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Although this article started with a general overview of the iron and steel industry, we will refer only to one process for the rest of this feature, a gray iron foundry using an electric arc furnace. We will see how important brick and refractory are and why everyone should pay attention to their brick and refractory designs and installations.History and Background of the Electric Arc FurnaceThe electric arc furnace (EAF) has been around since the early 1900s and is primarily used to produce high quality alloy steels. EAFs have refractory-lined steel shells and vary ill size from only a few feet in diameter to twenty feet or more. The bottom, or hearth, of the furnace is dished to hold the metal charge. The vertical side walls include one or more doors and a tapping spout for removing the melted charge. The roof over the furnace is dome-shaped, and incorporates two or three openings near its center for the admission of electrodes into the furnace. The roof is usually detachable and is lifted off or turned aside for charging. The whole furnace structure is tilted forward and backward for slag skimming or tapping. The furnace capacity will depend upon the size of the furnace and can be less then one ton per charge to up to eighty-five tons per charge.

"We have a position sensor at each wheel and a speed sensor for each side of the machine," added Jason Osborn, a design engineer who was heavily involved in the electronic development of the A220. "We have an onboard controller that knows exactly what angle and speed the wheels are turning at."When you flip the switch in the cab from AWS mode, the controller knows the wheels have to be in a certain spot to accomplish skid steering. It moves the wheels there and locks them in place. And in AWS mode it''s just the opposite, the controller knows that the wheels have to be allowed to turn to accomplish whatever steering the operator is trying to do."