pro.point Harris M, User Manual

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Harris Type Welder - Style M
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For technical questions call: 1-800-665-8685
8345076 V 1.0
FLAME CUTTING
Flame cutting is a simple process that can be quickly mastered. Only steel can be cut with the oxy-acetylene method
since cast iron, stainless steel, aluminum, brass, and other ferrous metals do not burn the way steel does.
The way to cut steel is to heat it until is softens (often accompanied by a red color), and then burn it rapidly with pure
oxygen. A cutting torch provides both the preheat flames and pure oxygen cutting stream. Acetylene and oxygen are
combined in the torch head, and burn at the torch tip with a 6,000°F flame; these are the preheat flames. The center
hole in the cutting tip is the cutting oxygen hole, through which pure oxygen, which is not mixed with acetylene, flows
to cut the steel after the metal is sufficiently preheated.
CUTTING TIPS
Cutting tips are available in a wide range of sizes, the proper size being determined by the steel thickness. Refer to the
chart below for correct pressures and tip sizes.
Thickness of Metal Size of Tip Oxygen Pressure* Acetylene Pressure*
1/8” to 1/4” 00 25 to 35 PSI 6 PSI
3/8” 0 25 to 35 PSI 6 PSI
1/2” to 1” 1 35 to 45 PSI 6 PSI
2” 2 45 to 50 PSI 6 PSI
3” to 4” 3 45 to 55 PSI 6 PSI
5” to 6” 4 55 to 65 PSI 6 PSI
*Tip size and pressure may vary according to operator choice. This chart should serve as a guide or reference.