What is a common cause of weld porosity?

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Prepare for the Carver NOCTI Collision Repair and Refinishing Technology Test. Utilize multiple choice questions with hints and explanations. Elevate your chances of success and become a certified professional in the collision repair industry!

Multiple Choice

What is a common cause of weld porosity?

Explanation:
Porosity forms when gas gets trapped in the molten weld metal as it cools. The weld pool must be protected from air by a steady shield of shielding gas, so any break in that shield allows air pockets to form. Contaminated metal—oil, grease, moisture, rust, or paint—releases gases or weakens the shield, and improper shielding gas flow (too little, leaks, or incorrect nozzle distance) lets air reach the weld pool. Keeping the metal clean and ensuring proper shielding gas flow and coverage is the key to preventing porosity.

Porosity forms when gas gets trapped in the molten weld metal as it cools. The weld pool must be protected from air by a steady shield of shielding gas, so any break in that shield allows air pockets to form. Contaminated metal—oil, grease, moisture, rust, or paint—releases gases or weakens the shield, and improper shielding gas flow (too little, leaks, or incorrect nozzle distance) lets air reach the weld pool. Keeping the metal clean and ensuring proper shielding gas flow and coverage is the key to preventing porosity.

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