​What Can Cause Porosity (Tiny Bubbles) to Form on Some

question 5

Multiple Choice

​What can cause porosity (tiny bubbles) to form on some welds on mild steel?

• A) ​A chemical reaction between the filler metal and the mild steel.
• B) ​Using the wrong type of tungsten electrode.
• C) ​Small pockets of CO2 trapped inside of the steel during manufacturing.
• D) ​Too much heat and the metal begins to boil.

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