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This die becomes shorter and wider until it can never expand anymore due to container wall restriction. That’s when the aluminum material starts forcing its way out through the die’s orifice and form a particular profile.

Speaking from personal experience as a welder, steel is a lot easier to work with than iron. If someone manages to break a piece of steel (which isn’t easy), repairing it is a simple matter of properly positioning the pieces and welding them together. In contrast, repairing a cracked or damaged piece of iron means heating the whole piece back up to nearly molten temperatures, then carefully welding it in stages--with pauses to reheat the piece--while sometimes giving it a whack with a hammer and hoping you don’t hear the tell-tale ping of a crack forming somewhere else. Iron is a finicky material.

The Functionality of Sliding Door Runner Wheels