Flame cutting is a destructive phenomenon that occurs in some firearms as a result of hot gases under high pressure. The most common manifestation is on the underside of a revolver top strap, where the hot, high-velocity gases released when a round is fired begin to cut through just above and in front of the cylinder.

• Flame cutting has the advantage of being very portable as no power supplies are needed. A cylinder for oxygen, a cylinder for fuel gas, hoses, a torch, and a striker are all that are required. This makes it an excellent choice for field work. Another benefit of flame cutting is that it can cut very thick metals.
• Flame cutting can cut very thick carbon steel, with a wide cutting range, and can cut 6mm-300mm thick steel plates.
• The price of the flame cutting machine is relatively low, and the initial investment cost is also low.
• Compared with plasma cutting, the cutting opening is flat and does not have a large slope.

Flame cutting uses a neutral flame to heat the material up to its kindling temperature. When this is reached, the operator presses a lever that releases an additional high-flowing stream of oxygen to the flame. This is used to sever the material and blow away the molten metal, or dross.

• The cutting requires long preheating and perforation time and the cutting speed is slow.
• The thermal deformation during cutting is large, especially when cutting (0.5-6mm) thin plates, the cutting accuracy is not high.
• Unable to cut non-ferrous metals such as copper, aluminum, and stainless steel, and few materials can be cut.
• The method of burning fuel has serious environmental pollution and is not environmentally friendly.
• The flame cutting accuracy is low, the slit is wide, and the second processing is required after flame cutting.