Final answer:
In the SAW process, a visible arc usually indicates that the process is functioning properly, although it typically should be submerged under flux. Other issues like running out of filler wire or using incorrect voltage do not typically result in a visible arc.
Step-by-step explanation:
When the arc is visible in the Submerged Arc Welding (SAW) process, it indicates that the process is working properly. In SAW, the arc should be submerged under a blanket of flux, which protects the weld zone from atmospheric contamination and stabilizes the arc. However, if problems occur, such as the flux being blown away or insufficient flux coverage, the arc might become visible. This should be addressed, but it indicates the process is still functioning and the arc is maintained. Other issues such as a filler wire running out or incorrect voltage can indeed cause problems, but they generally do not result in a visible arc; instead they might lead to arc extinction or irregular welding characteristics.