SMAW leaves slag behind after welding.

• A. True
• B. False
• C. Sometimes
• D. Not always

Answer: (A)

SMAW uses a flux-coated electrode, and the flux melts during welding to form a protective slag over the weld pool. This slag cools and solidifies on top of the bead, shielding the molten metal from the air and helping to trap impurities. After welding, the slag is chipped or ground away to reveal the weld and to prepare for any additional passes. Because the flux turns into slag as part of the process, leaving slag behind is normal, so the statement is true. The amount and removability of slag can vary with electrode type and welding conditions, but SMAW inherently produces a slag layer that must be removed.