This video is on oxy acetylene welding process which contains oxygen and acetylene gas which mix together to gives a continuous flame through a nozzle and to. If you light up the tip and the flame is away from the tip, decrease the acetylene pressure and let the flame come back against the tip. Fundamentals of gas cutting and welding ced engineering. Portable tote oxyacetylene cutting and welding outfit 770500. Oxy fuel welding commonly called oxyacetylene welding, oxy welding, or gas welding in the united states and oxy fuel cutting are processes that use fuel gases or liquid fuels such as gasoline and oxygen to weld or cut metals. Gas welding utilizes the heat produced by a gas flame to melt the filler metal, if used, and the base metal, thereby creating a weld. Acetylene is the hottest fuel gas when combined with oxygen. To avoid this, the rate of withdrawal of gas should be restricted to the values given in the british compressed gases association bcga code of practice the design and construction of manifolds using acetylene gas from 1. Oxy fuel cutting can be used to cut thicknesses from 28.
Light the acetylene before opening the oxygen on the torch. Why does the flame appear to have a bright blue inner cone and a lighter blue outer feather of a flame. Oxy propane propane is the easiest fuel gas alternative to acetylene to obtain and is normally supplied in cylinders on a deposit basis, rather than rented as is. Apr 16, 2017 gas welding is a type of liquid state welding process in which fuel gases burns to generate heat. Oxy acetylene welding torch oxygen and the fuel gas having been reduced in pressure by the gas regulators are fed through suitable hoses to a welding torch which mixes and controls the flow of gases to the welding nozzle or tip where the gas mixture is burnt to produce a flame for carrying out gas welding operation. Oxyacetylene welding, commonly referred to as gas welding, is a process which relies on combustion of oxygen and acetylene. This process can be done with or without the help of filler material. Others want to carry documents around with them on their mobile phones and read while they are on the move. In this process, mostly oxy acetylene gas is used as fuel gas. Feb 10, 2021 oxy acetylene welding uses a highheat, hightemperature flame that is produced by burning a fuel gas most commonly acetylene mixed with pure oxygen.
Store compressed gas and oxygen cylinders in separate locado not use acetylene above 15 psi 103 kpa flowing. The welding helmet fits on the head using a plastic adjustable headband. Types of welding fuel gases the fuel gases used for welding include acetylene, propane and methylacetylene propadiene. Pure oxygen, instead of air, is used to increase the. Gap wirea wire used for correct spacing of butt joints. The helmet leaves both hands free for working and positioning materials. Gas welding is one of the oldest and most versatile welding processes, but in recent years it has become less popular in industrial applications. Oxy fuel welding and oxy fuel cutting are processes that use fuel gases and oxygen to weld or cut metals. The oxygen pressure ranges between 10 to 40 pounds, depending on the size of the torch tip. Gas hoses to be checked for any damage before starting welding do not use if any suspicious damage is evident ensure flint lighter is ready to use before turning on gas turn on acetylene gas first and light it before turning oxygen on refer to operating instructions gas hoses to be well clear of weld splatter at all times. Thin to medium sheet metals are easily weld using oxyacetylene welding. Oxy acetylene welding ofw fundamentals pressure settings. This booklet provides safety and health information on oxyfuel gas welding, cutting, heating.
In modern steelage the steelmakers cut iron and steel by oxy acetylene, oxy hydrogen, oxy propane, oxy natural gas cutting blowpipes easily, speedily, and cleanly. Safe operating procedures sop 15 oxy acetylene cutting. Shielded metal arc welding stick welding, manual metal arc welding uses a metallic. Keep torch flame or sparks away from cylinder, regulator, and gas hose. At the end of the articles you will find the download pdf button that you can easily download pdf. Do not smoke or allow anyone else to smoke near the oxy fuel gas welder. The flame temperature when burning acetylene in oxygen is 3100 degree c. Oxyacetylene, torch flame, brazing schoolworkhelper. Video for my high school students to follow as they learn the process of using the oxy acetylene torch oxy acetylene welding 10.
Check oxy fuel system for leaks with an approved leak detection solution or leak detector. Introduction to oxyacetylene welding, unit 3 manual metal arc welding, unit 4. Many people prefer to read offline or to print out text and read from the real printed page. Ceramic bricks, vise grips, pliers, and clamps are available in a file cabinet in the. A common propaneair flame burns at about 2,250 k, a propaneoxygen flame burns at about 2,526 k, an oxyhydrogen flame burns at. Dirty seating surfaces, leaks from loose tips, and failure to purge the equipment can also cause backfire and flashback. It is produced by combining hydrogen atoms and carbon atoms. Oxy acetylene welding the process of oxy acetylene welding can be used for almost all metals and alloys for engineering purposes. Gas cutting and welding kits from boc are a complete and convenient solution to get you started on your welding and cutting applications. Oxyfuel oxyacetylene welding a guide to gas welding.
Acetylene is a colourless hydrocarbon gas with a strong odour. Do not use or compress acetylene in a free state at pressures more than 15 psig. One of the most common applications of oxyacetylene welding is for repair works. Purge the oxygen gas line and check for constant gas flow.
Oxygen is an accelerante, it causes every thing it. When mixed together in correct proportions within a handheld torch or blowpipe, a hot flame is produced with a temperature of about 3,200c. In such cases appropriate alterations to the term and the definition are necessary. Unit ii oxygas and other cutting welding processes. Unit ii oxy gas and other cuttingwelding processes student handout section i.
Fusion welding a welding process that joins metals by heating them to be a melting point and allowing them to fuse or flow together. Acetylene one piece high gas withdrawal rates will require cylinder manifolding. When mixed together in correct proportions within a handheld torch or blowpipe, a relatively hot flame is produced with a temperature of about 3,200 deg. Oxygen acetylene welding, or gas welding, is a process which relies on combustion of oxygen and acetylene. Welding tip sizes should be selected according to the thickness of the metal to be. The atoms are bound tightly together to form a molecule of acetylene. Preparation of the edges will be done by flame cutting, shearing, flame grooving, machining, chipping, or grinding. Oxy acetylene cutting safety in agriculture osha standard 1910. However, it is still widely used for a variety of applications. As a welding torch, the basic operation of an oxyacetylene unit is blending two gases. The cylinder can be opened or closed by a wheel which operates a valve. Machine cutting equipment gce group global gas control. Setup open the acetylene valve on the blowpipe about oneeighth of a turn. The chemical action of the oxy acetylene flame can be adjusted.
Boc masterstart weld is a quality flame welding gas kit for general purpose oxy acetylene welding. Oxy fuel equipment is versatile, lending itself to welding, brazing, braze welding, silver soldering, metal heating for bending and forming and oxy. Oxy acetylene oa welding is one of the many types of welding supported by the prl. The cylinders are filled with oxygen at about 150 kgcm2 at 21c. Safety in gas welding, cutting and similar processes hse. Mar 11, 2019 oxy acetylene welding is a welding process manually, in which the surfaces to be joined, which is warming to melt by a gas flame oxyacetylene with or without filler metal, where the connection process without emphasis. Cutting and welding gas control equipment gce group. Oxyacetylene welding school of the art institute of chicago. The welding helmet is designed specifically for the purpose of arc welding.
An insufficient volume of oxygen or acetylene or incorrect gas pressures can also cause backfire and flashback. Many combinations of gases are used in gas welding. In this welding process, mostly oxy acetylene gas is used as a working fuel gas. Oxyfuel oxyacetylene welding a guide to gas welding twi. Working principle gas welding is a fusion welding process in which welding is done by heating workpiece with flames obtained from oxy fuel gases. The welding outfit usually consists of a cylinder of acetylene or mapp gas, a cylinder of oxygen, two regulators, two lengths of hose with fittings, and a welding torch with tips fig. Turn the acetylene knob on the cutting torch about a quarter of a turn and light the acetylene. Mediumduty oxyacetylene cutting and welding outfit 770 502. Equipments used for oxyacetylene welding metallurgy. Pdf oxyfuel welding and cutting sewalem gezie academia. Download oxyacetylene welding and cutting pdf file size. In these process, a mixture in proper proportion of such as acetylene, liquefied petroleum, methyl acetylene propadene, natural gas and hydrogen with oxygen are burnt to get flame.
Applying fuel gas welding fgw processes and techniques. Oxyacetylene cutting safety occupational safety and. A filler metal is sometimes added, which is available as rod or wire with or without flux. Different parts of high pressure welding torch are shown in fig. Gas welding and steel flame cutting basic gas welding procedures gas welding. The fuel gas commonly acetylene, when mixed with proper proportion of oxygen in a mixing chamber of welding torch, produces a very hot flame of about 57005800f. This combined with a neutral welding atmosphere and suitable filler material allows a skilled operator to weld most metals. This leaflet is for people who use compressed gases for welding, hot cutting and. Generally, hc gases are used as fuel gas in oxy fuel gas cutting. The instructor will give you a series of welding and cutting procedures to perform. Commonlyused fuel gases include acetylene, propylene, propane and natural gas. Oxyfuel gas equipment has many uses welding, cutting, heating, straightening. Basic gas welding and cutting department of training and.
The oxy acetylene flame is made by mixing oxygen and acetylene gases in a. Oxy fuel welding and cutting oxyacetylene redirects here. It is acceptable to use acetylene regulators that indicate a static pressure up to 22 psi 151 kpa. Oxygen acetylene welding, or gas welding, is a process which relies on. Oxy fuel welding, commonly referred to as oxy welding or gas welding is a process of joining metals by application of heat created by gas flame. Purge your acetylene and oxygen passages individually before lighting the torch. Pdf oxyacetylene welding krishna chaitanya academia. Pure oxygen, instead of air, is used to increase the flame temperature to allow localized melting of the workpiece material in a room environment. 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 316 thick or more.
This heat is used to melt interface surfaces of welding plates which are held together to form a joint. Osha safety and health standards, 29 cfr 1910, available from u. Both oxygen and acetylene drawn from the cylinders and mixed in mixing chamber at equal and high pressure i. Oxy acetylene welding is used in joining various aircraft parts. Inspection of portable and oxy fuel gas systems central. Do not withdraw acetylene from a cylinder at a rate exceeding 17 of the cylinder capacity per hour. May, 2020 for oxy gas welding on the plate more than 14 of an inch thick, bevel the edges at an angle of 30 degrees to 45 degrees, making the groove included angle from 60 degrees to 90 degrees. Gces main business was originally concentrated in the oxy acetylene cutting and welding market. The fuel gas pressure is 1 psi pound per square inch or less.
In the right applications, this makes acetylene ideal for welding different steel materials. The lowpressure torch is also known as an injector torch. For the song, see welding, oxy welding, or gas welding in the u. An oxygas welding outfit also is called a welding rig. The equipment used in oxyacetylene welding is low in cost, usually portable, and versatile enough to be used for a variety of related operations such as bending and straightening, preheating, postheating, surfacing, brazing, and braze welding. Describe the three types of flames and their effects on the metal to be welded. Setup and shutdown procedure for oxy fuel cutting torch. But the most common of these is oxygen and acetylene. Open the acetylene blowpipe handpiece valve very slightly and light with a flint lighter only.
Oxyfuel welding, heating and cutting concoa gas pressure. Use only acetylene or propane gas and oxygen with this equipment. The base material is melted with the filler rod using a flame from the combination of oxy fuel gas through the tip of the welding torch. Unfortunately, oxy acetylene is still the best all purpose gas combo, but there are viable alternatives, as long as you know what you want to be able to do and you choose carefully. This welding on the web box will appear throughout the manual. Share copy and redistribute the material in any medium or format. Gce group as an independent entity was formed in 1987 through the merging of gas equipment activities by two of the worlds leading industrial gas and welding.
This flame can be used to melt metal and flame is directed by welding torch. Cutting, weldingbrazing and heating tip flow and pressure data. Oxygen and acetylene together in a flame provide the heat necessary to melt most metals. Oxy fuel equipment is versatile, lending itself to welding, brazing, braze welding, silver soldering, metal heating for bending and forming and oxy fuel cutting. Fundamentals of gas cutting and welding cedengineering.
In this technique, the torch is held in the right hand and the filler rod is. Manual metal arc welding, department of training and. This heat is further used to melt interface surfaces of welding plates which are held together to form a joint. When you are done clean the cutting tip with the cleaning tool file and tip cleaner.
Cutting of metals by means of flame has many advantages over other methods, specially when the metal is of irregular shape. This process can be done with or without help of filler material. The oxyacetylene welding process uses a combination of oxygen and. Oxy acetylene flame may also be used for all types of. Then purge the acetylene gas line and check for constant gas flow. Oxygenacetylene welding, or gas welding, is a process which relies on. However, with almost 100 years of experience in the handling of high pressure gases, the. There are two valves provided on the torch to control the flow rate of both the gases. Oaw is a manual process in which the welder must personally control the the torch.
Safety in gas welding, cutting and similar processes free safety. Gas welding equipment details of gas welding equipment are as under. Acetylene gas can also condense and drip off the torch, causing a fire risk. Follow the manufacturers recommendations for the correct operating pressures for the metal being welded and for the tip size being used. Oxy acetylene is wellknown for its flexibility, and is suited for various machining operations other welding, such as brazing, cutting, etc.
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