The microplasma arc can be operated at very low welding currents. Pdf developments in plasma arc cutting pac of steel alloys. Plasma arc cutting is an excellent choice for most cutting applications but it is particularly well suited for applications where speed and excellent cut quality are important. Pdf experimental investigation of the plasma arc cutting. The plasma arc cutting process severs metal by using a constricted arc to melt a localized area of a workpiece, removing the molten material with a highvelocity jet of ionized gas issuing from. Cnc plasma cutting machine operational manual machinemfg. The flying sparks and hot metal, hot workpiece, and hot equipment can cause fires and burns. Split pdf file separate one page or a whole set for easy conversion into independent pdf files.
In this study a 200a high tolerance plasma arc cutting htpac system is utilised to cut plates from 15mm thick mild steel sheets metals. Avoid plasma arc cutting use in areas which house chlorinated solvents and cleaners. The emphasis is made on physics of the arc operation and on heat. At the time of the osha inspection the company required employees near the plasma arc cutter to wear shade 3 welding glasses, while the plasma arc cutter operators were required to wear shade 5 welding glasses. It mentions advantages of plasma arc weldingcutting and disadvantages of plasma arc weldingcutting. The superheated plasma jet is focused through a constricted orifice or tip, which directs the arc to the work piece. Plasma arc cutting requires higher voltages than welding to start and maintain the arc 200 to 400 volts dc are common, but may also use torches designed with safety interlock systems which turn off the machine when the shield cup is loosened or if tip touches electrode inside the nozzle. A high velocity jet flow of hot ionized gas melts the metal and then removes the molten material to form a kerf.
At higher currents, from 15 to 200a, the process characteristics of the plasma arc are similar to the tig arc, but because the plasma is constricted, the arc is stiffer. However, as with any piece of equipment you need to know how and why it does what it does and the necessary precautions to do the job safely. Apr 24, 2020 the plasma arc cutting process cuts metal by melting a section of metal with a constricted arc. Arcwriter plasma marking system the hypertherm arcwriter is a dual gas plasma marking, scoring and punching system thats ideal for labeling parts, creating dimples for drill starts, and any other marking, scoring or punching anywhere you need to create temporary or permanent identification marks on metal surfaces. Plasma arc cutting is a process in which an electronic arc ionizes a gas, creating a superheated plasma arc column used to cut ferrous and nonferrous metal alloys.
Intense highfrequency noise is possible when cutting, especially with non transferred arcs, of levels 110 db which requires ear muff protection. Pdf the plasma arc cutting pac process was developed for difficultto machine materials in order to overcome the inefficiency and. Welding student grade record course outline modules. Plasma arc cutting is a process where an open arc can be constricted by passing through a small nozzle, from the electrode to the workpiece. Plasma arc cutting is based on the establishment of a direct current arc between a tungsten electrode and the surface of a conducting metal. View and download hypertherm max43 instruction manual online. The basic arrangement for a plasma arc cutting torch, similar to the plasma arc welding torch, is shown in figure 1071. Usually, to split a pdf you have to spend a lot of money on premium software.
The arc is created by ionizing a gas plasma gas and then blowing the ionized plasma towards the surface of the workpiece in order to form a conductive pathway down which the main plasma current passes. If you are not fully familiar with the principles of operation and safe practices for arc welding and cutting equipment, we urge you to read our booklet, precautions and safe practices for arc welding, cutting, and gouging, form 52529. When a solid is heated, the molecules start to vibrate more vigorously. Never touch any parts on the plasma arc cutter that are. This complete curriculum guide provides just about everything an instructor will need to get started teaching cnc plasma cutting in the high school, community college, university, trade or union school environment. Microhardness evaluation of steel en s233j2g3 in heat affected zone after plasma arc cutting. Hypertherm max43 instruction manual pdf download manualslib. Safe work procedure plasma arc cutting page 4 of 5 16. Leave the workpiece in place or on the workbench with the work cable attached during the cutting process.
Plasma arc welding is an arc welding process wherein coalescence is produced by the heat obtained from a constricted arc setup between a tungstenalloy tungsten electrode and the watercooled constricting nozzle nontransferred arc or between a tungstenalloy tungsten electrode and the job transferred arc. Information and directions for the student handout as it is currently written are listed at the end of this instructor guide. The plasma arc process has always been seen as an alternative to the oxyfuel process. Typical materials cut with a plasma torch include steel, stainless steel, aluminum, brass and copper, although other conductive metals may be cut as well. Xpr300 represents hypertherms most significant advance in mechanized plasma cutting technology ever and its now available in multitorch configurations. This switch allows each hypertherm plasma system is designed to be the operator to turn off the power supply quickly in used only with specific hypertherm torches. Learn vocabulary, terms, and more with flashcards, games, and other study tools. The plasma gas is heated by the arc to an extremely high temperature within the annulus and is ionised it becomes a plasma. However, for heavy sections of steel 1 inch and greater, oxyfuel is still preferred since oxyfuel is typically faster and, for heavier plate applications, very high capacity power supplies are required for.
The plasma arc cutting process is illustrated in fig. Hot metal and sparks blow out from the cutting arc. The objective of this work is to study the effects of plasma arc cutting process parameters on hazheat affected zone and bevel angle for low carbon steel 1010 material with thickness 4 mm, which. For additional air carbonarc and plasmaarc cutting information and activities, see also agricultural construction volume ii, unit iioxygas and other cuttingwelding processes. A plasma cutter will use this electrically conductive gas to transfer energy from a power supply to any conductive material, resulting in a cleaner, faster cutting process than with oxyfuel. Plasma cutting is a process that cuts through electrically conductive materials by means of an accelerated jet of hot plasma. Plasma arc machining is a metal removal process in which the metal is removed by focusing a highvelocity jet of high temperature 11,000c to 30,000c ionized gas on the workpiece. Workers inside a special chamber sizereduce a glovebox using plasmaarc cutting technology.
The xpr series plasmas represent hypertherms most significant advance in mechanized plasma cutting technology ever and its now available on all arc cut pro machines in single and dual plasma configurations. Plasma arc cutting article about plasma arc cutting by the. Section 2 introduction to plasma cutting plasma cutting basics what is a plasma. Automation is available with portable trolleys rail, profile cutting systems and cnc cutting systems. Operator manual pn 803980 revision 0 march 2001 hypertherm, inc. A processing method which takes oxygen or nitrogen as working gas, make use of hightemperature plasma arc heat to melt and evaporate the incision of the metal part and by means of the momentum of highspeed plasma flow to remove the molten metal in order to form slotting seam. The columnar arc is stable even when arc length is varied up to 20mm. The company reported no eye injuries from welding, cutting, or brazing activities. Plasma cutters generally just need clean compressed air to clean cut other metals. Lotos ltpdc2000d nontouch pilot arc plasma cutter tig welder and stick welder 3 in 1 combo welding machine.
Intense highfrequency noise is possible when cutting, especially with nontransferred arcs, of levels 110 db which requires ear muff protection. You can select pages in the visual interface or just type in the number of the pages you want to extract. Shark range new sk torches for manual cutting and skm for cnc automation allow cuts without high frequency for arc striking, thus reducing external. Advantages and disadvantages of plasma arc welding,cutting. The arc cut pro is designed not only for plate cutting, but also for running structural material such as channel, tubing, angle and beams. At the same time it expands in volume due to the high temperature and, being forced through the constriction of the nozzle, reaches very high velocity. Plasma cutting is typically easier for the novice to master, and on thinner materials, plasma cutting is much faster than oxyfuel cutting. Wear face protection helmet or shield with correct shade of filter to protect your face and eyes when cutting or watching. Plasma arc cutting process and equipment considerations. Transferred arc plasmaarc is used for cutting purposes fig. Our machines are capable to cut materials of up to 150mm6 inch thickness. As shown in the figure, there are four types of matter solid, liquid, gas and plasma. Parts, working principle, advantages, application and more. A highvelocity jet flow of hot ionized gas melts the metal and then removes the molten material to form a kerf.
Pdf experimental and theoretical statesoftheart in pac are considered. Check and be sure the area is safe before doing any cutting. Plasma arc cutting process and equipment considerations twi. Adding heat to material causes the molecules in it to vibrate or move more quickly. Plasma arc cutting system operator manual 803980 revision 0. Plasma arc cutting pac is a cutting process that uses an arc and a highvelocity, ionized gas coming through a constricting nozzle to cut all metals. Because of the intense heat of the plasma arc around 40,000 f 22,000 c compared to 5,700 f 3150 c, with gases used with oxyfuel torches the cut is. 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 is primarily due to the type of gas you are using. Modern welding, 11th edition page 8 gw online textbooks. Changed page description im200 rev 14 to 15 91801 1. The figure depicts how one matter is obtained from the other and vice.
Pdf the plasma arc cutting pac process was developed for difficulttomachine materials in order to overcome the inefficiency and. Hypertherm powermax 380 operators manual pdf download. The plasma arc also cuts ferrous and nonferrous metals much faster than. Describe the safety procedures for plasma arc processes. Dec 12, 2019 a common problem seen plasma cutting aluminum is that you may not get a clean cut and have to spend a lot of time cleaning the edge down. Pdf heat transfer in plasma arc cutting researchgate. The plasma arc cutting process cuts metal by melting a section of metal with a constricted arc. Plasma arc cutting article about plasma arc cutting by. Finish the cut, release the rigger and then pull the gun away from the work after the arc goes out. With high speed of technology development, plasma cnc machine plays an important role in industry, as it can cut any metal using only compressed air ignited at high voltage and high frequency.
Pcm1125 plasma arc cutting package f15482b february, 2002 these instructions are for experienced operators. A plasma is a state of matter like a solid, liquid or gas. Chapters cover history, safety practices, machine basics, software, tool paths, image imports and more. The plasma arc formation begins when a gas such as oxygen, nitrogen, argon, or even shop air is forced through a small nozzle orifice inside the torch. This page covers advantages and disadvantages of plasma arc welding and arc cutting. When you have completed your cut, close the valve on the gas cylinders and operate the gun trigger to release the gas pressure. Plasma cutting machine is a new type of hot cutting equipment, its working principle is based on the compressed air as working gas, high temperature and high speed of plasma arc as heat source, molten metal will be partially melted, and at the same time highspeed air blow away the molten metal, and form the narrow cut seam.
143 1482 548 1291 906 876 137 685 1562 538 1027 920 633 953 1499 1286 5 1323 1584 1630 24 1194 218 560 1280 847 1031 1439 349 868 550 776 660 741 767 46 855 1030 384 148 1249 839 1063