Deposition techniques

PTA troubleshooting

Problems with your PTA process?

Problem Cause Solution
Deposit peels off

1. Poor preparation of the surface (oxidized or dirty surface)
2. Too low preheating temperature
3. Wrong parameters / too low welding current resulting in bad bonding

Clean the surface well
Sand blast well
Increase preheat
Increase current

Cracks

1. Overheating / too high welding current resulting in too high dilution
2. Too fast cooling

3. Critical base material

Reduce welding current
Reduce cooling speed
Slow cooling / controlled cooling
Use buffer layer

Porosity

1. Poor preparation of the surface

2. Incorrect parameters (welding current, up-slope, down-slope)
3. Humidity due to e.g. poor sealing

Clean the surface well
Sand blast well
Adjust parameters
Replace seals
Flushing equipment with argon

Clogging

1. Incorrect particle size
2. Non-spherical particles in the powder used

Reduce fines content
Replace the powder

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