Final answer:
The statement that SAW has a deposition rate nearly two times that of FCAW and four times that of SMAW is true, as SAW is a highly efficient welding process suitable for large scale applications with higher amperages and deeply penetrated welds.
Step-by-step explanation:
The statement is True: Submerged Arc Welding (SAW) does have a higher deposition rate compared to Flux-Cored Arc Welding (FCAW) and Shielded Metal Arc Welding (SMAW). Deposition rate is a measure of how much welding filler metal is deposited into a joint during the welding process, typically expressed in pounds per hour.
SAW uses a granular flux that covers the weld, which allows higher amperages to be used and results in a deeply penetrated weld with a higher deposition rate. FCAW uses a continuously fed consumable tubular electrode containing a flux and a constant-voltage welding power supply. While FCAW's deposition rate is higher than that of SMAW, it is still not as high as that of SAW. SMAW, or stick welding, uses a consumable electrode coated in flux to lay the weld, and it tends to have a lower deposition rate due to its manual nature and the need to replace electrodes frequently.
SAW's deposition rate can be nearly two times the rate of FCAW and up to four times the rate of SMAW under similar conditions, making it a highly efficient process for large scale welding applications.