Deposition techniques
Plasma Transferred Arc (PTA)
Ideal for high unit volume automated applications, such as thermal surfacing of exhaust valves, this technique offers low base metal dilution and can be used with a wide range of consumables.
Process
PTA (Plasma Transferred Arc) is a welding method, thus it enables a metallurgical bonding with the base material. It can be used on most alloys.
PTA can be fully automated and thus once the parameters are fixed for a certain design, consistent final results are achieved for all pieces.
Typical working range
- Deposition rate: 2-12 kg/hour
- Deposition thickness: 1 - 6 mm
- Deposition hardness: up to 60 HRC
Benefits
- Suitable for automation
- 1-6 mm thickness
Problems with your PTA process?
PTA troubleshooting
| Problem | Cause | Solution |
| Deposit peels off |
1. Poor preparation of the surface (oxidized or dirty surface) |
Clean the surface well |
| Cracks |
1. Overheating / too high welding current resulting in too high dilution |
Reduce welding current |
| Porosity |
1. Poor preparation of the surface |
Clean the surface well |
| Clogging |
1. Incorrect particle size |
Reduce fines content |
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