In this article we will discuss about:- 1. Meaning of Arc Furnaces 2. Types of Arc Furnaces 3. Power Supply and Control. Meaning of Arc Furnaces: When a high voltage is applied across an air gap, the air in the gap gets ionised under the influence of electrostatic forces and becomes conducting medium. Current flows in the form of a [...]
In induction heating effect of currents induced by electromagnetic action in the charge is employed. The heat developed depends on the power drawn by the charge. The power consequently depends upon the voltage and resistance of the charge, because power drawn is equal to V2/R. So to develop heat sufficient to melt the charge, the resistance of the charge must [...]
In this article we will discuss about:- 1. Types of Resistance Furnaces 2. Application of Resistance Furnaces 3. Temperature Control. Types of Resistance Furnaces: 1. Salt-Bath Furnace: Salt-bath furnaces are used for the purposes of tempering, quenching and hardening of steel tools. The characteristics of salt-bath heating are rapidity and uniformity and selective localised heating combined with protection from oxidation. [...]
In this article we will discuss about the design of core and coreless induction furnace. Design of Core Induction Furnace: Fig. 3.12 shows a core type furnace. Core type furnace is essentially a transformer with the charge of metal to be heated as single turn short circuited secondary and magnetically coupled to the primary winding by iron core. The current [...]
There are three types of arc furnaces namely: 1. Direct Arc Furnace 2. Indirect Arc Furnace 3. Submerged Arc Furnace. Design of Direct Arc Furnace: Figure 3.16 shows a direct arc furnace. The chamber of the furnace is lined with refractory material. The arc is struck between the electrode and the charge. Three electrodes made of carbon or graphite are [...]
Here is an experiment on ‘Induction Furnace’ especially written for school and college students. Aim of the Experiment: Study of Induction furnace. Objective: The students may be familiar to study of induction furnace by visiting an industry. Material Required: High frequency induction furnace, raw scraps material, high frequency ac source. Theory: Induction Furnace: An induction furnace is an electrical furnace [...]