Risorse professionali

Will commercial grades of copper become hard (like steel) if they are cooled rapidly after heating?

No. Copper is not susceptible to precipitation hardening.

With respect to the MOD Defence Standard 02-879 Part 2 Forgings, what do the terms Class 1, Class 2, Class 3 and Class 4 mean?
  • Class 1 is a forging whose failure would lead to uncontrollable flooding, the total immobilisation of the vessel or serious harm to personnel.(e.g. First Level systems in submarines).
  • Class 2 is a forging whose failure would lead to severe but controllable flooding, the serious disruption of weapon systems, main propulsion machinery, or its attendant auxillaries, including generators
  • Class 3 is a forging whose failure does not constitute an immediate, significant hazard.
  • Class 4 is a forging which is used for forging stock only.
What kind of cleaning do copper alloy cages require?

On average, copper alloy cages must be cleaned approximately once or twice a year, which is significantly fewer than traditional cages, over a service life.

Are small diameter tubes necessary for increasing the energy efficiency of air conditioners?

No. The system energy efficiency can also be achieved with conventional tubes (such as 3/8 inch diameter tubes) simply by using more tubes and thereby increasing the surface area available for heat transfer. Nevertheless, a penalty is paid in terms of the increased weight of tube material and fin material as well as increased refrigerant volume. In general, if larger diameter tubes are used then a larger coil size is necessary to achieve the same performance and energy efficiency that could be achieved in a more compact system with smaller diameter tubes.

Are the 1, 2 and 5 Cent Euro coins pure copper?

No, they are made from steel coated with a thin layer of copper.

Are weld repairs permissible on Class1 and Class 2 Forgings produced to Def Stan 02-879 Part 2?

The rectification of defects by welding is not permitted on Class 1 and Class 2 forgings.

Can chrome plated copper tube be formed into a bend?

Yes, with care and the correct procedure.

Can copper alloys be used for architecture?

Yes, brass and bronze alloys are available.

Can leaded solders be used on drinking water installations?

No.

Can patination of the copper be prevented?

Applying a lacquer is not recommended, particularly when large areas are considered. Lacquers will require regular maintenance over the life of the roof.

Che differenza c’è tra il tubo delle batterie di scambio e quello per gli allacciamenti?

Esistono due tipi di tubi di rame per gli impianti di refrigerazione e condizionamento: quelli usati all’interno delle batterie di scambio termico e quelli usati per allacciare l’apparecchio al compressore.
Il primo tipo deve rispondere alle caratteristiche indicate dalla EN 12735-2 mentre il secondo tipo dalla EN 12375-1.
Entrambi hanno la stessa composizione chimica ( definita come Cu-DHP); ma, a parte questo, vi sono molte differenze importanti.
I tubi per le batterie sono sostanzialmente forniti solo allo stato ricotto, possono avere uno spessore notevolmente minore (sono forniti a partire da 0,28 mm, contro gli 0,80 mm minimo dell‘allacciamento). Inoltre devono avere tolleranze dimensionali più severe, sia per lo spessore che per il diametro esterno.
Quelli per l’allacciamento hanno una quantità di diametri esterni più elevata, ma hanno meno spessori; sono forniti anche allo stato duro e semi-duro.

Che tipo di bronzo viene utilizzato per le opere d'arte moderna?

Il bronzo è stato usato per secoli per creare statue, ed è ancora la prima scelta per le opere di arte moderne. Le leghe più utilizzate per questi oggetti sono i “gunmetals”, come CC492K e CC491K.