Red Seal Trades › Welder (456A) › Oxy-Fuel & Cutting Processes
Oxy-Fuel & Cutting Processes makes up about 16% of the 456A Welder Red Seal exam. Below are 5 free practice questions from this block, each with the answer and a plain-English explanation of why it is right.
Practice all 14 Oxy-Fuel & Cutting Processes questions →1.Oxy-fuel cutting of steel works because:
Why: Oxy-fuel cutting = rapid oxidation. Preheat to cherry red → high-pressure O₂ jet → iron + O₂ = iron oxide (slag) + heat. The heat sustains the reaction. Only works on ferrous metals.
2.When shutting down oxy-acetylene equipment, the correct sequence is:
Why: Shutdown: close torch acetylene → close torch oxygen → close acetylene cylinder → close oxygen cylinder → open torch valves to bleed lines → close torch valves.
3.Air carbon arc gouging (CAC-A) removes metal using:
Why: Carbon electrode arc melts base metal. High-pressure air jet behind the electrode blasts molten metal out, creating a U-shaped groove. Used for back-gouging, defect removal, and preparation.
4.Brazing differs from welding in that brazing:
Why: Brazing: base metal does NOT melt. Filler metal flows into the joint by capillary action. Strong joints without distorting the base metal. Used for dissimilar metals.
5.Drag cutting speed is indicated when the cutting stream exits the bottom of the plate:
Why: Slight drag (cutting stream exits slightly behind entry): normal, indicates reasonable speed. Too much drag: too fast, incomplete cut. No drag/leading: too slow, wasting gas.
9 more Oxy-Fuel & Cutting Processes questions inside
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