Disadvantages of Induction Motor: The disadvantages of 3 phase induction motor are: The induction motors have a poor starting torque. PRINCIPLE When the metallic workpiece (usually steel) is placed in a coil and current is flown In the coil then current is induced on the surface of the metallic workpiece and it is heated upto above its critical temperature. When you turn on an induction cooktop, a magnetic field underneath the surface is activated. Induction hardening is a type of heat-treating process that typically subjects a metal part under induction heating and quenching. The advantage of induction hardening is that the process is quick, efficient and surface degradation is minimal. There are disadvantages with the single shot approach. Laser hardening. Induction Motor Disadvantages: Some of the disadvantages of induction motors compared to dc motors and synchronous motors are: 3 phase induction motors have poor starting torque and high have in rush currents. 1. Flame Hardening. Disadvantages: Greater forces are required As a result, they draw inrush currents causing momentary voltage drop. 2. There are a lot of disadvantages of the single shot hardening: The coil which is used in the single shot hardening has a very complex design. 3. 4. Induction hardening can be easily automated and is suitable for complex geometries, especially in mass production! • But the disadvantages of these system is they generate a heat • To avoid this heat generate used laminated cores and other methods to minimize the effects • Engineers at Midvale Steel and The Ohio Crankshaft Company drew on this knowledge to develop the first surface hardening induction heating systems using motor generators. Flame hardening is similar to induction hardening, in that it is a surface hardening process. Source: Abstracted from Handbook of Engineering Materials, 5 th Edition. 2. The induction heating heat treatment also has some drawbacks or disadvantages. The process cannot be applied for all the alloy steels. So the motor is not suitable for high power applications like traction systems etc. Induction heating for practically any industrial heating application EFD Induction has to date installed more than 20,000 induction solutions in many of the world’s most demanding industries. Advantages and disadvantages of induction heating technology United Induction Heating Machine Limited We are experienced in Induction Heating,induction heating machine,Induction Heating equipment.They are widely used in induction heating service, induction heat treatment, induction brazing, induction hardening,induction welding, induction Hardening. Principles of Induction Hardening and Inspection / 59. hysteresis energy losses. It helps to obtain selective localised hardening without effecting the core or other sections of the part, and the properties. Flame hardening can not be applied as precisely as other case hardening processes, such as induction hardening or boronizing. Tempering is a low temperature (below A1) heat treatment process normally performed after neutral hardening, double hardening, atmospheric carburising, carbonitriding or induction hardening in order to reach a desired hardness/toughness ratio. We design, build and repair high quality general purpose and fully automated induction generators, process development, and personalized consulting for each and every one of our clients. The workpiece weight is also the same, and the 8-ton load corresponds to 2,667 shafts. Induction Heat Treating – Zone Hardening and Scanning. Hardening is a process of heating followed by cooling generally fast for increase hardness and mechanical strength of steel. 3. Not only ensuring cooking performance, the kitchen also brings high safety for users as well as saves costs. An old-fashioned, but still useful, explanation of the hysteresis loss states that it is caused by friction between mole-cules when the material is magnetized first in one direction and then in the other (Ref 4). 4. The components are heated by means of an alternating magnetic field to a temperature within or above the transformation range followed by immediate quenching. Induction hardening is widely used process for the surface hardening of steel. some common surface hardening techniques • induction hardening • flame hardening • laser beam hardening • electron beam hardening 4. Example 2: Induction Hardening of Quenched-and-Tempered Steel (42CrMo4) The case-hardening depth is approximately 2 mm and the hardness is 57-62 HRC by single-shot hardening. For the mass production of components in medium or large quantities however, induction hardening offers a range of benefits: With a suitable hardening machine, induction hardening can be fully integrated in the cycle of the production line and automated. The following will show some of the advantages and disadvantages of induction heat treatment. Case hardening solutions, meanwhile, work best on larger, less geometrically detailed components, especially when they require the speed that comes with a batch processing production run. Unlike hot working, the inclusions and grains distort to follow the contour of the surface, resulting in anisotropic engineering properties. 6. The Induction Hardening Job Work coil can be designed to accommodate any geometric shape that will allow access to the contour to be heat treated and quenched accordingly. Induction cooktops and ranges cook faster than regular electric ranges, but you’ll have to make some adjustments to use them. Induction hardening can be applied to a wide range of steels and cast irons. Induction hardening … The rapid heating drastically reduces the heating time to increase productivity of the heat treatment section. Even though there are a few drawbacks, you can overcome them. advantages and disadvantages of the different surface hardening processes. Localized areas can be heat treated; Very short surface heat-up times Zone Induction Hardening: The beauty of induction heating is that you can localize the heat by positioning the induction coil right at the part of the workpiece, or zone, that you wish to heat treat without affecting the rest of the workpiece area. The classical hardening method is case-hardening, where the complete workpiece has to be heated for hours to reach the desired hardness. A large number of steels could be flame-hardened. During cold working the part undergoes work hardening and the microstructure deforms to follow the contours of the part surface. Scaling and hardening distortion are less than with flame hardening! Advantages & Disadvantages Of Induction Cooktops Induction cooktops are very different from all the other cooktops in the market, as they directly heat the pan and not the hob ring. Both methods, case hardening and induction hardening, have advantages and downsides. Electromagnetic induction heating disadvantages: No product is perfect, it also has some shortcomings. The shaft is the same dimensions as example 1 (30 x 500 mm). On weighing the pros and cons of both heat hardening methods, the induction technique is the in-line but scalable winner. In many ways, flame hardening is similar to induction hardening. Heat is applied to the part being hardened, using an oxy- acetylene (or similar gas) flame on the surface of the steel being hardened and heating the surface above the upper critical temperature before quenching the steel in a spray of water. Normally, medium-carbon steels (0.35-0.5% carbon), with or without alloying additions, are used to ensure a satisfactory hardening response, final choice depending on required surface hardness and core properties. Here’s how, from the experts at Consumer Reports. Advantages. Induction cookers have many advantages over electric stoves such as energy savings, cooking speed, and cleaning simplicity; however, they do have a few potential disadvantages. Advantages and Disadvantages of Flame-Hardening: 1. But that doesn't mean the induction hob is completely good, it also has disadvantages that users need to pay attention to. After conducting this specific process, the metal part is intended to undergo a martensitic formation, allowing it to obtain features and properties that it does not possess before. DUOLIN induction heaters can precisely meet your specific needs of induction heating, induction forging, induction brazing, induction hardening, induction annealing, induction tempering, and hot pipe … Laser-beam hardening (laser hardening) offers even shorter heating times of the surface than in induction hardening. Advantages and Disadvantages of Induction-Hardening of Steels: a. It works best on crankshafts and on gear teeth as a localized solution. b. The Induction Hardening Job Work coil can be designed to accommodate any geometric shape that will allow access to the contour to be heat treated and quenched accordingly. An expensive grinding process is to be adopted after nitriding due to the formation of a thin layer which is in white color. More and more companies are opting for induction-based hardening solutions. The answer is: induction hardening. Therefore these motors are not widely used for applications which require high starting torques like traction systems. Oxidation and/or decarburization can occur on the material during the process. Compared with flame hardening, induction heating equipment is more complex, and adaptability to poor, difficult to guarantee the quality of some of the complex shape of the workpiece. Induction cookers are gradually conquering the needs of many families because of its great use. Flame hardening can be done of any shape, like flat, circular, irregular shapes, etc. Are you looking for support or purchase information, please contact us here This kind of hardening has its disadvantages, especially when it comes to the mass production of gears. 7. The Difference Between Flame Hardening and Induction Hardening. Tempering. Depth of hardness is less. For example, the equipment is relatively complicated, the cost of inputting at a time is relatively high, and the inductive components (induction coils) are poorly interchangeable and adaptable, and are not suitable for application on some complicated shapes. 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