Principles of Coating Technology

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GFE Schmalkalden e.V. Thermal spraying Advantages and Disadvantages of thermal Spray processes Problematic coatings on edges Different coating thickness due different impact angles of the sprayed particles Principles of Coating Technology II GFE Schmalkalden e.V. Principles of Coating Technology II 9. Build-up welding 23 24 12
GFE Schmalkalden e.V. Build-up welding • Generation of an connection between a metallic substrate and the plating material • Deposition welding occur, if the joining partners are remelted and alloyed in the interface area • Deposition welding is possible, if both materials (substrate and weld metal are suitable for welding (mixing without formation of intermetallic phases is possible) Flame with weld powder pendeling Example: gas build up welding Principles of Coating Technology II Powder feeder GFE Schmalkalden e.V. acetylen cooling Weld direction oxygen For generation of coatings energy input is necessary • for surface activation is not possible • To partial or fully melt the substrate and the weld material • To alloying within the contact area Energy input by • Heating (thermal activation) • Radiation • Elastic-plastic deformation (mechanical activation) All welding methods can be used for build-up welding Best methods are welding methods with • high deposition rates • low dilution between substrate and weld material Principles of Coating Technology II 25 Build-up welding 26 13
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Principles of Coating Technology

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