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  1. Atomic hydrogen welding 
  2. Thermit welding
  3. Submerged arc welding
  4. Percussion welding
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1 Answers

Option 3 : Submerged arc welding

Explanation:

  • Submerged arc welding is an arc welding process in which heat is generated by an arc which is produced between bare consumable electrode wire and the work-piece.
  • The arc and the weld zone are completely covered under a blanket of granular, fusible flux which melts and provides protection to the weld pool from the atmospheric gases.
  • The molten flux surrounds the arc thus protecting arc from the atmospheric gases.
  • The molten flux flows down continuously and fresh flux melts around the arc.
  • The molten flux reacts with the molten metal forming slag and improves its properties and later floats on the molten/solidifying metal to protect it from atmospheric gas contamination and retards cooling rate.
  • A process of submerged arc welding is illustrated in Figure.

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