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51.

Which of the following can be non-low hydrogen process?(a) Shielded metal arc welding(b) Submerged arc welding(c) Gas-shielded metal arc welding(d) Flux core arc weldingI got this question in exam.This intriguing question originated from Welding Process in chapter Welded Connections of Design of Steel Structures

Answer»

The correct ANSWER is (a) Shielded METAL arc welding

Easy EXPLANATION: Shielded metal arc welding can be a low HYDROGEN process or non-low hydrogen process, while submerged arc welding, gas-shielded metal arc welding, FLUX core arc welding are low hydrogen process.
Discussion
52.

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.
Discussion
53.

Which of the following parameters control the quality of weld?(a) composition of electrode(b) size of electrode(c) size of metal plate(d) composition of metal plateThis question was addressed to me in an interview for internship.Enquiry is from Welding Process in section Welded Connections of Design of Steel Structures

Answer» RIGHT option is (b) size of electrode

The explanation: The parameters control the quality of WELD are size of electrode and the current that produces sufficient HEAT to melt the base METAL and minimizes electrode SPLATTER.
Discussion