Ppt plasma arc welding powerpoint presentation, free download. Theyll give your presentations a professional, memorable appearance the kind of sophisticated look that todays audiences expect. We use your linkedin profile and activity data to personalize ads and to show you more relevant ads. The shielding gas flows through the outside gas nozzle, providing an optimum gas shield to the weld seam. Plasma is a thermally highly heated up, electrically conductive gas, which consists of positive and negative ions, electrons as well as of excited and neutral. This makes plasma welding suitable for joining very thin metal sheets with a thickness from 0. Mediumplasma welding o welding current from 15a to 100a. The arc is constricted with the help of a watercooled small diameter nozzle which squeezes the arc, increases its pressure, temperature and heat intensely and thus improves arc stability, arc shape and heat transfer characteristics.
Plasma welding is very similar to tig as the arc is formed between a pointed tungsten electrode and the workpiece. The arc is struck between the electrode and the metal. Plasmaarc welding is a substitute of tig arc process, offering greater welding speed and better weld quality, for welding thin metal section current at 0. Following are the disadvantages of plasma arc welding. Application of plasma arc welding small part welding. Worlds best powerpoint templates crystalgraphics offers more powerpoint templates than anyone else in the world, with over 4 million to choose from. Plasma arc welding paw is an arc welding process similar to gas tungsten arc welding gtaw. Ppt welding powerpoint presentation free to view id. The difference is that in plasma welding, the arc is sharply constricted by a cooled gas nozzle through which a flow of plasma gas is directed. The advantages of plasma arc welding are higher welding speed and less distortion as well as a higher insensitivity regarding changes in distance. Plasma arc welding paw is very similar to gas tungsten arc welding gtaw. The high temperature of this arc melts the metal to be welded, forming a molten puddle. As with radiation exposure to the eyes, the length and number of times that you are exposed to high levels of noise determine the extent of the damage to your hearing, so be sure to avoid repeated exposure to noise.
Plasma arc welding and machine seminar reportpdfppt download introduction. The eventual addition of wire is carried out on the outside of the torch. The result is a concentrated arc with maximum energy. Pdf prediction of welded joint strength in plasma arc welding. Like tigw, paw also uses the tungsten electrode and inert gases for shielding of the molten metal. Paw plasma arc welding the contribution of energy necessary for welding is ensured by the passage of an electric arc in an atmosphere of inert plasma gas between an infusible electrode and the parts to be assembled. Explore welding quizzes and presentations from miller, covering topics like mig, tig and stick welding, basic electricity and filler metal selection.
Arc welding machine instruction manual pdf download. Depress plasma start switch on torch begin cutting procedure. Oxyacetylene gas electric arc plasma arc laser fusion welding electrode coating core wire welding atmosphere arc stream arc pool solidified slag penetration depth weld. The melting action is controlled by changing the 1 amount of electric current that flows across the arc and 2. Principle of operation plasma arc welding is a constricted arc process. It can be used to weld any metal that can be welded using gas tungsten arc welding, which includes almost all commercially used alloys and metals. This easy to use plasma cutter has the power to cut up to 38 in.
The welding torch for plasma arc welding is similar in appearance to a gas tungsten arc torch, but more complex. Principle, variants, control and developments notescitation information published injournal of manufacturing processes, v. Medical and electronic components are sealed via this welding. For example, in the solid welding process named resistance seam welding, the welding join is produced in the wheel electrodes region by. Plasma arc welding paw wall poster hobart institute of. This project are for understanding the working, advantages and disadvantages of plasma arc welding, the viewers can also use it for their. It is also referred to as mag welding manual metal arc welding. A plasma cools off, the electrons move more slowly and are recaptured, and the plasma is no more unless the energy loss to its surroundings is replenished.
Modes in paw microplasma welding o welding current from 0. Keyhole welding o welding current above 100a, where the plasma arc penetrates the wall thickness. Airco model ppt200 plasma arc welder gas tungsten arc. A voltage imposed on a plasma accelerates the conducting charges and can maintain a plasma indefinitely. If you look at the schematic shown in figure 1 you can see that the arc in paw is created between a nonconsumable tungsten electrode and is constricted by passing through an orifice. Full penetration welding ofsheet and prate up to about 5mm thick in single pass keyhole mode. The key difference from gtaw is that in paw, by positioning the electrode within the body of the torch, the plasma arc can be separated from the shielding gas envelope. Pdf welding input parameters such as current, gas flow rate and torch angle. It is the state of the matter present in between the electrodes in any arc. Plasma arc welding paw is a process used in place of gas tungsten arc welding gtaw. Electrode must be fed downward at a constant rate to keep the right arc length. Ppt welding process powerpoint presentation free to. Paw process can consistently start an arc to the tip of wires or other small components and make repeatable welds with very short weld time periods.
The electrode also melts and adds metal to the puddle. The basic principle of mig welding is, an arc is maintained between the end of the bare wire electrode and the work piece where the heat source required to melt the parent metal is obtained. Plasma arc welding paw plasma arc welding paw is a process in which coalescence, or the joining of metals, is produced by heating with a constricted arc between an electrode and the work piece transfer arc or the electrode and the constricting nozzle nontransfer arc. O arc length is varied up to 20mm o used for welding thin sheets 0. The electric arc is formed between an electrode which is usually but not always made of sintered tungsten and the workpiece. In plasmaarc welding paw is an arc welding process, a concentrated plasma arc is produced and directed towards the weld area. The arc melts the end of the electrode wire, which is transferred to the molten weld pool. The plasma arc welding procedure is usually compared to the gas tungsten arc process. Fw processes that cannot be classified as arc, resistance, or oxyfuel welding use unique technologies to develop heat for melting applications are typically unique processes include. Our commitment is to provide plasma welding and tig welding solutions for a broad range of applications, specializing in the joining of small precision components. All plasma torches are water cooled, even the lowestcurrent range torch. Plasma arc welding and machine seminar reportpdfppt download. Plasma arc welding has gained importance in small and medium scale industries manufacturing bellows, diaphragms etc because of less expensive and easy to. A concentrated plasma arc is produced and directed toward the weld area.
Plasma 375 operating instructions and parts manual plasma cutter description the plasma 375 is an igbt inverter plasma cutter with thermal overload protection, a trafimet torch and a builtin gas regulator. Winner of the standing ovation award for best powerpoint templates from presentations magazine. The fusing of two or more pieces of metal together by using the heat produced from an electric arc welding machine. Ppt plasma arc welding powerpoint presentation free to. Advantages and disadvantages of plasma arc welding,cutting. If an electric arc between a tungsten electrode and the work is constricted in a crosssectional area, its temperature increases because it carries the same amount of current.
Shielded metal arc welding 1 shielded metal arc welding 2 shielded metal arc welding. Plasma arc welding paw is one of the important arc welding processes used in electronics, medical, automotive and aerospace industries due its high accuracy and ability of welding any hard. Ppt shielded metal arc welding powerpoint presentation. The quality of the plasma welding process is extremely high and usually higher than gas tungsten arc welds because there is little or no possibility of tungsten inclusions in the weld. Plasma is the state of the matter when part of the gas is ionized making it a conductor of electric current. The electrode is then removed, breaking the arc between the electrode and the metal. Shielding is obtained from the hot ionized gas issuing from the orifice, which may be supplemented by an auxiliary. When welding pipe, weld as many fittings as possible before taking the pipe into position, try to leave the welds that will be the most accessible and easiest to perform for last.
Plasma arc welding is considered to be an improvement upon the gtaw process because the arc is more focused. Describe the safety procedures for plasma arc processes. M p groover, fundamentals of modern manufacturing 4e. The macrostructure of representative laser, electron beam and plasma arc. Medium plasma welding o welding current from 15a to 100a. Ppt of plasma arc welding, detailed overview paw slideshare. Electron beam, plasma arc and gas tungsten arc weld samples were prepared by weld.
Keyhole mode usually in flat position, rarely for tube and pipe welding meltinmode applications similarto gtaw lecture 5 p 11. Hobart institute of welding technology 400 trade square e troy, oh 45373. Due to the stabilizing effect of the plasma it is possible to work even with low currents. Arc welding is a fusion welding process in which the heat required to fuse the metal is obtain from the electric arc between the base metal and an electrode. When welding very thin metals, it should have a minimum target amperage of 2 amps.
Plasma is a high temperature ionised gas which is a mixture of positive ions. Plasma arc welding is an arc welding process that melts and joins metals by heating them with a constricted plasma arc established between a tungsten electrode and the metals. Low velocity plasma and diffused arc is generated in the tig welding while in case of paw very high velocity and coherent. A manual plasma arc welding machine is used for the present work with the. Deposition rates for plasma arc welding are somewhat higher than for gas tungsten arc welding and are shown by the curve in figure 1041. Welding is initiated by an electric arc transferred from a torch body to the workpiece, via a high temperature, high velocity plasma jet forced. Operating instructions and parts manual plasma cutter.
Plasma arc welding is a welding process utilizing heat generated by a constricted arc plasma jet struck between a tungsten nonconsumable electrode and either the work piece transferred arc process or water cooled constricting nozzle nontransferred arc process. Paw plasma arc welding pjpw plasma jet plasma arc welding gmgmma gasmixture shielded metalarc welding magm. The electric arc is formed between an electrode and the. A plasma is an ionized very hot gas composed of nearly same numbers of electrons and ions. The plasma welding process was introduced to the welding industry in 1964 as a method of bringing better control to the arc welding process in lower current ranges. Download as ppt, pdf, txt or read online from scribd. It produces wider welds and heat affected zones compare to lbw and ebw. Tig and plasma processes gases and welding equipment.
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