Question

quiz
question 4 of 6

select one way to correct porosity:

reduce travel speed
decrease amperage
use a larger electrode
reduce arc length

Explanation:

Analyze the cause of porosity

Using the Porosity knowledge point

Porosity is caused by gas entrapment in the solidifying weld pool. A primary cause of porosity is an excessively long arc length, which destabilizes the shielding gas envelope and allows atmospheric contamination (oxygen and nitrogen) to enter the weld pool.

Evaluate the corrective actions

Using the Porosity knowledge point

• Reduce travel speed: While travel speed affects heat input, it is not the primary corrective action for atmospheric contamination.
• Decrease amperage: Lowering amperage does not directly address gas shielding issues.
• Use a larger electrode: Electrode size is selected based on joint design and thickness, not to prevent porosity.
• Reduce arc length: Shortening the arc length stabilizes the arc and maintains a tight shielding gas pocket, preventing atmospheric gases from contaminating the weld and causing porosity.

Answer:

• Reduce travel speed
• Decrease amperage
• Use a larger electrode
• Reduce arc length (Correct answer)