Plasma Cutter or Gas Torch – Which One Should You Be Using?
If you’ve spent any time in sheds around places like Invercargill, Timaru, Palmy, Rotorua, Whangārei, or out on a farm somewhere in the middle of nowhere, you’ve probably seen both:
Plasma cutters.
And oxy-acetylene gas torches.
Both will cut steel.
Both have been around forever.
But they are not the same tool, and one of them usually makes a hell of a lot more sense for normal home and small workshop work.
This isn’t a “which one is king of the world” argument.
It’s more:
What actually works best in a real shed… With real budgets… Doing real jobs.
Because marketing makes plasma cutters sound like magic. And gas cutting gets treated like ancient dinosaur tech.
Truth is, both still have a place.
But most people only need one of them.
Let’s talk about it in plain English.
How Oxy-Acetylene Cutting Works (No Fancy Talk)
Oxy cutting is basically controlled burning.
You mix oxygen and acetylene gas.
Light it.
Heat the steel until it’s glowing.
Hit the oxygen lever.
Steel burns and blows away.
That’s it.
No electricity.
No circuit boards. Just fire and gas.
It’s old-school.
It works.
And it’s been used on farms and in workshops for decades.
How Plasma Cutting Works (No Fairy Dust)
Plasma uses electricity and compressed air.
Electricity turns the air into superheated plasma.
That plasma melts the steel.
The air blows the molten metal out of the cut.
Instead of burning steel like gas, plasma melts and ejects it.
Most home plasma cutters:
Plug into normal single-phase power.
Use a regular compressor.
Sit under a bench when not in use.
No bottles.
No refills.
No rental.
That alone is a big deal.
Cutting Thickness – Where People Get Carried Away
This is where the bullshit starts.
Everyone wants to cut huge steel.
“I want to cut 20mm plate.”
“Maybe thicker one day.” “Just in case.”
Reality check:
Most home jobs are:
3–6mm sheet
Flat bar
Angle iron
Trailer brackets
Patches Light plate
Not shipbuilding.
Gas will cut very thick steel.
Way thicker than any cheap home plasma cutter.
Most home plasma cutters are happy around:
6–10mm clean
12mm if you go slow
Thicker than that = pushing it
For most home sheds:
10mm clean cutting is a realistic expectation.
Cost to Run – Where Plasma Starts Winning
Gas:
Oxygen bottle
Acetylene bottle
Refills
Sometimes rental
Plasma:
Electricity
Compressed air
Consumables
If you already own a compressor, plasma is far cheaper long term.
Convenience
Gas cutting:
Drag bottles out
Connect hoses
Set pressures Light torch
Plasma cutting:
Plug in
Connect air Pull trigger
For quick jobs, plasma smashes gas.
Speed on Thin Steel
Plasma murders thin steel.
Gas will do it.
But slower.
And with more heat.
More heat = warped steel.
Cut Quality
Plasma:
Narrow cut
Cleaner edge
Less slag Gas:
Wider kerf
More cleanup
Less grinding = happier life.
The Real Shed Rant
Gas feels like: “I need to plan this.” Plasma feels like:
“I’ll just cut that off.”
Most home jobs are impulse jobs.
Plasma suits that mindset.
When Gas Still Makes Sense
Very thick steel
Heating and bending
Already own bottles
What Suits Most Home Garages?
Plasma cutter.
Cheaper to run
Cleaner cuts
Less setup
No bottle headaches
Plasma cutters use consumables:
Tips
Electrodes Swirl rings
We stock plasma torches and consumables in NZ and ship nationwide.
Fresh consumables = better cuts.
Bottom Line
Oxy-acetylene:
Better for very thick steel and heating.
Plasma cutter:
Better for thin to medium steel and everyday shed work.
Start with plasma.
