This is the gas that is ionised in the plasma process and exits through the nozzle orifice. Scribd is the worlds largest social reading and publishing site. In order to discuss the various aspects of welding, cutting and brazing safety, first we need to cover the basics in this first module. Safety in gas welding, cutting and similar processes. In modern steelage the steelmakers cut iron and steel by oxyacetylene, oxyhydrogen, oxy propane, oxynatural gas cutting blowpipes easily, speedily, and cleanly.
In this quick guide, youll learn more about oxyfuel cutting, what it is, how it works and how it compares to other cutting. Functions of gas in plasma arc cutting plasma gas is also called the cutting gas. The common methods used in cutting metal are oxygas flame cutting, air carbonarc cutting, and plasmaarc cutting. Gas detectors must be installed for detecting gas leaks. Gas hoses to be checked for any damage before starting welding. Oxy acetylene cutting a circle accurately using a cutting torch. Reactive fusion cutting if the assisting gas is also capable of reacting exothermically an extra heat source is added to the process. The cylinder valve and other fittings used with gas cylinders must be compatible with the type of gas used. Oxyacetylene is used more for cutting than for welding, but natural gas, propane and propylene are also used for cutting.
Oxyfuel cutting is a process which has been around for over 100 years. In this video we will discuss about gas welding basics. Safe use of gas cylinders greasy and oily materials must never be used on oxygen. The excess oxygen causes increased oxidisation during the brazing process and is to be avoided. The various alloy elements found in steel affect the ability of the oxygen to cut the metal. Oxyfuel cutting is a thermal cutting process that uses oxygen and fuel gas such as acetylene, propane, mapp, propylene and natural gas to cut through materials. After all its about the quality of the entire fitting contour to reduce fitting and. Gas welding oxyacetylene a number of welding processes use a flame produced by burning a mixture of fuel gas and oxygen. Oxyfuel cutting ofc is similar to ox fuel welding except that. 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. However, its still widely utilized today, and its still a very important aspect and technology of many industries. Plasma is a gaseous mixture of positive ions, electrons and neutral gas molecules. Ppt safety in gas cutting process powerpoint presentation free to download id.
Cutting torch tips for oxygen acetylene cutting youtube. The process is a fusion welding process where the joint is. This gas cutting and welding safety presentation very useful for welders, gas cutters, fabricators and trainers. Safety presentation oxyfuel gas welding and cutting equipment. Introduction oaw is a welding process that heats the base metal with a controlled mixture of acetylene and oxygen gas. Oxyfuel welding, heating and cutting process manual installation and operation instructions before installing or operating, read and comply with these instructions controls corporation of america 1501 harpers road virginia beach, va 23454 to order call 18002250473 or 7574228330 fax 7574223125 april 2001 supersedes. After cutting start closing from oxygen and then da.
Plasma arc welding paw plasma arc welding paw is an arc welding process similar to gas tungsten arc welding gtaw. Opening and closing procedure gas cutting equipment an oxidising flame this setting has an excess of oxygen. When engaging in welding, cutting, or brazing activities, various fumes, gases and vapors are generated from the metals, fluxes, and fillers being used in addition to coatings, paints, galvanizing and plating. Gas cutting the common methods used in cutting metal are. In order to protect workers from these, appropriate personal protective equipment ppe in the form of a.
Plasma arc cutting process and equipment considerations. Welding and cutting techniques, welding defects and practical skill. Oxyacetylene cutting and welding is the property of its rightful owner. Oxyfuel cutting can be used to cut thicknesses from 28. In this part of the series the process fundamentals are described with emphasis being placed on the operating features and the advantages of the many process variants. This presentation i was prepared for mrf medak plant near hyderabad. 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. Welding, cutting, and brazing welding is a process that joins materials together by melting a metal work piece along with a filler metal to form a strong joint. Identify gas welding tools, equipment, care and use them observing safety rules and regulations. The shortest distance through the material is a cut perpendicular to the wall. The basics of oxy fuel cutting whats more to automate on oxy fuel cutting then merely flame onoff. Welding also called fusion welding is the process of heating two or more materials usually metals to a melting point where they can coalesce, sometimes with additional material a third metal called filler.
Oxyacetylene cutting safety occupational safety and. Gmaw gas metal arc welding fcaw fluxcored arc welding gtaw gas tungsten arc welding smaw shielded metal arc welding caca carbon arc cutting process among the newer advanced waveform control technology processes is surface tension transfer, or stt. The method used depends on the type of metal to be cut and the availability of equipment. Pure oxygen, instead of air, is used to increase the. The basic process in plasma cutting and welding is to create an electrical channel of superheated, electrically ionised gas i. This heat is further used to melt interface surfaces of welding plates which are held together to form a joint. Natural gas is the preferred fuel gas in areas where. Fundamentals of gas cutting and welding cedengineering. The adobe flash plugin is needed to view this content. Gas welding gas welding is also named as oxyfuel gas welding ofw. This booklet has divided the oxyfuel cutting process into several key elements, their effect on quality and their interaction with each other. This flame is characterized by a small thin inner cone and a hissing sound. Oxyfuel gas cutting and welding processes unit 2 tsm ppt. Factors affecting quality in oxyfuel cutting operators manual.
Oxyacetylene cutting safety in agriculture osha standard 1910. Safety in gas cuttingsafety in gas cutting prevention of fireprevention of fire move the work pieces to a safe location for carrying outmove the work pieces to a safe location for carrying out the hot work process. Features of fusion welded joint a typical fusion weld joint consists of fusion zone, weld interface, heat affected zone and unaffected base. Cutting of metals by means of flame has many advantages over other methods, specially when the metal is of irregular shape. However, before learning about the equipment, you must be familiar with the gases most often used to fuel the cutting equipment. Identify gas and arc welding defects and adopt remedies. The kerf the width of cut should therefore be quite clean, and the top and bottom edges should be square. The heat from the torch allows for the melting and mixing of the base metal and filler metal to form a solid weld. Opening and closing procedures on gas cutting equipment. Safety in gas cutting process linde flame plasma cutting cutogen5 torch total no.
Fundamentals of gas cutting and welding ced engineering. It is manufactured by the chemical reaction between calcium carbide, a gray stonelike substance, and water. On examining melted oxides after cutting, it has been found that they contain up to 30 per cent unmelted steel, which has. Stt is a low heat input mode of weld metal transfer, which incorporates. Welding process wmm2 btusecin2 gas tungsten arc welding 0. This is not a comprehensive oxyfuel safety course by any means but i tried. X this site uses cookies and other tracking technologies to provide you with our services, enhance the performance and functionality of our services, analyze the use of our products and services, and assist with our advertising and marketing efforts.
A free powerpoint ppt presentation displayed as a flash slide show on id. Oxyfuel gas cutting is functional for use with low carbon and low alloy steels, with a carbon content generally restricted to 110 to 310 of 1%. 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. Tsm 233 metallurgy and welding process applications of gas welding and cutting gas welding and cutting equipment is still widely used in industry. Plasma cutting function, advantages and disadvantages. Explosion when cutting up or repairing tanks, drums and tyres. Welding is a materials joining process which produces coalescence of materials by heating them to suitable temperatures with or without the application of pressure or by the. By understanding these fundamental relationships, all operators can reason the. Today we will learn about gas welding principle, working, equipments, types, application, advantages and disadvantages.
Image result for welding welding is a fabrication or sculptural process that joins materials, usually metals or thermoplastics, by causing fusion, which is distinct from lower temperature metaljoining techniques such as brazing and soldering, which do not melt the base metal. The plasma arc cutting process is illustrated in fig. Ppt oxyfuel cutting powerpoint presentation, free download id. The fuel gas commonly acetylene, when mixed with proper proportion of oxygen in a mixing chamber of welding torch. 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. Presentations and quizzes explore welding quizzes and presentations from miller, covering topics like mig, tig and stick welding, basic electricity and filler metal selection. Gas welding derives heat from the combustion of fuel gas such as acetylene in combination with oxygen. Safety in gas welding, cutting and similar processes page 4 of 11 explosion when cutting up or repairing tanks, drums and tyres figure 2 cutting up scrap if a welding blowpipe or burner is used on a tank or drum containing flammable material solid, liquid or vapour, it can explode.
Safety in gas welding, cutting and similar processes page 4 of 11. Oxyfuel cutting is a time consuming process, especially cutting thick walled materials. When the heating is provided by gas, naturally, the term used is gas welding. For a typical oxygas cutting outfit, also referred to as a cutting rig figure 41, you need. The preheating is done by oxyacetylene gas flame, which is supplied from surrounding openings of the cutting torch. What functionalities should you take into account when automating this cutting process. Usually the reactive gas is oxygen or some mixture containing oxygen.
Indane nanocut an lpg variant enriched with proprietary additive formulation is a safe and efficient alternative to the hazardous oxyacetylene gas used for metal cutting. If a welding blowpipe or burner is used on a tank or drum containing flammable material solid, liquid or vapour, it can explode. Image result for welding welding is a fabrication or sculptural process that joins materials, usually metals or thermoplastics, by causing fusion. The electric arc is formed between an electrode which is usually but not always made of sintered tungsten and the workpiece. The process consists of preheating the metal to be cut to its ignition oxidation temperature, i. The gas passing through the kerfis not only dragging the melt away but also reacting with the melt. Then open the oxygen valves to the required pressure. This process generally uses a single gas usually air or nitrogen that both cools and produces the plasma.
If the oxy welding cutting equipment is to be operated in a dangerous or hostile environment, the userclient is responsible for conducting an appropriate risk analysis and applying suitable controls to mitigate those. The process is a fusion welding process where the joint is completely melted to obtain the fusion. Open the da regulator,the torch valve and light the gas. Its pretty safe when used properly, but not safe at all when not used properly. Theory of oxyfuel gas cutting the harris products group. In case of a beveled cut an angled cut for weld preparation the cutting torch will be at an angle and the heat transfer to. If so, share your ppt presentation slides online with. The plasma arc process has always been seen as an alternative to the oxyfuel process. Gas welding is a type of liquid state welding process in which fuel gases burns to generate heat.
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