Why is electrode coated with a flux in shielded metal arc welding?(a) for shiny appearance of electrode(b) to make welding faster(c) to increase the melting of electrode(d) to protect the electrodeI have been asked this question during an internship interview.Question is from Welding Process in portion Welded Connections of Design of Steel Structures

Why is electrode coated with a flux in shielded metal arc welding?(a)

1.	Why is electrode coated with a flux in shielded metal arc welding?(a) for shiny appearance of electrode(b) to make welding faster(c) to increase the melting of electrode(d) to protect the electrodeI have been asked this question during an internship interview.Question is from Welding Process in portion Welded Connections of Design of Steel Structures
Answer» Correct choice is (d) to protect the electrode To EXPLAIN I would say: The electrode is coated with a flux in SHIELDED metal arc welding. Heat from electric current causes the COMBUSTION and decomposition of electrode. This creates a gaseous shield to protect the electrode, metal and molten pool from ATMOSPHERIC CONTAMINATION due to oxidation.

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