Laser Technology / Why ?

Metal cladding through laser :

- presents the advantage of a welded joint (highly resistant against mechanical stresses)
- gives the opportunity to add metallic powders specifically made to the requested purpose (large choice of metallurgy)
- transfers a very restricted amount of heat , due to the very intense but focalized laser beam (dimensional integrity of the cladded items)
- gives the opportunity to add a very thin layer of cladding with the requested metallurgical characteristics immediately available because of a very low dilution rate.

Coating process
Thermal spraying (HVOF, Plasma, Gun, Cold spray,...) Traditional welding (TIG, MIG, MAG, PTA, Open arc, …) Diod laser cladding
Heat sorce Combustion flame, electric or plasma arc Arc, plasma Infrared beam
Bond strength Low: mechanical bonding High: metallurgical bonding High: metallurgic bonding
Coating structure Lamellar; from porous to dense (*) Dense -cracks and pores may exist (*) Dense - no porosity
Process reproductibility High Low Very high
Heat input to the substract Very low to moderate (*) Very high Low
Substract deformation Nil to low High Nil to low
Dilution Nil Moderate to high ('buttering' layer) Low (<5%)
Coating thickness 0,05 to 1 mm 1mm to cm Between 0,5 et 2 mm per layer; several mm
Coating nature Large choice of metal matrix, alloys, ceramics, polymers and hardfacing alloys Metal, alloys, Hard alloys, alloys with hard particles Metal, alloys, Hard alloys, alloys with hard particles including diamond
(*) Depends on the type of proces

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