Oxy fuel cutting is an excellent solution for construction sites and field repair work because of its low cost and diverse application on metal of varying degrees of thickness. Gas flame the molten metal must be protected from the atmosphere absorption of. Oxygen is supplied in ratio to the fuel gas, and is then lit by a sparking lighter. Welding and brazing guide gases and welding equipment. Nov 30, 2015 how to master the fiery art of gas welding. Ofw includes any welding operation that makes use of a fuel gas combined with oxygen as a heating medium. The oxy fuel cutting process is capable of cutting steel whose composition is less than. The term oxy fuel 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 commonly called oxyacetylene welding, oxy welding, or gas welding in the u. Oxy fuel weldingfor almost anyone interested in trying his hand at welding, deciding on which process to start with can be a challenge. To provide safety guidance in the use in performing oxyacetylene welding. Weldingoverview of techniques wikibooks, open books for an. Oxy fuel welding ofw is also known as gas welding or oxy fuel gas welding. There is no need for filler material or pressure to create the weld. It protects the user and equipment from damage or explosions. Which of the following is not a general safety practice you should follow. Learn welding oxyfuel with free interactive flashcards. This guide contains important information related to the safe and efficient operation of oxy fuel welding, cutting, and heating apparatus. Welded metal occurs when two pieces are heated to a temperature that produces a shared pool of molten metal.
An oxy acetylene torch with a welding tip concentrates the heat in a comparatively small area, while an oxy acetylene torch with a multiflame heating tip rosebud applies heat to a larger area. In most shops, acetylene gas is combined with oxygen to produce the torch flame. This course is designed to familiarize participants with the basic parts and safe operation of oxy fuel gas welding rigs. French engineers edmond fouche and charles picard became the first to develop oxygenacetylene welding in 1903. Acetylene produces more heat than other fuels, but some welders use propane. In fusion welding, a heat source melts the metal to form a bridge between the components. 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. The gas is generally a mixture of a fuel gas and oxygen to create a clean, hot flame. Welding and fuel gases what is welding and fuel gasses. See safe welding and cutting with oxy fuel video arc welding processes. However, it is still widely used for a variety of applications.
Gas welding is a type of liquid state welding process in which fuel gases burns to generate heat. Flame temperatures can reach 3,200 degrees celsius. Other welding techniques that are effective for aluminum include tig tungsten inert gas welding and mig metal inert gas welding. The lowpressure torch is also known as an injector torch. 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. Oxyfuel welding ofw is a group of welding processes that join metals by heating them with a fuel gas flame or flares with or without the application of pressure and with or without the use of filler metal. Persons can strike an object, or be struck by a moving or flyingfalling. Choose from rg45 welding rod and flux coated bronze brazing rod.
Welding oxyfuel welding a process using fuel gases and oxygen to weld metals. Welding, whether arc welding or oxy fuel, carries with it the potential for serious accidents. This is a good book to learn oxyfuel gas welding, this is a paperback version of the book. Competencies given a functional oxy fuel gas unit, instruction and demonstration of use, each student will be able to. Gas welding involves the use of a gasfed flame torch to heat the metal work piece and the filler material to create a weld. Safety for oxyacetylene welding printed copies of this document are uncontrolled. Acetylene is the primary fuel for oxy fuel welding and is the fuel of choice for repair work and general cutting and welding, acetylene produces the hottest and most concentrated primary flame of all industrial fuel gases. Generally, the principal for oxy fuel welding or cutting is the same. Oxy fuel cutting is a chemical reaction between pure oxygen and steel to form iron oxide. Preheat flames are used to raise the surface or edge of.
A filler rod is usually blended into the weld for strength. The companys sales continued to grow for many years. Supersedes and is equivalent to mem05004c perform routine oxy acetylene welding. Always transport hot parts using a pair of pliers or even a cold metal plate as a carrier. 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, commonly referred to as gas welding, is a process which relies on combustion of oxygen and acetylene. Of course, getting to show off flying sparks while you work is a nice bonus.
Physical mobilitymovement from place to place on the job, considering distance and speed 2. In this process, mostly oxy acetylene gas is used as fuel gas. Mar 30, 2020 when standard welding tips are used, the maximum flame velocity is so 1ow that it interferes seriously with heat transfer from the flame to the work. Oxy fuel welding commonly called oxyacetylene welding, oxy welding, or gas welding in the u. For use with fuel gases acetylene, hydrogen and propylene. The torch itself can range in size depending on the amount of heat output desired, but in general is about 12 inches long. This unit of competency defines the skills and knowledge required to prepare materials and perform routine oxy fuel gas welding of mildlow carbon steel and cast iron where the welding is not required to meet an australian standard or equivalent. Pass a written test on safety and operation procedures on the oxy acetylene unit with a minimum of 100 accuracy.
Hose fire caused by flashback in oxygen and acetylene. Fusion welding, with or without filler metal, in which the heat for welding is produced by the combustion of a fuel gas or gasses with an admixture of oxygen. Gas welding is a process of construction that involves the use of gases as well as oxygen to weld metals together. In this unit you will be introduced to oxy fuel cutting and the safety precautions required when using oxy fuel cutting equipment. When mixed together in correct proportions within a handheld torch or blowpipe, a hot flame is produced with a temperature of about 3,200c. Oxy fuel welding includes any welding operation that makes use of a fuel gas combined with oxygen as a heating medium. Fundamentals of gas cutting and welding ced engineering. When conducting oxy fuel cutting and welding operations, operators can experience backfires or flashbacks. Oxy fuel equipment is versatile, lending itself to welding, brazing, braze welding, silver soldering, metal heating for bending and forming and oxy fuel cutting. For all employees, instructors and students who will be working with oxyacetylene welding equipment and 3. How should welders move hot welded or cut parts manually within the welding shop. Oxyfuel oxyacetylene welding a guide to gas welding twi. A flashback arrestor or flash arrestor is a gas safety device most commonly used in oxy fuel welding and cutting to stop the flame or reverse flow of gas back up into the equipment or supply line. Many beginners want to begin with a particular process but its not always the ideal process to begin the learning process.
Using fuel gas and oxygen, the torch heats the metal pieces to the point that they become molten and join together upon cooling. Praxairs vast distribution network for welding and fuel gases in north america and our versatile supply system expertise help ensure that your gases are delivered costeffectively. Scope and application oxyfuel gas welding and cutting 14. It is, therefore, necessary that proper safety and operating procedures are understood prior to using such apparatus. Gas welding joins metal using the heat of a torch burning both oxygen and a secondary fuel. Part 1 1991 glossary for welding, brazing, and thermal cutting.
Welder and welding operator one who operates electric or gas welding and cutting equipment. Jun 12, 2017 oxy fuel welding is a very traditional type of welding, relying on a torch to weld the metals. Gas welding and cutting 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. The highest flame temperatures of the gases are obtained at high oxygento fuel gas ratios. The incident occurred when the welder was ready to ignite the cutting torch head. Explain how to select fuel gas welding equipment and supplies. In this unit you will be introduced to oxy acetylene welding and the safety precautions required when using oxy acetylene equipment.
Reverse flow check valves alone will not stop a flashback in the system. Gas welding is a fusion welding process in which the heat for welding is obtained by the combustion of oxygen and fuel gas. Choose from 58 different sets of welding oxyfuel flashcards on quizlet. The fuel gas may be acetylene, hydrogen, propane or butane. Other names for gas welding are oxyacetylene welding and oxy welding. Oxy fuel or oxy acetylene welding are gas welding procedures that were invented in the early 1900s. Mediumduty oxyacetylene cutting and welding outfit 770 502.
A mixture of oxygen and acetylene, burns as an intense focussed flame, at approximately 3,500 d. However, unlike these, oxy acetylene, or arc welding, is much more widely used since. 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. There are several potential hazards present when using oxy fuel equipment. This process can be done with or without help of filler material. Oxy acetylene welding is the most common fuel to use, but others can include natural gas, propane, mapp gas, gasoline or any number of hot gases. Mild steel is comprised of 98% iron, 1% manganese, carbon up to.
An oxy fuel torch is a device used in the heating, welding and cutting of steel and other metals. Each of the above type of welding can be further classified depending on other micro level characteristics. Tig welding 10 plasma welding 17 welding sheet 18 welding plate 20 welding pipes 22 defects in welds 24 the right gas. Air products welders handbook fusion welding the most widely used welding processes rely on fusion of the components at the joint line. Most commonly used fuel gas is acetylene and thus the name oxy acetylene welding oaw is also used for this process, when acetylene is used as a fuel. Oxy acetylene, gas welding rods the oxy fuel process is considered oldschool. This heat is further used to melt interface surfaces of welding plates which are held together to form a joint. The most commonly used method is oxyacetylene welding, due to its high flame temperature. These devices are mainly used in industrial processes where oxy fuel gas mixtures are handled and used.
Check if exposure recommends or requires a style of ppe. These ratios produce highly oxidizing flames, which prevent the satisfactory welding of most metals. Uses an electric arc between an electrode and the base material to melt the metals at the welding point. When you see the symbol, watch out, and follow the related instructions to avoid the hazard. Welding done by heating the workpieces with flames obtained from oxyfuel gases is. 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. Further information can be obtained in the welding institute technical note 7 safety in welding and cutting. Careless use of oxy fuel torches has caused many fires. Oxy fuel welding cutting involves combining what of the following. Genuine 6inch heating tips melt up to three ounces of gold or silver. An oxy fuel torch setup consists of the torch itself and associated tubing, regulators, and tanks.
And this welding process is still very popular today, mainly because it does not require much equipment, and does not require power. Applying fuel gas welding fgw processes and techniques. Air products range of fuel gases for welding and cutting. Safety for oxyacetylene welding thompson rivers university. A member has reported an incident in which a subcontractors oxygen and acetylene cutting hose burst and caught fire.
In both cases, the area just beyond the inner blue luminous cones is the hottest portion of the flame. Setup and shutdown procedure for oxyfuel cutting torch a handout containing the highlights of the video titled setup and shutdown procedure for oxyfuel welding. Its popular with metal artists and also used for soldering and brazing dissimilar or nonferrous metals. Although we will discuss some basic safety tips to lessen that potential, nothing can take the place of thoroughly reading your particular equipments operator manual and following all of the safety, operation and maintenance instructions it contains. In 1916, elmer smith from minneapolis, mn founded smith equipment company to build oxy fuel welding and cutting equipment. Identify safety practices that should be observed in fuel gas welding. A backfire is defined as the momentary recession of the flame into the torch, potentially causing a flashback or sustained. The molten pool is generally supplied with additional metal. Oxygenacetylene welding, or gas welding, is a process which relies on combustion of oxygen and acetylene. Video an introduction to gas welding oxyacetylene oxyacetylene gas welding is commonly used to permanently join mild steel. After completing this course, participants should be able to describe common oxy fuel gas welding applications and safety concerns associated with the use of oxy fuel gas welding equipment. Setup and shutdown procedure for oxy fuel cutting torch. Gas welding gas welding is a welding process that melts and joins metals by heating them with a flame caused by a reaction of fuel gas and oxygen. Module 2 thermal processes unit 1 introduction to thermal processes and safety unit 2 introduction to oxy acetylene welding unit 3.
Safety in gas welding, cutting and similar processes. Equipment safety accessories consumables new products special offers where to buy support. The process may be used with or without the application of pressure and with or without the use of a. Oxy acetylene torches can be used for a variety of processes, and is one of the many things that can be used to weld aluminum. Becareful not to let welding hoses come into contact with torch flame or sparks from cutting. 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 oxy fuel gas torch often called a blowpipe is a very powerful source of ignition.
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