R - Aluminium glossary

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Rapid Prototyping

Rapid Prototyping, also known as Generative processes, is a forming and processing technology which increases the speed in manufacturing prototypes...

Recasting

Remelting is the production of secondary aluminium by melting down scrap in special furnaces.

Recovery

Recovery is a softening process. The reduction in strength occurs without any noticeable changes in the structure. There is merely a displacement of...

Recrystallisation

Recrystallisation means complete softening of a metal. In a structure that is heavily deformed by cold working, such as rolling or cold impact...

Recultivation

‘Recultivation’ is the term used to describe the process whereby an area of land that has been used for industrial purposes or opencast mining is...

Recycling

Recycling is the reuse of used material in order to manufacture new products. Further information on the recycling of aluminium

Red mud

Red mud is a residue that is produced in large quantities during the extraction of alumina from bauxite; it comprises mainly iron oxides and other...

Refined aluminium

Refined aluminium has a purity of more than 99.9wt% (i.e. even higher than that of unalloyed aluminium). The electric conductivity is at its highest...

Refined aluminium alloy

Refining is a process step that is carried out after remelting when the quality of the molten aluminium demands it. It involves cleaning up the melt...

Remaining melt

When molten metal solidifies, the so-called ‘remaining melt’, which contains large amounts of alloying elements, is forced to the grain boundaries of...

Remelting ingots

Aluminium is cast into ingots for subsequent remelting and further processing. Remelting ingots, rolling ingots and extrusion billets can be produced...

Replicast-process

The Replicast process is a combination of investment casting and lost-foam casting. First, as with investment casting, a model is dipped into a...

Resistance welding

Resistance welding is a welding process in which an electric current is passed through the parts to be joined. The resistance of the metal causes...

Reverberatory furnaces

Reverberatory furnaces have a flat hearth that can be tilted. The molten metal is heated from above, which allows for a high throughput. This process...

Risers

Risers are used in various casting processes as part of the casting system. They ensure that metal flows into those parts of the mould where cavities...

Rivet nuts and bolts

Rivet nuts and bolts are threaded fasteners that function as a solid, blind or punch rivet on the one side and on the other as a nut or bolt for...

Riveting

Riveting is the oldest joining technique of all and is still used today in aluminium processing; the most important riveting techniques are solid...

Roll stand

Rolling is carried out using so-called roll stands, which can have two or four rolls arranged on top of each other. The whole process is carried out...

Roll-bonded sheet

Rolling two sheets together under high pressure produces roll-bonded sheet. Certain areas are deliberately not bonded together, however, and these...

Rolling

Rolling is used to process aluminium ingots and strip to strip, sheet and foil. One differentiates between hot rolling (with large ingots heated to...

Rolling ingot

Rolling ingots are the starting point for rolled products. They are cast ingots that are rectangular in cross-section; their dimensions range from...

Rolling pass

In metal rolling, a ‘pass’ is the passage in one direction of the metal being deformed between the rolls. Further information on rolling

Rotary drum furnaces

Rotary drum furnaces are mostly used for recasting of scrap. As the name implies, this type of furnace comprises a drum that slowly rotates about its...