Multiple choice general knowledge science & technology The gases used in different types of welding would include oxygen and hydrogen oxygen, hydrogen, acetylene and nitrogen oxygen, acetylene and argon oxygen and acetylene Reveal answer Fill a bubble to check yourself D Correct answer Explanation Oxy-acetylene welding uses oxygen and acetylene to create an extremely hot flame (~3200°C) suitable for welding and cutting metals. Acetylene provides the fuel, while oxygen supports complete combustion.