Posted in Manufacturing Process

Open Hearth Furnace Usage & Schematic Diagram

In open hearth furnace, pig iron, steel scrap etc. are melted to obtain steel. This furnace is widely used in American foundries for steel production. The hearth is surrounded by roof and walls of refractory bricks as shown in image below. The charge is fed through a charging door and is heated to 1650°C mainly by radiation of heat from the burning of gaseous fuels above it. This heat is obtained by the burning of sufficiently pre-heated air and gas. Such pre-heated air of gas is obtained by passing them though arc shaped hot regenerators at a lower level. This contains fire bricks which are arranged…

Posted in Welding Engineering

Types of Gases Used in Gas Welding Process

In the gas welding process, the welding heat is obtained from the combustion of fuel gases in the presence of a supporter in combustion. And, in most of the gas welding process oxygen is use as a supporter for combustion. And the various fuel gases are hydrogen, coal gas, liquid petroleum gas (LPG), and acetylene etc. Oxygen. Oxygen is found nearly everywhere in nature, either in free state or in a combination with other elements. It is one of the chief constituents of atmosphere i.e.21% Oxygen and 78% Nitrogen. It is a supporter of combustion. Its chemical symbol is O2….