In FCAW, atmospheric shielding is ____.
A) provided solely by flux sealed within the tubular electrode
B) provided completely through a nozzle in the same way as GMAW
C) not necessary
D) provided by flux sealed within the tubular electrode, but extra shielding may be supplied through a nozzle as in GMAW

Question

Quizplus · Accepted Answer

Atmospheric shielding in FCAW is primarily provided by the flux sealed within the tubular electrode, but extra shielding may be supplied through a nozzle as in GMAW. This is because FCAW electrodes have a flux core that contains materials like titanium dioxide, silica, and calcium fluoride that vaporize upon contact with the arc heat, producing a shielding gas. However, in windy or drafty environments, additional shielding gas may be necessary to protect the weld from contamination.

In FCAW, Atmospheric Shielding Is ____