Laser cladding

Lasercladding (laser welding) strongly resembles traditional welding of metals. The outcome, however, is metallurgically more related to flame sprayed and then fused coatings. The result of which is a metallurgic connection of the coating to the substrate. When applied correctly the dilution zone is very small. Also the heat-affected-zone, similar to the area around traditional welds, is small. However, it may still affect the coating quality.

Lasser cladding2

A wide array of coating materials can be chosen to pair with the substrate. The pairing is very precarious. Small differences in composition of either the coating material and the substrate material can have detrimental effects on the coating quality. An analysis of the substrate is almost always mandatory. The quickest fix is to choose a coating material that is identical to the substrate.

Proces features

Laser processes form a controled welded joint of the coating material to the substrate with only minimal dilution between substrate and coating material. The process is completely automated.

Characteristics

  • Good bonding through weld joint
  • Hard coating materials cannot (yet) be applied without micro-cracks
  • Coating thickness of approx. 1mm necessary leading to high costs
  • Contamination and surface failures (cracks / porosity) of the substrate can induce coating errors

Typical coatings

  • Repair substrate with identical material
  • Inconel/hastelloy alloys
  • Stellite (wear protection layer)*

*possibility of microcracks, so corrosion resistance is moderate

Applications

  • Valves and seats
  • Wear (protection) layers
  • Drill bits for Oil & Gas

Maximum capacity laser cladding:

  1. Maximum diameter:      Ø1,600 mm
  2. Maximum length:          3,850 mm with tail stock
                                        4,650 mm with steady rest
  3. Maximum weight:         8,000 kgs (8 tons)

 

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