Oxyfuel gas cutting process pdf

Oxyfuel cutting is a family of cutting processes which heats the work metal to its kindling point, causing it to burn in a stream of oxygen. The process consists of preheating the metal to be cut to its ignition oxidation temperature, i. 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. Apr 16, 2017 today we will learn about gas welding principle, working, equipments, types, application, advantages and disadvantages.

Esabs experience with oxyfuel cutting dates back to 1907. Oxyfuel gas cutting ofc includes a group of cutting processes that use controlled chemical reactions to remove preheated metal by rapid oxidation in a stream of pure oxygen. Oxyfuel welding, heating and cutting concoa gas pressure. Thermal cutting processes free download as powerpoint presentation. Competencies given a functional oxyfuel gas unit, instruction and demonstration of use, each student will be able to. What functionalities should you take into account when automating this cutting process. Oxy fuel welding includes any welding operation that makes use of a fuel gas combined with oxygen as a heating medium. Gas cutting the common methods used in cutting metal are.

Once selected, the oxyfuel cutting process may be controlled automatically by the cnc control or manually by the switches on the panel. 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 the material will be less than that of a. Automatic process control oxyfuel cutting gce group. Preheat flame temperatures will range from 4,440 to 6,000 f depending upon the fuel gas used and the adjusted ratio of oxygen to fuel gas. An oxyfuel torch can be fitted with cutting attachments instead of using a welding head. To attain a similar adiabatic flame temperature the o2 proportion of the gases passing through the burner is higher, typically 30%, higher than that for air of 21%. After all its about the quality of the entire fitting contour to reduce fitting and. Fundamentals of gas cutting and welding ced engineering. In the process of oxyfuel combustion the oxygen required is separated from air prior to combustion and the fuel is combusted in oxygen diluted with recycled fluegas rather than by air. Experienced operators can achieve a level of cut quality that rivals a machined surface, and do it in a fraction of the time cost of hard tooling. Oxyacetylene welding, commonly referred to as gas welding, is a process which relies on combustion of oxygen and acetylene. The oxyfuel process utilizes a flame to generate heat for cutting, welding and brazing. Today we will learn about gas welding principle, working, equipments, types, application, advantages and disadvantages. Oxyfuel combustion is the process of burning a fuel using pure oxygen instead of air as the primary oxidant.

In oxy fuel gaswelding processes, the combustion takes place in two stages. Success factors in oxyfuel cutting include the fuel gas chosen for preheating acetylene, propane or natural gas. The oxyfuel gas welding processes employ several types of gases, which is the primary distinction among the members of this group. Oxyfuel gas cutting and welding operation of oxyfuel torches involves oxygen and flammable gases under pressure, open flames, flying slag and hot metal, meatl fumes and combustion products. Natural gas is the preferred fuel gas in areas where.

In this quick guide, youll learn more about oxyfuel cutting, what it is, how it works and how it compares to other cutting technologies. Open acetylene fuel gas valve on torch handle for 3. However, its still widely utilized today, and its still a very important aspect and technology of many industries. In this process, oxygen gas and electrodes are used to cut roughly mild steel, lowalloy steel, stainless steel, copper, bronze, brass, monel, metal etc. Oxyfuel gas cutting welding, brazing and soldering. In modern steelage the steelmakers cut iron and steel by oxyacetylene, oxyhydrogen, oxy propane, oxynatural gas cutting blowpipes easily, speedily, and cleanly. Hydrogen is sometimes used as a fuel gas, especially under water to provide a powerful preheating flame. When using the oxygas cutting process, you heat a spot on the metal to the kindling or ignition temperature. 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. 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. Vsa oxygen was approximately 36% slower than cylinder when used with propane, and 45% slower when used with gasoline.

Kinetics of oxyfuel gas cutting of steels article pdf available in journal of the brazilian society of mechanical sciences and engineering 332. Gas welding is a type of liquid state welding process in which fuel gases burns to generate heat. French engineers edmond fouche and charles picard became the first to develop oxygenacetylene welding in 1903. When using an oxygenfuel gas process to perform welding or cutting, the operator. 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. Can be combined with plasma, or waterjet on the same part. The fitting of a flashback arrester is not a substitute for safe working practice. Pass a written test on safety and operation procedures on the oxyacetylene unit with a minimum of 100 accuracy. Mild steel is comprised of 98% iron, 1% manganese, carbon up to.

Gas welding is widely used for maintenance and repair work because of the ease in transporting oxygen and fuel cylinders. Oxygenacetylene welding, or gas welding, is a process which relies on combustion of oxygen and acetylene. 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. One advantage of the oxyfuel gas welding process is the control a welder can exercise over the rate of heat input, the temperature of the weld zone, and the oxidizing or reducing potential of. Jan 14, 2017 in this video we will discuss about what is oxygen acetylene welding. Once you learn the basics and begin to practice ofw, you will find the process is adaptable to brazing, cutting, and heat treating. Oxygenacetylene welding, or gas welding, is a process which relies on combustion of oxygen and. Mar 25, 2020 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. Reaction 1 initial reaction starts when acetylene and oxygen mixture burns. The electric arc takes the place of the heating flame of the oxyacetylene cutter. The ppe of choice for most oxyfuel and plasma welding and cutting operations is goggles or iruv protective faceshields. Although oxyfuel cutting is generally viewed as a mature uncomplicated process, those who work with it realize all too well that making it perform properly is no simple matter.

Care must be taken to avoid the contact of the flame with any combustible. Oxyfuel cutting can be used to cut thicknesses from 28. Grey gas real gas approximated here by sum of three grey gases for cfd codes gg 3, k low gg 2 gg 1, k high for grey gas, emissivity 1 exp kl, k absorption coefficient m1 real gas emissivity hottel charts have co2h2o band overlap corrections that do not apply for oxyfuel furnaces of callide size, therefore band models must be used. 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. Pdf kinetics of oxyfuel gas cutting of steels researchgate. These recommended practices for oxyfuel gas cutting include the latest procedures to be used in conjunction with oxyfuel gas cutting equipment and the latest. Fundamentals of gas cutting and welding cedengineering. This heat is further used to melt interface surfaces of welding plates which are held together to form a joint.

Safety in gas welding, cutting and similar processes page 7 of 11 protecting cylinders from flashbacks fit flashback arresters to both the oxygen and fuel gas hoses near to the regulators. Light the gas by means of a suitable sparklighter making sure that the sparklighter is held at right angles. Oxyfuel gas equipment has many uses welding, cutting, heating, straightening, and descaling. However, the process is comparatively slow and its only good for cutting carbon steel. There are several fuel gas and nozzle design options that can significantly enhance performance in terms of cut quality and cutting speed.

The kerf the width of cut should therefore be quite clean, and the top and. Oxyfuel cutting is a time consuming process, especially cutting thick walled materials. This article provides a detailed discussion on the principles of operation and the process capabilities of ofc. Oxyfuel cutting torches use a copper tip with a series of holes arranged in a circle to deliver a mixture of a fuel gas and oxygen to create a preheat flame. Once oxygen is mixed with a fuel gas, the temperature rapidly increases to a point high enough to melt and wash away the steel. Oxyfuel cutting is a chemical reaction between pure oxygen and steel to form iron oxide. Aristotle section i oxyfuel cutting introduction oxyfuel cutting is a family of cutting processes which heats the work metal to its kindling point, causing it to burn in a stream of oxygen. Safety in gas welding, cutting and similar processes hse. Roughly 2 to 3 times more welding goggles and faceshields are used per year than welding helmets for electric arc welding but little is said or written about them because they pale in comparison to the interest in hightech adf equipped electric arc helmets. Flame cutting is used to make the edges of the work pieces and for sheet cutting. By understanding these fundamental relationships, all operators can reason the.

Common terms for these processes are flame cutting, oxygen cutting, and burning. Pdf oxyacetylene flame cutting is a relevant and widespread industrial process. Oxyfuel oxyacetylene welding a guide to gas welding twi. Oxyfuel welding and cutting the oxyfuel system is an auxiliary technique to welding developed since 1903 and used to date in many industrial applications. The shortest distance through the material is a cut perpendicular to the wall. In this unit you will be introduced to oxyfuel cutting and the safety precautions required when using oxyfuel cutting equipment. When mixed together in correct proportions within a handheld torch or blowpipe, a hot flame is. Open the fuel gas control valve on the blowpipe and adjust the regulator to give the correct working pressure see chart on page, this ensures that any air or oxygen is purged from the hose. Thermal cutting processes industries industrial processes. Conclusion vsa oxygen that is being used for oxyfuel cutting has the ability to cut through the same thickness of steel that. Conclusion vsa oxygen that is being used for oxyfuel cutting has the ability to cut through the same thickness of steel that cylinder oxygen can. This booklet has divided the oxyfuel cutting process into several key elements, their effect on quality and their interaction with each other.

The cutting attachments can be used to cut steel approximately 6 inches thick. Dross the material oxidized and molten metal that is expelled from the kerf when cutting using a thermal process. Dec 12, 2019 an oxyfuel torch can be fitted with cutting attachments instead of using a welding head. Cutting of metals by means of flame has many advantages over other methods, specially when the metal is of irregular shape. The 62page book describes the oxyfuel gas cutting process and latest procedures and safety requirements, using terminology compatible with iso documents. After all its about the quality of the entire fitting contour to reduce fitting and welding time. Oxyfuel cutting cannot cut nonferrous metals such as aluminum, stainless, brass or copper. The preheating is done by oxyacetylene gas flame, which is supplied from surrounding openings of the cutting torch. 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.

Oxyfuel cutting is a process which has been around for over 100 years. Co 2 storage system at the oxyfuel ccs plant in schwarze pumpe. The basics of oxy fuel cutting whats more to automate on oxy fuel cutting then merely flame onoff. The ideal fuel gas will depend on the thickness of the. 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. Setup and shutdown procedure for oxy fuel cutting torch.

Oxyfuel gas is also commonly used in cutting torches to cut and separate metal plates and other parts. A flame burning with correct proportions of fuel gas and oxygen. Are we wellinformed enough to make the best choice of fuel gas for oxyfuel cutting. Gas pressures are regulated with customer supplied regulators attached to the. Setup and shutdown procedure for oxyfuel cutting torch a handout containing the highlights of the video titled setup and shutdown procedure for oxyfuel welding.

Module 2 thermal processes unit 1 introduction to thermal processes and safety unit 2 introduction to oxyacetylene welding unit 3. These recommended practices for oxyfuel gas cutting include the latest procedures to be used in. Since the nitrogen component of air is not heated, fuel consumption is reduced, and higher flame temperatures are possible. This article discusses the operation principles and process capabilities of the ofc. When this temperature is attained, a jet of high pressure oxygen from a central opening of the. French engineers edmond fouche and charles picard became the first to develop oxygen acetylene welding in 1903. The oxyfuel process is the most widely applied industrial thermal cutting process because it can cut thicknesses from 0. The oxyfuel cutting process is capable of cutting steel whose composition is less than. Learn vocabulary, terms, and more with flashcards, games, and other study tools. Oxyfuel welding commonly called oxyacetylene welding, oxy welding, or gas welding in the u. Most cost efficient process for carbon steel cutting. Oxyfuel cutting is a process used to sever steel via a chemical reaction of oxygen with the base metal at elevated temperature. Oxyfuel cutting operations can use gasses such as oxygen, acetylene, mapp, natural gas and propane.

However, the requirements of this standard are generally. To begin oxygenacetylene welding or cutting, open the. The most important oxyfuel gas welding process is oxyacetylene welding. One advantage of the oxyfuel gas welding process is the control a welder can exercise over the rate of heat input, the temperature of the weld zone, and the oxidizing or reducing potential of the welding atmosphere.

Cutting speed on a thin plate less than or equal to 12 is controlled by preheat intensity flame temperature and in heavier plate cutting by oxygen stream shape and quality, not the fuel type. In this video we will discuss about what is oxygen acetylene welding. Follow the precautions in this safety section and those throughout this manual for your personal safety and the safety of people near the equipment. Safety in gas welding, cutting and similar processes. For long lengths of hose, fit arresters on both the torch and the regulator.