Wire Feed Welding Practice Test

Shielding gas must blanket the weld pool, and any blockage or obstruction in the nozzle—like spatter buildup—reduces or misdirects that gas flow. With less or uneven shielding reaching the weld area, the molten metal is exposed to air, leading to gas-related defects such as porosity and contamination. So, the effect of nozzle spatter is inadequate gas coverage at the weld. The other issues listed arise from different factors (arc behavior, filler metal amount, or geometry) and aren’t directly caused by a blocked gas path.