Deepakkumar Yadav
Advantages and Disadvantages of Dielectric Heating Advantages of Dielectric Heating : The heating is uniform. It is possible to control the heat automatically. There are no-products of the heating process. heating process is neat and clean. The process of heating is free from gases and ash. It is possible to achieve high rate of heating. … Read more
Line Contactor in Welding Transformer Line contactor is an electronic switch , which can connect or disconnect ac supply to the welding transformer primary at the time of welding . It is controlled by the control signals from the control circuits. Types of line contactors : Here we have to study two types of line contactors, … Read more
Principle of Resistance Welding Figure shows the basic arrangement for the resistance welding. The two metal sheets to be welded are clamped tightly together with external pressure, between the two electrodes. The welding current flows through these electrodes and through the metal pieces to be welded. Due to the flow of welding current through the … Read more
Block Diagram of Dielectric Heating The block diagram of dielectric heating as shown in Figure consists of RF source, electrodes and timer. RF source is generating high frequency output using tank circuit. The frequency of application is obtained by tuning of tank circuit. The electrodes are provided with the output from tank circuit. The job … Read more
Application of Dielectric Heating Dielectric heating is suitable for following industrial applications : Gluing, curing and drying of wood. Preheating plastic perform to condition them for moulding. Plastic sewing. Drying and heat treatment of natural and synthetic rubber, rayon, nylon, etc. Processing of chemicals during manufacture. Curing of sand cores in foundaries. Sterilization of medical … Read more
SCR Line Contactor in Welding Transformer The circuit diagram of SCR line contactor is shown in Figure. This circuit consists of two SCRs connected in the inverse parallel or back to back manner. This circuit is obtained by replacing the ignitron tubes by SCRs. Smaller ignitrons can be replaced by using a pair of water cooled … Read more
Definition and Principle of Dielectric Heating Definition of Dielectric Heating : Dielectric heating is another type of RF heating. It makes use of the dielectric loss in imperfect dielectric materials and is therefore, suitable for heating non-metals. Principle of Dielectric Heating : In dielectric heating, a high frequency, high voltage ac voltage is applied across a dielectric … Read more
Electric Welding Control Welding is important and necessary process required in fabrication. There are basically three types of welding systems : 1. Forge welding 2. Fusion welding 3. Resistance welding 1. Forge welding : Here the jobs that are to be welded are heated upto their plasticity stage and then the jobs are superimposed to … Read more
Applications of the Induction Heating Q. Induction Heating Applications Q. Induction heating Q. Applications of Induction Heat Treating Induction heating is used in many industrial applications, some of them are listed here : Surface hardening of steel. Annealing of brass and bronze items. Soldering. Brazing. 1. Surface hardening of steel : In induction heating heat is concentrated … Read more
Comparison of Induction Heating and Dielectric Heating Sr. No. Parameters Induction heating Dielectric heating 1. Principle Electromagnetic induction Electrostatic induction 2. Area of heat generation On the surface Inside the material 3. Type of heating Non uniform Uniform 4. Frequency of generator 200 to 500 kHz 1MHz to 50 MHz 5. Equipment cost Low High … Read more