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Laser cladding is performed by melting a pre-placed powder onto a substrate to ensure a bond with minimal dilution, nominal melting and a small heat affected zone.The laser used in the experiment was the Nuvonyx ISL-4000L laser mounted on a Panasonic VR-16 robot.The HPDDL used in this feasibility study employs 4 stacks of 20 bars, which are brought to a line by a single macro lens [Figure 1].
The light emitted at the facet of the laser diode is highly divergent and astigmatic.
To make this usable, a lenslet array is close coupled to a two dimensional array of laser diodes.
The use of binders often leads to porosity due to the evaporation of volatiles during the cladding pass.
The HPDDL system does not necessitate the use of binders to hold the powder together before a cladding pass.
A high energy laser beam creates an intense heat input and thus alloys are bonded to the surface with a low degree of dilution ( Expert know-how in materials, surface welding and flame spraying processes and customer applications make our four technology centres an exclusive resource in your work to optimise existing applications and develop new business opportunities.
A high power direct diode laser [HPDDL] and its unique beam make for a highly efficient tool to use in cladding operations.
Laser cladding and alloying are traditionally distinguished by the relative amounts of the consumable material added and substrate melted.
Generally the two categories are arbitrarily separated by their relative amount of dilution, laser alloying being classified as having greater than 10% dilution, laser cladding having less than 10% dilution.
SEM analysis is a true, accurate measure of the dilution, or intermixing of the clad and substrate.
Laser alloying is a process that is often grouped with laser cladding operations.