What is the purpose of anti-spatter in GMAW and when should it be applied?

• A. Anti-spatter reduces spatter adhesion to the weld and surrounding surfaces; apply before welding and reapply as needed when contamination occurs.
• B. Anti-spatter increases spatter production.
• C. Anti-spatter changes the color of the bead.
• D. Anti-spatter is only decorative.

Answer: (B)

Anti-spatter is a protective coating used in GMAW to prevent molten spatter from sticking to the weld area and surrounding surfaces. By forming a barrier on surfaces like the base metal near the joint, the nozzle interior, and the contact tip, it makes cleanup easier, reduces spatter buildup that can cause defects or downtime, and helps extend the life of welding hardware.

It should be applied before you start welding as a light, even film on the work area and any surfaces that will be exposed to spatter. Reapply as needed when you notice contamination or after breaks in welding, since the coating can wear off with time and handling. Use the product according to its directions for the best results.