Technical Foundation
What Is a Torch and Torch Kit?
An oxy-fuel torch mixes a fuel gas (acetylene, propane, MAPP, or natural gas) with oxygen at the tip to produce a flame hot enough to cut, weld, braze or heat metal. Cutting torches use a separate oxygen jet to blow molten metal out of the kerf once a preheat flame brings the material to ignition temperature, which is why cutting torches need a higher oxygen flow than welding or heating torches of similar tip size.
Complete kits bundle a torch handle, interchangeable cutting/welding/heating tips, regulators for both gas cylinders, hoses, and a striker — sized as a set so the regulator flow capacity matches the largest tip included. Tip size (a numbered or lettered orifice size) is selected by material thickness, not by torch handle size; a kit's rated cutting capacity (e.g., up to 6in steel) reflects the largest tip supplied, not a fixed capability of the handle itself.
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| Spec | What It Means | Why It Matters |
|---|---|---|
| Fuel Gas Type | Acetylene, propane, MAPP, natural gas | Acetylene burns hottest for cutting; propane/MAPP suit heating and brazing at lower cost |
| Torch Type | Cutting, welding, heating, combination | Cutting torches add an oxygen-blast trigger; combination torches swap heads for multiple uses |
| Tip Size | Numbered/lettered orifice sizing per manufacturer | Sized to material thickness — undersized tips cut too slowly, oversized ones waste gas and warp material |
| Regulator Delivery Pressure | Rated in PSI per gas, matched to largest tip | Undersized regulator flow starves the largest tip in the kit, causing a weak or popping flame |
| Hose Rating | Grade R or T, rated working pressure | Grade T hoses are required for acetylene service above standard low-pressure limits |
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Applications
Where Torch and Torch Kits Get Used
Oxy-fuel torches are specified anywhere metal needs to be cut, joined, or heated without electric welding equipment on hand.
Structural Steel Fabrication
Cutting plate and structural shapes to size on the shop floor before welding assembly.
HVAC & Refrigeration Installation
Brazing copper line sets and fittings using propane or MAPP torches sized for tight refrigerant joints.
Automotive & Body Repair
Heating seized fasteners and cutting damaged panels or exhaust components during repair work.
Plumbing & Pipefitting
Soldering and brazing copper pipe joints in mechanical rooms and building rough-in.
Scrap & Demolition Cutting
Field cutting of structural steel and heavy sections during demolition and salvage work.
Metal Fabrication Shops
General-purpose cutting, brazing, and heating across a mixed-material fabrication workflow.
FAQ
Torch and Torch Kits Questions, Answered
What's the difference between a cutting torch and a welding torch?
A cutting torch has a trigger-operated oxygen jet built into the tip that blasts a preheated cut line to blow molten metal out of the kerf, separating the material. A welding or heating torch has no separate cutting oxygen jet — it produces a steady flame for melting filler metal or heating the workpiece, without the ability to sever material on its own.
Should I use acetylene, propane, or MAPP gas for my torch?
Acetylene burns hottest and is standard for oxy-fuel cutting where fast, clean cuts through steel are needed. Propane and MAPP burn cooler and are more common for brazing, soldering, and general heating work — they're less expensive and often preferred for HVAC and plumbing brazing where acetylene's higher heat isn't necessary.
How do I pick the right torch tip size?
Tip size is selected by material thickness, following the manufacturer's tip chart (tip sizes are not standardized across brands, so a Victor-style tip number doesn't match a Harris-style number). Undersized tips cut too slowly and leave a rough edge; oversized tips waste gas, create excess heat-affected zone, and can warp thinner material.
What comes in a typical torch kit, and what do I need to add?
A standard kit includes the torch handle, a set of interchangeable tips, oxygen and fuel gas regulators, hoses, and a striker. You'll separately need the gas cylinders themselves (often rented or exchanged locally), safety glasses or a shade lens, and fire-resistant gloves — these aren't typically bundled in the torch kit.
What hose grade do I need for an acetylene torch setup?
Acetylene service requires Grade T hose (or Grade RM in some regions), which is rated for the gas at standard delivery pressures; Grade R hose is rated for other fuel gases like propane and MAPP but not for acetylene above very low pressures. Always check hose grade markings against the fuel gas in use before connecting.
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