Discussion
Neutral flame is used to weld metals like......
Answer: A
The neutral flame is used to weld steel.
A neutral flame burns oxygen and acetylene in roughly equal proportions. It neither adds carbon to the metal nor oxidises it, which is what mild steel and most ferrous work need, so it is the standard welding flame.
Copper and brass go with the oxidising flame. The list in the last option, aluminium, stainless steel, zinc die casting, nickel and monel, is the textbook list for the carburising (reducing) flame, and carburised steel is not the neutral flame's typical application.
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