During welding of structural steel members, a welder notices porosity in the weld metal. What is the most likely cause of this defect?
Correct Answer
A) Contamination from moisture, oil, or dirt on the base metal
Porosity in welds is primarily caused by gas entrapment, most commonly from moisture, oil, paint, or dirt on the base metal that creates gas when heated during welding.
Why This Is the Correct Answer
Porosity in welds is primarily caused by gas entrapment, most commonly from moisture, oil, paint, or dirt on the base metal that creates gas when heated during welding.
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