• Oxy Acetylene Welding Equipment Read more >>
  • Welding or Cutting Hoses a. Do not allow hoses to come in contact with oil or grease. These will penetrate and deteriorate the rubber and constitute a hazard with oxygen. b. Always protect hoses from being walked on or run over. Avoid kinks and tangles. Do not leave hoses where anyone can trip over... Read more >>
  • Oxygen and Oxygen Production Oxygen and Oxygen Production a. * Oxygen* is a colorless, tasteless, odorless gas that is slightly heavier than air. It is nonflammable but will support combustion with other elements. In its free state, oxygen is one of the most common elements. The atmosphere is made up of approximately 21 parts of... Read more >>
  • OxyFuel Welding Forehand OxyFuel Welding Forehand In the OxyFuel Welding forehand method, the welding rod precedes the torch. The torch is held at approximately a 45 degree angle from the vertical in the direction of welding, as shown in figure 11-4. The flame is pointed in the direction of welding and directed between... Read more >>
  • Oxyfuel Welding Rods Oxyfuel Welding Rods The oxyfuel welding rod, which is melted into the welded joint, plays an important part in the quality of the finished weld. Good oxyfuel welding rods are designed to permit free flowing metal which will unite readily with the base metal to produce sound, clean welds of... Read more >>
  • Welding Oxyfuel Working Pressure The required working pressure increases as the tip orifice increases. The relation between the tip number and the diameter of the orifice may vary with different manufacturers. However, the smaller number always indicates the smaller diameter. For the approximate relation between the tip number and the required oxygen and acetylene... Read more >>
  • Oxyacetylene Regulators Malfunctions and Corrections Oxyacetylene Regulators Malfunctions and Corrections Leakage of gas between the regulator seat and the nozzle is the principal problem encounter with regulators. It is indicated by a gradual increase in pressure on the working pressure gauge when the adjusting screw is fully released or is in position after adjustment. This... Read more >>
  • Fuel Gas Cylinders Although the most familiar fuel gas used for cutting and welding is acetylene, propane, natural gas, and propylene are also used. Store these* fuel gas cylinders* in a specified, well-ventilated area or outdoors, and in a vertical condition. Any cylinders should have their caps on, and fuel gas cylinders, either... Read more >>
  • OxyFuel Welding Steel OxyFuel Welding Steel The term “steel” may be applied to many ferrous metals which differ greatly in both chemical and physical properties. In general, they may be divided into plain carbon and alloy groups. By following the proper procedures, most steels can be successfully welded. However, parts fabricated by welding... Read more >>
  • Oxy-Acetylene Welding of Steel & Iron Oxy-Acetylene Welding of Steel & Iron There are many different varieties of steel, but from a welding standpoint they may be classified by their carbon content. Those having a high carbon content are called hard steels; those with a low carbon content, soft steels. Wrought iron may be treated the... Read more >>
  • Oxy-Acetylene Cutting Oxy-Acetylene Cutting Oxy-acetylene torches have an attachment for cutting, which can be attached to the welding torch. Here the flow of oxygen is controlled a lever. In planning the job, have the tanks firmly secured to prevent tipping over, the hose should be BEHIND you so as to protect it... Read more >>
  • Oxy-Acetylene Welding of Aluminum Oxy-Acetylene Welding of Aluminum While aluminum has a melting point less than half that of steel, its conductivity is over three times as great, so we use a tip about the same size for this metal as we do for steel, and because of this conductivity, we should realize that... Read more >>
  • Oxyfuel Welding Fluxes OxyFuel Welding fluxes are used to protect the metal in the joint area from this oxidation and thus let the molten filler metal flow onto clean metal surfaces. Oxyfuel welding fluxes are available as powder, past or rod coating. Flux powder is sprinkled over the slightly preheated joint area. The filler... Read more >>
  • Oxy-Acetylene Welding of Copper, Brass & Bronze  Oxy-Acetylene Welding of Copper, Brass & Bronze Copper conducts heat more rapidly than any other commercial metal. It will oxidize very easily and this oxidation is not easily apparent to the operator, but the weld becomes very brittle. The melting point is under that of steel and iron, yet because... Read more >>
  • Oxy-Acetylene Welding of Cast Iron Oxy-Acetylene Welding of Cast Iron Oxy-acetylene welding of cast iron is comparatively easy, if attention is paid to some simple rules. The cast iron in common use is known as “gray;” it is quite soft, easily machined and has a lower melting point than wrought iron or steel. It contains... Read more >>
  • Gas Welding Aluminum Gas Welding Aluminum. Aluminum is readily joined by welding, brazing, and soldering. In many instances, aluminum is joined with the conventional equipment and techniques used with other metals. However, specialized equipment or techniques may sometimes be required. The alloy, joint configuration, strength required, appearance, and cost are factors dictating the choice... Read more >>
  • OxyFuel Welding Sheet Metal  Welding Sheet Metal. For welding purposes, the term “sheet metal” is restricted to thicknesses of metals up to and including 1/8 in. (3.2 mm). Welds in sheet metal up to 1/16 in. (1.6 mm) thick can be made satisfactorily by flanging the edges at the joint. The flanges must be... Read more >>
  • OxyFuel Welding : Overhead Position a. General. Overhead welding is performed from the underside of a joint. b. Bead welds. In overhead welding, the metal deposited tends to drop or sag on the plate, causing the bead to have a high crown. To overcome this difficulty, the molten puddle should be kept small, and enough... Read more >>
  • OxyFuel Horizontal Welding a. Welding cannot always be done in the most desirable position. It must be done in the position in which the part will be used. Often that may be on the ceiling, in the corner, or on the floor. Proper description and definition is necessary since welding procedures must indicate... Read more >>
  • Oxyfuel Gas Welding (OFW) Procedures  Oxyfuel gas welding (OFW) is a group of welding processes which join metals by heating with a fuel gas flame with or without the application of pressure and with or without the use of filler metal. OFW includes any welding operation that makes use of a fuel gas combined with... Read more >>
  • OxyFuel Flat Position Welding OxyFuel flat position welding is performed from the upper side of the joint. The face of the weld is approximately horizontal. Bead Welds. In order to make satisfactory bead welds on a plate surface, the flare motion, tip angle, and position of the welding flame above the molten puddle should be... Read more >>
  • OxyFuel Fillet Welding OxyFuel Fillet Welding The fillet weld is the most popular of all types of welds because there is normally no preparation required. In some cases, the fillet weld is the least expensive, even though it might require more filler metal than a groove weld since the preparation cost would be... Read more >>
  • OxyFuel Cutting with MAPP Gas Cutting with MAPP gas. (1) Quality cuts with MAPP gas require a proper balance between preheat flame adjustment, oxygen pressure, coupling distance, torch angle, travel speed, plate quality, and tip size. Oxyfuel ratios to control flame condition are given in table 11-4. (2) MAPP gas is similar to acetylene and... Read more >>
  • OxyFuel Cutting Steel and Cast Iron Cutting Steel and Cast Iron. (1) General. Plain carbon steels with a carbon content not exceeding 0.25 percent can be cut without special precautions other than those required to obtain cuts of good quality. Certain steel alloys develop high resistance to the action of the cutting oxygen, making it difficult... Read more >>
  • OxyFuel Cutting Overview General. (1) If iron or steel is heated to its kindling temperature (not less than 1600°F (871°C)), and is then brought into contact with oxygen, it burns or oxidizes very rapidly. The reaction of oxygen with the iron or steel forms iron oxide (Fe3O4) and gives off considerable heat. This... Read more >>
  • OxyFuel Backhand Welding In the OxyFuel backhand welding method, the torch precedes the welding rod, as shown in figure 11-5. The torch is held at approximately a 45 degree angle from the vertical away from the direction of welding, with the flame directed at the molten puddle. The welding rod is between the... Read more >>
  • Aluminum Brazing Aluminum Brazing a. Aluminum Brazing. Many **aluminum alloys **can be brazed. Aluminum brazing alloys are used to provide an all-aluminum structure with excellent corrosion resistance and good strength and appearance. The melting point of the brazing filler metal is relatively close to that of the material being joined. However, the... Read more >>
  • Oxy-Fuel Welding : Vertical Position Oxy-fuel welding in the vertical position requires a technique in order to keep the molten metal from running downward. In vertical position welding, the axis of the weld is approximately vertical. When welding is done on a vertical surface, the molten metal has a tendency to run downward and pile up. A... Read more >>
  • Setting up Oxyacetylene Welding Equipment WARNING Always have suitable fire extinguishing equipment at hand when doing any welding. When setting up setting up oxyacetylene welding equipment, it is important that all operations be performed systematically in order to avoid mistakes and possible trouble. The setting up procedures given in a through d below will assure... Read more >>
  • Oxygen Cylinders A typical oxygen cylinder is shown in figure 5-7. It is made of steel and has a capacity of 220 cu ft at a pressure of 2000 psi (13,790 kPa) and a temperature of 70°F (21°C). Attached equipment provided by the oxygen supplier consists of an outlet valve, a removable... Read more >>
  • Oxygen and Acetylene Regulators  The gases compressed in oxygen and acetylene cylinders are held at pressures too high for oxyacetylene welding.* Oxygen and acetylene regulators* reduce pressure and control the flow of gases from the cylinders. The pressure in an oxygen cylinder can be as high as 2200 psi (15,169 kPa), which must be... Read more >>
  • Oxyacetylene Welding Torch The oxyacetylene welding torch is used to mix oxygen and acetylene in definite proportions. It also controls the volume of these gases burning at the welding tip, which produces the required type of flame. The torch consists of a handle or body which contains the hose connections for the oxygen... Read more >>
  • Oxyacetylene Welding Torch Malfunctions and Corrections WARNING Defects in oxyacetylene welding torches which are sources of gas leaks must be corrected immediately, as they may result in flashbacks or backfires, with resultant injury to the operator and/ or damage to the welding apparatus. General. Improved functioning of welding torches is usually due to one or more... Read more >>
  • Oxyacetylene Welding Torch and Cutting Equipment Oxyacetylene Welding Torch and Cutting Equipment The Oxyacetylene cutting torch (fig. 5-12), like the welding torch, has a tube for oxygen and one for acetylene. In addition, there is a tube for high pressure oxygen, along with a cutting tip or nozzle. The tip (fig. 5-13) is provided with a... Read more >>
  • Gas Welding Gas welding processes are a group of welding processes in which a weld is made by heating with a gas flame or flares. Pressure and/or filler metal may or may not be used. Also referred to as oxyfuel gas welding, the term gas welding is used to describe any welding... Read more >>
  • Stationary Oxyacetylene Welding Equipment Stationary oxyacetylene welding equipment is installed where welding operations are conducted in a fixed location. Oxygen and acetylene are provided in the welding area as outlined below. Oxygen. Oxygen is obtained from a number of cylinders manifolded and equipped with a master regulator. The regulator and manifold control the pressure... Read more >>
  • Portable Oxyacetylene Welding Equipment Portable Oxyacetylene Welding Equipment The portable oxyacetylene welding equipment outfit consists of an oxygen cylinder and an acetylene cylinder with attached valves, regulators, gauges, hoses, a welding torch, a selection of welding tips, a striker or spark lighter(fig. 5-5), a good pair of welding gloves,  a pair of shade 5... Read more >>
  • Acetylene Generator Acetylene Generator NOTE Acetylene generator equipment is not a standard included in this manual for information only. a. Acetylene is a fuel gas composed of carbon and hydrogen (C2H2), generated by the action of calcium carbide, a gray stonelike substance, and water in a generating unit. Acetylene is colorless, but... Read more >>
  • Acetylene Cylinders : Welding Equipment Acetylene cylinders are part of many welding and cutting operations. For welding purposes, acetylene is contained in three common cylinders with capacities of 1, 60, 100, and 300 cu ft. Acetylene must not be drawn off in volumes greater than 1/7 of the cylinder’s rated capacity. In order to decrease... Read more >>
  • Oxygen Cylinders Oxygen cylinders are used in many welding operations. Below are some basic safety procedures that should be followed. When dealing with compressed gases, Always refer to oxygen by its full name and not by the word “air” alone Oxygen should never be used for “air” in any way. WARNING Oil... Read more >>
  • Oxyfuel Welding Safety Precautions The following oxyfuel welding safety precautions should be observed: Do not experiment with torches or regulators in any way. Do not use oxygen regulators with acetylene cylinders. Do not use any lubricants on regulators or tanks. Always use the proper tip or nozzle, and always operate it at the proper... Read more >>
  • Acetylene Cylinders : Safety CAUTION: If acetylene cylinders have been stored or transported horizontally (on their sides), stand cylinders vertically (upright) for 45 minutes prior to (before) use. a. Always refer to acetylene by its full name and not by the word “gas” alone. Acetylene is very different from city or furnace gas. Acetylene... Read more >>