Deposition techniques

Flame spraying troubleshooting

Problem	Cause	Solution
Deposit peels off	1. Poor preparation of the surface (oxidized or oily surface) 2. Required surface roughness is >Ra 5 3. Too low preheating temperature 4. Too high preheating temperature	Clean the surface well Sand blast well Preferable >Ra10 Increase preheat Decrease preheat
Cracks	1. Overheating 2. Too fast cooling 3. Hardened base material	Slower cooling / controlled cooling
Porosity	1. Poor preparation of the surface 2. Incorrect spray parameters 3. Incorrect spray distance 4. Poor sealings in the gun 5. Incorrect particle distribution for the gun 6. Too high oxygen level in the powder /oxidized powder 7. Powder contains hollow particles	Clean the surface well. Sand blast well. Adjust parameters Adjust distance Replace seals Choose the right parameter Adjust lambda Replace powder

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