Monthly Archives: June 2020

Laser Cladding Technology | Laser Cladding Process | Laser Cladding Applications | Laser Welding | Laser Cutting | Laser Cladding Repair Services

   01-laser cladding-laser cladding process-laser cladding technologies-thermal spray coating-co2 laser-nd yag laser-tungsten carbide hardfacing powder 

Laser Cladding is the process wherein the metal (powder/wire) is deposited on to another metal using a laser as heat source. It’s an alternative to traditional welding and thermal spray.

01-coaxial-nozzle-weld head-laser head-homogeneous powder flow-consistant powder flow-low maintenance weld nozzle

This technology is similar to thermal spray in that it has an energy source to melt the feed stock that is being applied to a substrate. Where it differs is that it uses a concentrated laser beam as the heat source and it melts the substrate that the feed stock is being applied to. This results in a metallurgical bond that has superior bond strength over thermal spray. Additionally the resulting coating is 100% dense with no voids or porosity.

Working of Laser Cladding:

01-schematic diagram of Laser_Cladding_System_setup

The basic system is made up of a laser to generate the beam, a set of optics to direct and focus the beam, a powder feeder, and a part manipulator. The laser and optics stay stationary and the part is moved in relationship to the laser. The laser cladding systems are fully automated providing precise control of the coating (cladding) process.

01-laser cladding process-shaft with damaged ceramic coating-clad-application-ceramic

02-laser cladding process-shaft after ceramic coating has been removed and laser cladding has begun-clad-application-ceramic

03-laser cladding process-shaft being finish ground in house-crack free part-clad-application-ceramic

Advantages:

  • One of the advantages of the laser cladding process is the concentrated beam of energy from the laser. It can be focused and concentrated to a very small area and keeps the heat effected zone of the substrate very shallow. This minimizes the chance of cracking, distorting, or changing the metallurgy of the substrate. Additionally the lower total heat minimizes the dilution of the coating with material from the substrate.
  • Coating thicknesses can reach .125" (3.1mm) with carbides in one pass and can go to any thickness with other materials and multiple passes.
  • Because the feed stock is a powder, so there is a large variety of materials available including pure metals, alloys, or carbides. Further the development extensively with Inconel and Stellite alloys on a wide assortment of oil field applications.

Applications:

  • Optimal Part Design by Dissimilar Metal Deposition
  • Ideal for Repair & Restoration
  • Material Research & Development
  • Wear Resistance & Fatigue Life Improvements
Laser Cladding Technology

Originally posted 2011-04-24 23:29:13.

Carbon Fibre Reinforced Plastics | Carbon Fibre Reinforced Polymers Use | CFRP Applications

01-carbon fibre composites-low weight-stronger-gorilla-carbon-fibre-iphone-case     

The Composite’s properties are mainly influenced by the choice of fibers. Three types of fibres are Glass fibre, Carbon fibre, Aramid fibre. All fibres have generally higher stress capacity than ordinary steel and are linear elastic until failure. The most important properties that differ between the fibre types are stiffness and tensile strain.

Carbon Fibre Properties:

  • High Modulus of Elasticity 200 – 800 GPa.
  • Tensile Strength 2500 – 6000 MPa.
  • Density 1750 – 1950 Kg / m3.
  • Ultimate Elongation 0.3 – 2.5 %.
  • Carbon fibres do not absorb water.
  • Carbon fibres are resistant to many chemical solutions.
  • Carbon fibres withstand fatigue excellently.
  • Carbon fibres do not show any creep or relaxation.
  • Carbon fibre is electrically conductive.

Composites:

01-unidirectional - carbon composite - bidirectional carbon composites-graphite metal foams-woven, bonded carbon composites

When the fibre and the matrix are combined into a new material it becomes a composite. The fibres may be placed in one direction in the composites and then the composite is unidirectional. However fibres may also be woven or bonded in many directions and the composite becomes bi or multi directional.

Composite Manufacturing:

01-hand lay up composite manufacturing-composite tooling production-prepreg material-unidirectional woven cloth-wet lay process-cured at room temperature

  • Hand lay up method
  • Pultrusion method
  • Filament winding
  • Moulding

01-pultrusion-carbon composite production methods

Carbon Fibre Reinforced Polymers (CFRP):

01-carbon fibre reinforced polymers-carbon fibre reinforced plastics-CFRP-CRP-carbon fibre in automobiles

CFRP is sometimes referred to as Carbon Fibre Reinforced Plastic is similar to fibre glass. Carbon fibre is woven into a textile material and resin such as epoxy resin is applied and allowed to cure. The resulting material that is very strong as it has the best strength to weight ratio of all construction materials. It is an improvement on glass fibre reinforced plastic, although much more expensive.

Carbon Composite (CFRP) Friction Bearings:

01-carbon_composite friction bearings-carbon fibre reinforced polymers-cfrp

Friction bearings commonly use lubricating oil to separate the moving component from the mated non-moving bearing surface. Friction bearing surfaces commonly consist of a material that is softer than the supported component.

These friction bearings provide excellent dry running characteristics and can be used in operation after lubrication system failure making them an ideal solution for use in pumps and construction machinery as well as in mechanical engineering and shipbuilding or in offshore and onshore facilities to reduce maintenance and increase reliability. It can withstand up to 260 degree Celsius.

Originally posted 2011-04-24 20:57:12.