Principles of Coating Technology
Principles of Coating Technology
Principles of Coating Technology
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GFE Schmalkalden e.V. Build-up welding<br />
Requirements for the build-up welding<br />
• Low dilution<br />
• Homogenous microstructure<br />
• Homogeneous weld penetration<br />
• Low roughness<br />
Criteria for the build-up weld material<br />
• Operational demands<br />
• Weldability<br />
• Availability<br />
<strong>Principles</strong> <strong>of</strong> <strong>Coating</strong> <strong>Technology</strong> II<br />
• Uniform coating thickness<br />
• Homogenous coating composition<br />
• Preferable smooth surface<br />
• Without penetration cuts<br />
• Metallurgical interaction between substrate and welding material<br />
• Resulting requirements on the welding method<br />
Heat treatment /pre treatment<br />
• Heat treatment<br />
• Dilution sensibility<br />
• Heat treatment before welding to reduce thermal stresses<br />
• Slow cooling after welding to reduce thermal stresses<br />
• Regarding dispersion kinetics to avoid unwanted mechanical and corrosive<br />
properties and phases<br />
GFE Schmalkalden e.V. Build-up welding<br />
Criteria for the build-up weld method<br />
• Process stability<br />
• Availability<br />
• <strong>Coating</strong> quality (dilution, thickness, roughness)<br />
Quality <strong>of</strong> build-up welded coatings<br />
Welding defects: pores and non<br />
diluted particles<br />
Ideal welding:<br />
<strong>Principles</strong> <strong>of</strong> <strong>Coating</strong> <strong>Technology</strong> II<br />
Ideal welding<br />
• Post treatment possibilities<br />
• Component geometry<br />
• Cost effectiveness<br />
• Low dilution<br />
• Small heat affected zone<br />
• Homogeneous carbide distribution<br />
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