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Waterjet removes plasma sprayed coatings
A
KMT Waterjet Systems product story
Edited by the Manufacturingtalk editorial team
Dec 15, 2003
As part of the restoration and repair of gas turbine jet engine components a high pressure water jet system is stripping coatings from turbine components without affecting base metals.
As part of the restoration and repair of gas turbine jet engine components undertaken by Wood Group Component Repair, coatings need to be stripped from turbine components prior to re-application.
In order to refine the coating removal process, Wood Group is currently carrying out development work using a KMT waterjet system.
This significantly speeds up the process without affecting the base material.
Hundreds of different coatings are applied to the turbine component parts by plasma arc deposition - mainly on to casings and seal areas where the ceramic or other coating is intended to wear in preference to the mating part.
At present the plasma sprayed coatings are removed by conventional machining, acid bath and grit blasting.
This is a very time consuming operation and some of the base material is removed during the operation.
These problems are eliminated by the waterjet process comprising of a KMT Waterjet Systems Streamline SL IV 50HP pump that produces 3,800bar (55,000 lb/in2) working pressure.
It utilises a Rotojet rotating cleaning nozzle with a fully adjustable rotational speed of up to 400 rpm.
This process safely removes the plasma layer and nickel-based bonding coat without putting the substrate at risk, at the same time eliminating any danger of contamination.
CNC controlled, the 5-axis machine is able to cope with components over 1 metre in diameter, the operator only being required to select the relevant programme for the component.
The Rotojet head then follows a predetermined path to remove effectively and safely all the old coating.
Senior Development Engineer at Wood Group Component Repair is Peter Stevenson who outlined the benefits of the new system: "In addition to the environmental benefit of not using acids, the KMT waterjet process doesn't put the substrate at any risk.
It also does away with any contamination problems as it is significantly faster".
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