Question

two methods for starting smaw are a scratch start and a tapping start.
which one is preferred?

scratch start
tapping start

Explanation:

Compare SMAW arc starting methods

Using the SMAW Arc Initiation knowledge point

• Scratch start: The electrode is dragged across the metal surface like striking a match. This method is generally preferred because it is easier for beginners to master and prevents the electrode from sticking to the workpiece.
• Tapping start: The electrode is tapped straight down onto the metal and quickly lifted. This method is more prone to sticking if the lift is not timed perfectly, making it less preferred for general starting.

Answer:

• (A) Scratch start (Correct answer)
• (B) Tapping start