Welder Red Seal · Question
What is the most common cause of porosity in a GMAW weld?
Porosity (gas pockets in the weld metal) in GMAW is most frequently caused by inadequate shielding gas protection, which allows atmospheric contaminants (like o
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Question: What is the most common cause of porosity in a GMAW weld?
Answer options: ✅ Insufficient shielding gas coverage or contamination
- Too high welding travel speed
- Incorrect electrode stick-out
- Excessive preheat temperature
Correct answer: Insufficient shielding gas coverage or contamination
Explanation: Porosity (gas pockets in the weld metal) in GMAW is most frequently caused by inadequate shielding gas protection, which allows atmospheric contaminants (like oxygen and nitrogen) to enter the molten weld pool. Contaminated base metal or filler wire can also contribute.
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