of a multi-pass groove weld, you observe several small, rounded voids on the surface of the weld bead. The welding process used was Gas Metal Arc Welding (GMAW) with shielding gas. What is the most likely cause of these discontinuities?
Small, rounded voids (porosity) on the weld surface are often caused by the entrapment of gas due to inadequate shielding gas coverage during GMAW, preventing t
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Question: During a visual inspection of a multi-pass groove weld, you observe several small, rounded voids on the surface of the weld bead. The welding process used was Gas Metal Arc Welding (GMAW) with shielding gas. What is the most likely cause of these discontinuities?
Answer options:
- Insufficient arc length
- Excessive travel speed ✅ Inadequate shielding gas coverage
- Too high welding current
Correct answer: Inadequate shielding gas coverage
Explanation: Small, rounded voids (porosity) on the weld surface are often caused by the entrapment of gas due to inadequate shielding gas coverage during GMAW, preventing the molten weld puddle from being protected from atmospheric contamination. Insufficient arc length or excessive travel speed typically lead to other issues like lack of fusion or narrow, ropey beads.
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