Which of the following statements is true regarding SMAW?

The statement that SMAW is a non-pressure process is accurate because Shielded Metal Arc Welding primarily generates heat through an electric arc created between the electrode and the workpiece, rather than relying on physical pressure to join materials together. The primary mechanism for fusion in SMAW involves melting the base metals and the electrode filler material due to the intense heat produced by the arc.

In this process, the weld joint is formed as the molten metal cools and solidifies, which means the success of the weld is not contingent upon applying mechanical pressure. This distinguishes SMAW from other welding methods that may require significant pressure to facilitate metal joining.

In contrast, the other options presented introduce concepts that do not accurately reflect the nature of SMAW. While it is essential to ensure operational safety and correct environmental conditions during welding, the critical characteristic that defines SMAW is its ability to operate effectively without the need for pressure in the joining process.