PROPOINT Harris M Manuale utente
User Manual
8345076V 1.0
Harris Type Welder
Style M
Please read this manual before use.
Harris Type Welder
Style M
3
For technical questions call: 1-800-665-8685
8345076 V 1.0
IMPORTANT!
• Always wear safety goggles with filter lenses.
• Before starting work, always check for leaks by brushing a thick soap solution on all connections. Open valve
and watch for bubbles to appear at points of leakage.
• Tighten loose connections with a wrench.
• Never use a flame to check for gas leaks.
• Do not use a hose that is worn, or any equipment that is in need of repair.
• Never use oxygen to blow off work or clothing.
• Purge fuel gas and oxygen passages separately before lighting.
• Secure cylinders to cart, wall or post to prevent them from falling.
• Always use reverse-flow check valves on torch and regulator. This reduces the possibility of mixing gases in the
regulator or hoses.
• Do not use oil or grease on the equipment. Oil or grease is easily ignited and is extremely volatile in the
presence of oxygen under pressure.
• Empty cylinders should be kept in specified areas and clearly marked “Empty”.
PLEASE READ THE FOLLOWING CAREFULLY
The manufacturer and/or distributor have provided the diagrams this manual as a reference tool only. Neither the
manufacturer nor distributor makes any representation or warranty of any kind to the buyer that he or she is qualified
to make any repairs to the product. In fact, the manufacturer and/or distributor expressly states that all repairs and
parts replacements should be undertaken by certified and licensed technicians. The buyer assumes all risk and liability
arising out of his or her repairs to the original product or replacement part(s), or arising out of his or her installation of
replacement parts.
FOREWORD
The equipment you have purchased was thoroughly tested and inspected when it left the factory. With reasonable
care, and by following these instructions, it will give you many years of efficient, trouble-free service. The instructions,
applications, and techniques described in this manual are designed to aid you in the basic principles of welding, flame
cutting, brazing, silver soldering, heating and the safe use of gases, regulators, and torches.
READ THIS BOOK THOROUGHLY AND FOLLOW INSTRUCTIONS!
Harris Type Welder - Style M
4For technical questions call: 1-800-665-8685
8345076V 1.0
THE PARTS OF A REGULATOR
Harris Type Welder - Style M
5
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8345076 V 1.0
CUTTING ATTACHMENT WITH PRINCIPAL PARTS
Harris Type Welder - Style M
6For technical questions call: 1-800-665-8685
8345076V 1.0
THE VARIOUS PARTS OF A WELDING TORCH HANDLE
MIXER & WELDING TIP WITH PRINCIPAL PARTS
Harris Type Welder - Style M
7
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8345076 V 1.0
OXYGEN AND ACETYLENE SET UP AND INSTRUCTIONS
ATTACHING THE REGULATORS
Open cylinder valve slightly to blow out dirt, then close. Attach regulators, tighten the
connections firmly, attach the hoses to the regulators, and tighten.
NOTE: The acetylene hose connections are left hand threads, and the oxygen
connections are right hand threads.
ATTACHING THE TORCH
Attach acetylene hose (RED) to torch valve marked “AC”, note the left hand
thread. Attach oxygen “OX”, note right hand thread. Shut both valves on torch
before opening cylinders.
OPENING THE VALVES
Be sure adjusting keys of regulators are free, that is, turned counter clockwise until
loose. Open oxygen tank valve and acetylene tank valve slowly.
ADJUSTING PRESSURE
Screw the adjusting key on each regulator until the desired working pressure for each
gas is reached. This is shown on the low pressure (left) gauge on each regulator. The
high pressure (right) gauge indicates how much pressure is in the cylinder. Proper
pressures are shown on the tip charts on page 11.
INSTALLING THE CUTTING TIP
Remove tip nut from cutting attachment. Place tip into the nut and then wind nut firmly
into place using a wrench.
TO LIGHT THE TORCH
Open the torch fuel valve approximately one half turn and ignite the acetylene. Keep
opening the torch fuel valve until the flame stops smoking excessively and leaves the
end of the tip about 1/8”, then reduce slightly to bring flame back to tip. Open the
torch oxygen valve until a bright inner cone appears on the flame. The point at which
the feathery edges of the flame disappear and a sharp inner cone is visible is called
the “Neutral Flame”.
Harris Type Welder - Style M
8For technical questions call: 1-800-665-8685
8345076V 1.0
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.
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 Size of Tips Size of Welding
Rod Oxygen Pressure Acetylene Pressure
3/64” 1 1/16” 4 PSI 4 PSI
1/16” 2 1/16” 5 PSI 5 PSI
3/32” 5 1/32” 9 PSI 7 PSI
1/8” 5 1/8” 9 PSI 7 PSI
3/16” 7 5/32” 12 PSI 9 PSI
1/4 to 3/8” 9 3/16” to 1/4” 14 PSI 10 PSI
WHITE
BLUEISH TO ORANGE
ALMOST COLOURLESS
WHITE
BLUISH TO ORANGE
ALMOST COLOURLESS
NEUTRAL
INTENSE WHITE
WHITE LIGHT ORANGE
WITH FEATHERY EDGE
CARBURIZING OXIDIZING
Harris Type Welder - Style M
9
For technical questions call: 1-800-665-8685
8345076 V 1.0
WELDING: PRACTICES AND EXERCISES
Gas welding is not a difficult art. The following exercises of torch movement are good practice, and make subsequent
welding easy.
Take a small welding tip and set proper pressures (see chart on page 8). Point the flame directly onto the steel (1/8”
stock recommended) with the flame cone just above the metal surface. When a puddle is formed, move the torch
back and forth and move the puddle across the steel. Do this slowly. It is necessary to have good penetration, and this
comes from a deep puddle. When moving the puddle, it is helpful to lean the tip about 45° away from the direction
you want the puddle to move (Figure 1).
Place two pieces of 1/8” steel together as shown in figure 2. Make the puddle again and, with a back and forth torch
motion, move the puddle along the seam. Go slowly to get good penetration. You can check this by turning the parts
over. The penetration should be visible from the bottom. Test the weld strength by attempting to tear the parts apart.
Figure 1 Figure 2
Repeat exercise 2, but add welding rod this time. While the flame is directed at the steel in order to form the puddle,
put the rod into the flame. When it gets red, maintain this temperature by moving it in and out of the flame. Once the
weld is started, dip the rod into the puddle. This builds up the weld so that the top is rounded instead of concave when
no rod was used. Remember, welding rod is necessary on all double joints and once experienced, the welder will
prefer to use rod on all welds, regardless of the thinness of the steel (Figure 3).
Material 3/16” or thicker should be beveled before welding. A 30° bevel on each piece is best. This is necessary to
obtain good penetration through the entire thickness. A rod is necessary filler metal on all welds made from beveled
edges. Once the torch movement and puddle control are mastered, the welder can make vertical, horizontal, or flat
welds (Figure 4).
Figure 3 Figure 4
Harris Type Welder - Style M
10 For technical questions call: 1-800-665-8685
8345076V 1.0
BRAZE WELDING
Braze welding differs from gas welding because the two pieces of metal are not fused together. The brazing
rod melts at a lower temperature than the parent metal, and the braze strength comes from the surface
overlay of the brazing rod.
The advantage of braze welding over gas welding is that it is the best way to join dissimilar metals, or repair cast iron.
For instance, braze welding is the correct way to fix a pump water jacket. Almost any two metals can be joined, except
aluminum and magnesium.
Braze welding is separated into two types, depending on the type of rod used. Bronze is less expensive than silver,
and should be used when the fit between the two metals must be joined is not close. The metals must be well cleaned,
then the flame is applied to them until they become a dull red color. Both pieces must be equal temperatures or the
rod will flow to the hotter piece. Heat the rod by placing it in the flame, then dip into the flux can. Notice that the heat
causes the flux to stick to the rod. If a prefluxed rod is used, this heating and dipping step may be eliminated. Once the
rod is fluxed, and the metals are brought to the proper temperature, touch the rod to the joint, put the flame onto the
rod, and melt it. The rod then melts and flows over the heated area, bonding the metal together. Sufficient flux must be
used. Without enough flux, the rod does not “stick” to the metals.
Silver brazing is a little faster than bronze brazing. This is because silver melts at a lower temperature, and less heat
is required; however, the joint must fit tightly together. Bronze bridges a gap much better than silver. Instead of putting
flux on the silver rod, the joint should be painted with flux. The way to determine when the metals are at proper
temperature is to watch the flux. When it bubbles, it is time to apply the silver. The silver melts as it is touched to the
seam and flows over the fluxed area.
Indice
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