Deposition techniques

Powder welding troubleshooting

Problems with your powder welding process?

Problem Cause Solution
Deposit peels off 1. Poor preparation of the surface (oxidized or dirty surface)
2. Required surface roughness is >Ra 5
3. Too low preheating temperature
4. Too high preheating temperature
5. Too high content of S & Ti in the cast iron base

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. Poor sealing in the torch
4. Incorrect particle distribution for the torch
5. Incorrect work method with the weld pool
6. Cast iron base contains inclusions

Clean the surface well
Sand blast well
Adjust parameters
Replace seals

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Technical area: Surface coating
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Atmospheric plasma spraying (APS) powders
Powder welding products
Thermal surfacing
Learn more about surface coating, applications and deposition techniques
Technical Papers: written and peer-reviewed by experts in surface coating