Giving an overview of the gas or oxy acetylene welding processes. Aug 30, 2019 an oxy acetylene torch is an affordable and versatile tool used by many people to heat, weld, solder, and cut metal. Nov 18, 20 oxyacetylene welding also known as oxyacetylene welding uses an oxyfuel gas flame can be applied with or without pressure can be applied with or without the use of filler materials 5. Oxyacetylene welding also known as oxyacetylene welding uses an oxyfuel gas flame can be applied with or without pressure can be applied with or without the use of filler materials 5.
Hot gas torches are very light and easy to use in awkward positions, and are ideally suited for field repairs where the. Materials oxygen cylinder, acetylene cylinder, regulator, valves, torch, welding tips, goggles, friction lighter, tip cleaner, personal safety equipment key points and supporting information. Oxyfuel welding and oxyfuel cutting are processes that use fuel gases. Careless use of oxyfuel torches has caused many fires. The filler rod is kept ahead of the tip in the direction the weld is going and is added to the puddle. Welding goggles must be worn at all times in work areas. The oxyacetylene torch is a popular heat source in the brazing industry. Mapp gas can be used at much higher pressures than acetylene, sometimes up to 40 or 50 psi in highvolume oxyfuel cutting. Oxy acetylene welding leaving certificate engineering notes. Heating tip uses a tremendous amount of oxygen acetylene. Oxy acetylene welding andor cutting produces intense heat, and special precautions need to be taken to prevent deadly fires and explosions.
Ensure torch tips are cleaned as per manufacturers recommendations. Normally these cylinders have maroon line to indicate it. Oxyacetylene welding, commonly referred to as gas welding, is a process which relies on combustion of oxygen and acetylene. Acetylene produces more heat than other fuels, but some welders use propane. Gas welding experiment gas welding i objectives giving. Cutting of metals by means of flame has many advantages over other methods, specially when the metal is of irregular shape. May 14, 2017 gas welding uses tanks of compressed oxygen and fuelmost commonly acetylenefeeding these gases through hoses to a handheld torch, producing an extremely hot and easytocontrol flame. In handbook of plastics joining second edition, 2009. Oxyfuel welding commonly called oxyacetylene welding, oxy welding, or gas welding in the united states and oxyfuel cutting are processes that use fuel gases or liquid fuels such as gasoline and oxygen to weld or cut metals. Completed shut down and bleed the pressure from the system correctly. Oxyacetylene gas welding is commonly used to permanently join mild steel. It uses extreme heat to function, and setting it up properly is one of the most important steps in using it safely. Thirtyplus years ago, i gas welded everything because thats the setup i could afford, thats how i learned to weld.
C maintained for melt the commercial metal welding. Oxyacetylene welding is simple in concept two pieces of metal are brought together, and the touching edges are melted. However, operators must observe safety precautions. This is referred to as forehand welding, and is the most commonly used method for lighter tubing and sheet metal. The oxyacetylene torch can be used for various tasks. Safe operating procedures sop 15 oxy acetylene cutting. However, it is still widely used for a variety of applications. Safety in gas welding, cutting and similar processes page 3 of 11 preventing fire from heat, sparks, molten metal or direct contact with flame the flame from an oxyfuel gas torch often called a blowpipe is a very powerful source of ignition. The welding torch is opened, both gases are combined together and it is burned due to more oxygen mix to acetylene.
Objective identify and use the safety practices that should be observed when welding with oxyacetylene gas. Turn the adjusting screw or knob counterclockwise onehalf turn. 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. Characteristics of the oxy acetylene welding process include. If you suspect the presence of a gas, contact your supervisor to have it checked out before proceeding with any work. In most shops, acetylene gas is combined with oxygen to produce the torch flame. Fundamentals of gas cutting and welding ced engineering. Oxy acetylene or oxygen acetylene welding is a type of welding that relies on the combustion of oxygen and acetylene gases, hence often referred to as gas welding. If the torchregulators and gases are done being used for a while, follow these procedures. Welding can be performed by pointing the torch flame in the direction that the weld is progressing. Get the entire oxy acetylene welding dvd here highly recommended here are the common gas welding processes. If you have a cylinder cart, place both the oxygen and acetylene cylinders into it.
The fuel gas selection is depends on the welding material. Cylinders should not be able to be knocked or pulled over. Fasten oxygen and acetylene cylinders in an upright position. The company was formed in 2006 with the merger of harris calorific, inc.
For welding the mild steel, open oxygen torch valve and adjust to neutral flame. An introduction to gas welding oxyacetylene this is a video by the world association of technology teachers. Air acetylene welding aaw oxy hydrogen welding ohw pressure gas welding pgw the required heat for welding is generated by a flame caused by the chemical reaction between oxygen and the fuel gas acetylene. Nov, 2019 apart from oxy acetylene welding, other common variants of oxyfuel gas welding are. Other names for gas welding are oxyacetylene welding and oxy welding. The benefits of acetylene for welding and cutting are well documented. The combination of oxygen and acetylene produces a flame temperature over 6000 degrees fahrenheit making it ideal for welding and cutting. The bcga code of practice cp7 recommends the gauges are checked annually and replaced every 5 years. It can be used for cutting steel, welding steel, brazing and for heating metal. Oxy acetylene welding requires a specific skill set and thorough practice, coupled with which it can. Down of heatingweldingbrazing torch system check each step once completed. Gas cylinder is filled either by oxy acetylene gas, hydrogen gas, natural gas or other flammable gas. Gas welding procedures and techniques flight mechanic.
In oxyacetylene welding, the flame produced by the combination of the gases melts the metal faces of the workpieces to be joined, causing them to flow together. The combination of oxygen and acetylene produces a flame temperature over 6000 degrees fahrenheit making it ideal for. Pass a written test on safety and operation procedures on the oxyacetylene unit with a minimum of 100 accuracy. Safe operating procedure oxy acetylene fuel gas welder last modified by. Jan 25, 2017 oxy acetylene welding is a very common welding process that dates back to 1890s, wherein oxygen and acetylene are used as the two major welding gases. Oxygen acetylene welding, or oxy acetylene welding, is a process for joining metals that was introduced in 1903 by thomas wilson. Oxyacetylene welding also known as oxyfuel welding ofw, includes any. For brazing or bronze welding mild steel, open oxygen torch valve and adjust to a slightly oxidizing flame. Giving an overview of the gas or oxyacetylene welding processes. Excellent thermal properties make it much more effective at cutting than other fuel gases, offering productivity gains of around 33 percent relative to propane, for instance what is perhaps not so well known is the fact that acetylene because of its high flammability can present a serious safety hazard. Its popular with metal artists and also used for soldering and brazing dissimilar or nonferrous metals.
Many professionals use gas welding as the equipment is versatile. Increase fuel gas flow until flame leaves end of tip and no smoke is present. Oxy acetylene welding ofw fundamentals pressure settings. Competencies given a functional oxy fuel gas unit, instruction and demonstration of use, each student will be able to. Its a process where the a combination of pressure and flames are spread across the. Oxyfuel oxyacetylene welding a guide to gas welding. The oxy acetylene welding process uses a combination of oxygen and acetylene gas in the approved ratio to provide a high temperature flame. The flame heats the base metal to its fluid or puddle state.
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. It uses dual oxygen and acetylene gases stored under pressure in steel cylinders. Temperatures from the combustion of oxygen o2 gas and ethyne, or acetylene c2h2 gas can reach 3,340 degrees celsius, which is hot enough to cut through steel. The regulator has two gauges, a high pressure gauge for the gas in the cylinder and a low pressure gauge for the gas being fed to the torch. Oxyfuel equipment is versatile, lending itself to welding, brazing, brazewelding, silver soldering, metal heating for bending and forming and oxyfuel cutting. Oxyacetylene, gas welding rods the oxyfuel process is considered oldschool. This is a very popular way to gas weld because it produces a lot of heat as a result of acetylene and oxygen combustion, and its relatively easy to regulate. Oxyacetylene welding is a very common welding process.
It offers the advantage of a 5,500f flame temperature with the versatility of a handheld system. Developed in 1903, gas welding is used to weld pipes and tubes together while also being an effective way to repair metal. Nov 17, 2016 an introduction to gas welding oxyacetylene this is a video by the world association of technology teachers. A filler metal alloy is normally added and sometimes be used to prevent oxidation and to facilitate the metal union.
Most commonly used fuel gas is acetylene and thus the name oxyacetylene welding oaw is also used for this process, when. Pass a written test on safety and operation procedures on the oxy acetylene unit with a minimum of 100 accuracy. An introduction to gas welding oxyacetylene youtube. In this process the mixture of oxyacetylene and oxygen presented, which is flow to the burning process and controlled by control valve. Safe operating procedure oxy acetylene fuel gas welder. This is a welding process that is not used very often because the heat is not as high as the other processes, but is commonly used for welding lead. Mostly oxy acetylene gas is used for all general purpose of welding.
Hot gas welding can be used to weld practically any shape or size of component, and the equipment has probably the lowest cost of all the plastic welding techniques. With this family of processes, the base metal and a filler rod are melted using a. Oxyacetylene welding requires a specific skill set and thorough practice, coupled with which it can. One of the most commonly used applications of acetylene gas is oxy acetylene welding, oxy welding, or gas welding. Competencies given a functional oxyfuel gas unit, instruction and demonstration of use, each student will be able to. Oxyacetylene welding andor cutting produces intense heat, and special precautions need to be taken to prevent deadly fires and explosions. The use of oxygen and acetylene as welding gases dates back to the 1890s. The oxy acetylene and other oxy fuel gas mixtures welding torch remains a mainstay heat source for manual brazing and braze welding, as well as metal forming, preparation, and localized heat treating. Oxyacetylene welding acetylene gas plants manufacturer.
A mixture of oxygen and acetylene, burns as an intense focussed flame, at approximately 3,500 degrees centigrade. When the flame comes in contact with steel, it melts the surface forming a molten pool, allowing welding to take place. In addition to the purposes of welding connecting, gas welding can also be used as preheating, brazing, cutting, and hard facing. Oxyfuel oxyacetylene welding a guide to gas welding twi. Pressure and rod filler metal is used as needed depending on the project. When mixed together in correct proportions within a handheld torch or blowpipe, a relatively hot flame is. In oxyacetylene gas welding, a blend of oxygen and acetylene combusts and produces fire at a temperature of around 3500c. In modern steelage the steelmakers cut iron and steel by oxyacetylene, oxyhydrogen, oxy propane, oxynatural gas cutting blowpipes easily, speedily, and cleanly. Close acetylene torch valve first, then close oxygen torch valve. The oxy acetylene welding process combines oxygen and.
Do not use this equipment unless you have been instructed. The oxyacetylene torch is a safe tool if used properly. Gas welding and cutting oxyfuel welding, commonly referred to as oxy welding or gas welding is a process of joining metals by application of heat created by gas flame. Oxyacetylene welding is a very common welding process that dates back to 1890s, wherein oxygen and acetylene are used as the two major welding gases. Apr 16, 2017 gas cylinder is filled either by oxy acetylene gas, hydrogen gas, natural gas or other flammable gas. Oxyacetylene gas welding is the most widely recognized sort of gaswelding process. Temperatures from the combustion of oxygen o2 gas and ethyne, or acetylene c2h2 gas can reach 3,340 degrees celsius, which is. The gas flow rate is controlled by a pressure adjusting screw which sets the outlet gas pressure. Oxyfuel welding, heating and cutting concoa gas pressure.
Gas welding experiment gas welding i objectives giving an. Heating tip uses a tremendous amount of oxygenacetylene. Oxy acetylene welding ofw fundamentals pressure settings chart set up and kit. Mig also is referred to as gmaw gas metal arc welding. Gas welding uses tanks of compressed oxygen and fuelmost commonly acetylenefeeding these gases through hoses to a handheld torch, producing an extremely hot and easytocontrol flame. Most commonly used fuel gas is acetylene and thus the name oxyacetylene welding oaw is also used for this process, when acetylene is used as a fuel gas. The term oxyfuel is used to denote a combination of oxygen and a fuel gas, means its a process in which oxygen and a fuel combustible gas both are required. Oxyfuel welding ofw is also known as gas welding or oxyfuel gas welding. However, if it is used incorrectly, serious injury can occur to you and the equipment. In addition, oxy fuel cutting is still widely used, both in heavy industry and light industrial and repair operations.
Oxyacetylene welding process advantage fabricated metals. The harris products group is a world leader in metal working products used in the brazing, soldering, welding, cutting and gas distribution industries. Safety in gas welding, cutting and similar processes. Ensure both gas bottles are off and the welder secured with bottles stored upright at completion of work. Do not use this equipment unless a teacher has instructed you in its safe use and operation and has given permission. Im a welding instructorselfemployed welder and i have a student that signed up for a night course to learn oxyacetylene welding. Oxyacetylene welding it is the common method of gas welding. If not, they should be securely fastened with a chain to a workbench, a wall, or a post. Once the gas welding equipment is connected as per the setup shown in fig.
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