Which practice helps prevent porosity due to moisture in electrode coating?

• A. Dry electrodes before use
• B. Store electrodes in a humid area
• C. Use a larger electrode
• D. Increase travel speed

Answer: (B)

Moisture in the electrode coating can decompose during welding and release hydrogen, which gets trapped in the weld and forms porosity. Drying the electrodes before use removes that moisture, drastically reducing hydrogen in the weld pool and preventing porosity. Storing electrodes in a humid area would add moisture to the coating, increasing the risk of porosity. Using a larger electrode or increasing travel speed doesn’t address the moisture content of the coating and won’t prevent hydrogen-induced porosity. The practical approach is to keep electrodes in a dry place and dry them as recommended by the manufacturer if moisture is suspected.