Explosive cladding

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Explosive cladding is a blasting technical method wherein the explosive using explosives , an impression is produced of an object in a planar surface or two different metals are joined flat to one another. Fine and finest structures are such. B. feasible in copper plates or connections of otherwise difficult to represent material combinations possible.

Imaging process

The object to be depicted (e.g. an oak leaf) is placed on a deformable base (e.g. copper, ferritic steel , bronze , nickel , etc.). This is followed by a flat, non-deformable surface (e.g. glass ). The explosive is applied to the latter as an even, flat layer. The type of explosive (detonation speed, work capacity) and the degree of containment depend on the material being depicted, the properties of the object and the accuracy of the depiction. Usually explosives with detonation speeds of 2000 to 5000 m / s are used. The explosive charge is ignited either from the center above the object (accurate representation of the horizontal dimensions) or from the edge of at least two sides (exact representation of the underside structure). In addition to some special applications in electron microscopy , this process is only rarely used for the production of jewelry or fittings in mechanical engineering .

Sandwich process

The sandwich process is a process for the production of sandwich sheet metal panels or slightly curved panels with functional surfaces similar to the imaging process. Above all, expensive corrosion- and / or heat-resistant materials are applied in a thin layer to thicker, cheaper carbon steels (sheet metal) on one or both sides. The advantage is the physical, firm bond between the cladding partners without any structural changes and a pronounced metallurgical mixing and heat-affected zone, such as those found in e.g. B. occurs during plating by build-up welding. In addition, metals that are otherwise difficult to join, such as B. Connect aluminum with steel securely. Mainly used for the production of primary material for plant and apparatus engineering. The cracked cladding resists chemical corrosion and / or the effects of heat, the base material bears the mechanical loads.

literature

  • Karl-Helmut Tostmann: Corrosion. Causes and avoidance, Wiley VCH Verlag, Weinheim 2001, ISBN 3-527-30203-4 , pp. 206-208.
  • Friedrich Ostermann: Application technology aluminum. Springer Verlag, Berlin / Heidelberg 1998, ISBN 978-3-662-05789-6 , pp. 515, 516.
  • Günter Spur (Ed.): Handbook Heat Treatment and Coating. Carl Hanser Verlag, Munich 2015, ISBN 978-3-446-43003-7 , p. 235.

See also

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