What is porosity, and what are typical causes in welding?

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Multiple Choice

What is porosity, and what are typical causes in welding?

Explanation:
Porosity is gas pockets trapped in the weld metal as it solidifies, which weakens the weld and can cause leaks or corrosion sites. These pores form when gases come out of the molten metal or from contamination and aren’t vented properly as the weld cools. Common causes include moisture in the area, oil or grease, rust, and other dirty surfaces, as well as inadequate shielding that lets atmospheric gases reach the molten metal. The combination of contaminants and poor shielding makes porosity more likely. The other options describe issues that aren’t porosity. Cracks are due to overheating and other stresses, while indentations are surface defects, not gas pockets inside the weld.

Porosity is gas pockets trapped in the weld metal as it solidifies, which weakens the weld and can cause leaks or corrosion sites. These pores form when gases come out of the molten metal or from contamination and aren’t vented properly as the weld cools. Common causes include moisture in the area, oil or grease, rust, and other dirty surfaces, as well as inadequate shielding that lets atmospheric gases reach the molten metal. The combination of contaminants and poor shielding makes porosity more likely.

The other options describe issues that aren’t porosity. Cracks are due to overheating and other stresses, while indentations are surface defects, not gas pockets inside the weld.

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