Welder Red Seal · Question
A welder has completed a horizontal fillet weld on a new stainless steel tank. Upon visual inspection, small, isolated spherical holes are visible on the surface of the weld bead. What is the most probable cause of this discontinuity?
Small, isolated spherical holes on the surface of a weld bead are indicative of porosity, which is most often caused by inadequate shielding gas coverage allowi
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Question: A welder has completed a horizontal fillet weld on a new stainless steel tank. Upon visual inspection, small, isolated spherical holes are visible on the surface of the weld bead. What is the most probable cause of this discontinuity?
Answer options:
- Excessive travel speed ✅ Improper shielding gas coverage
- Insufficient current
- High arc voltage
Correct answer: Improper shielding gas coverage
Explanation: Small, isolated spherical holes on the surface of a weld bead are indicative of porosity, which is most often caused by inadequate shielding gas coverage allowing atmospheric contamination. Excessive travel speed can lead to undercut or insufficient penetration, insufficient current to lack of fusion, and high arc voltage to excessive spatter and a wide, flat bead.
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