Industry News
Plasma Transfer Arc (PTA) Applications
Abstract: Plasma arc welding (PTA) is a heat treatment process that applies wear and corrosion resistant layers to the surface of metallic materials. A high-energy plasma arc melts the surface of the base material. At the same time, powdered filler material is introduced into the arc and melted. During the polymerisation process, a substance-to-substance bond is formed between the filler material and the base material.
Keywords: plasma transfer arc overlays (PTA)
Process
Plasma Arc Cladding (PTA) is a welding process that creates a metallurgical bond to the base material and is applicable to most alloys. PTA can be performed in a fully automated mode so that once the parameters are set for a particular design, the end result is the same for all parts.
General operating range
Cladding speed: 2 to 12 kg/hour
Cladding thickness: 1 to 6 mm
Cladding hardness: up to 60 HRC
Advantages
Suitable for use with automatics
Thickness from 1mm to 6mm
Our company has recently introduced this new equipment, through many experiments and operations we have overcome the problems associated with this process. Now we are sharing it with you.
| Questions | Justification | Solution |
| Removing the cladding | 1. Insufficient surface preparation (oxidized or dirty surface) 2. Preheating temperature too low 3. Poor connection due to incorrect parameters/welding current too low | Clean the surface thoroughly Perform a good sandblasting Increase the preheating temperature Increase the current |
| Crackle | 1. Too much dilution due to overheating/too much welding current 2. Cooling too fast 3. Critical substrate | Reduce welding current Reduce cooling rate Slow cooling/controlled cooling Use a buffer layer |
| Porous | 1. Insufficient surface preparation 2. Incorrect parameters (welding current, upslope welding, downslope welding) 3. Dampness due to poor sealing, etc. | Clean the surface thoroughly Perform a quality sand blast Adjust the parameters Replace the seals Flush the equipment with argon gas |
| Clogging | 1. Inappropriate particle size 2. Non-spherical particles in the powder used | Reduction of fine particles Powder replacement |
This process is ideal for automated coating of exhaust valves in large volumes. The dilution of the substrate metal is negligible and can be used with a variety of consumables.
Over the past decade, our company has improved and improved in many ways in terms of enterprise scale, human resources, level of technical equipment, and testing and inspection facilities, and is constantly making new developments. Our team has the experience and attitude to provide quality services, so you can rest assured that only parts that meet our strict quality control standards will make it to your country. And substandard parts will stay in the workshop forever!