RRB ALP Welder Trade — Solved Practice Question Bank

Q: Which gas welding flame type is used for most general steel welding? Sol: Neutral flame — a balanced oxygen-acetylene mixture that avoids the carburizing effect of excess acetylene or the oxidizing effect of excess oxygen. Q: Why is TIG welding preferred for critical, thin-material joints despite being slower than MIG? Sol: TIG gives the cleanest, most precise, highest-quality weld with excellent control over heat input, making it ideal for thin sections and critical applications like aerospace or pipe welding. Q: What type of current generally gives a smoother, more stable welding arc — AC or DC? Sol: DC (Direct Current).

Q: What is the key temperature threshold that distinguishes brazing from soldering? Sol: 450°C — filler metals melting above 450°C classify the process as brazing; below 450°C, it is soldering. Q: What eye condition can result from welding arc exposure without proper eye protection? Sol: "Arc eye" (photokeratitis) — a painful UV-radiation burn of the cornea. Q: Why is ventilation especially critical when welding galvanized (zinc-coated) steel? Sol: Welding galvanized steel releases zinc oxide fumes, which can cause "metal fume fever" if inhaled without adequate ventilation or fume extraction.