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GAS WELDING PROCEDURES
Gas welding is a method of joining similar metals by heating the adjacent surfaces to the melting point with an oxy-
acetylene flame, and allowing the two parts to fuse together, with a filler metal being required on materials 3/16"
thick or more. The resulting weld is as strong as the parent metal.
All metal should be cleaned before welding. Oil, grease, rust, scale, or other impurities affect the weld quality, or
tensile strength. Metal 3/16" or more thick should be beveled before welding, and when beveled sides are joined, a
filler rod of the same material is necessary.
The welding tip chart on this page shows the proper tip sizes and oxygen and acetylene pressures related to the size
material to be welded. The chart should serve as a handy guide to be referred to often. If too large a tip is used, it will
produce a soft flame, the tip will heat up unnecessarily and it will be often accompanied by a popping noise, which
splatters the weld puddle. Too hot a flame burns the steel, and too small a flame is not big enough to get the job done.
A neutral flame is used for almost all gas welding. The oxy-acetylene flame consumes all oxygen in the air around the
welding area, which leaves an uncontaminated weld area and a weld of maximum strength, An oxidizing flame is
rarely used, and a carburizing flame is occasionally useful when flame hardening or brazing.
NEUTRAL
BLUISH TO ORANGE
ALMOST COLOURLESS
WHITE
WELDING ROD
Available for all types of welding, including mild steel, cast iron, and aluminum, in the following sizes: 1/16", 3/32",
1/8", 5/32", 3/16", 1/4". The size needed will be determined by the type of weld, the thickness of the metal, and
the amount of filler metal required.
Thickness of metal
3/64"
1/16"
3/32"
1/8"
3/16"
1/4 to 3/8"
8
All manuals and user guides at all-guides.com
Harris Type Welder - Style M
CARBURIZING
WHITE
INTENSE WHITE
WITH FEATHERY EDGE
Size of Welding
Size of Tips
1
2
5
5
7
9
3/16" to 1/4"
LIGHT ORANGE
Oxygen Pressure
Rod
1/16"
4 PSI
1/16"
5 PSI
1/32"
9 PSI
1/8"
9 PSI
5/32"
12 PSI
14 PSI
For technical questions call: 1-800-665-8685
8345076
OXIDIZING
ALMOST COLOURLESS
BLUEISH TO ORANGE
WHITE
Acetylene Pressure
4 PSI
5 PSI
7 PSI
7 PSI
9 PSI
10 PSI
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