Which of the following automatic welding processes is likely to give maximum rate of metal deposition?

Automatic Welding Processes and Metal Deposition Rate:

Among various automatic welding processes, the rate of metal deposition is a crucial factor that determines the efficiency and productivity of the welding process. Metal deposition rate refers to the amount of weld metal deposited per unit time during the welding process. Higher deposition rates generally lead to increased productivity and reduced welding time.

Let's analyze the given options to determine which process is likely to give the maximum rate of metal deposition:

• Gas Shielded Bare Wires: This process, also known as Gas Metal Arc Welding (GMAW) or Metal Inert Gas (MIG) welding, uses a continuous solid wire electrode and a shielding gas to protect the weld pool from contamination. The deposition rate in GMAW can be high, but it is generally lower than that of submerged arc welding.
• Multiple Power Submerged Arc: Submerged Arc Welding (SAW) is a highly efficient welding process where the weld is shielded by a blanket of granular flux. When multiple power sources are used in SAW (multiple power submerged arc), it allows for the use of multiple wire electrodes simultaneously, significantly increasing the deposition rate. This process can achieve very high deposition rates, making it one of the most productive welding methods.
• Continuous Flux Covered Electrode: This process involves using a continuously fed flux-covered electrode. While it can offer good deposition rates, it is typically not as high as the multiple power submerged arc process.
• Single Wire Submerged Arc: Similar to multiple power submerged arc, but with only a single wire electrode. The deposition rate is high, but not as high as when multiple wires are used simultaneously.

Based on the analysis, the Multiple Power Submerged Arc welding process (option 2) offers the highest rate of metal deposition. This is due to the use of multiple wire electrodes and power sources, which significantly increases the amount of weld metal deposited per unit time, thereby enhancing productivity and efficiency in welding operations.