For keeping the metallic stuff intact and best working condition, it is very important to use different types of coating techniques. Not only this, but these are also helpful to enhance the mechanical strength of the substance.
What is PTA welding and what makes it better than the traditional one?
Basically plasma transferred arc is a hardfacing technique that corresponds to the deposit of a high quality material that's metallurgical fused. This is done on low cost surfaces so that it would be very easy to achieve the features like mechanical strength, corrosion resistance.
The entire process of PTA makes it advantageous over the others. Let's discuss some of the advanced features:
* The process is easily automated and thus provides a high degree of reproducibility.
* The process allows precise metering of material i.e., powder. This means lesser quantity gets used as compared to the regular welding procedures.
* PTA also permits precise control of weld parameters.
* The results of this process produce the deposits that are tougher and the corrosion resistance is also improved in this method.
* This method results into some smooth deposits and thus the post welding machining also gets reduced.
What are the applications of PTA welding?
Right from the refining sector to the engine valves and power generation, PTA is used in all of the things. It fulfills the extreme demands of wear resistance. Under some higher stresses also, the coating never gets compromised.
PTA is all about a highly energetic plasma arc that melts the base material surface. At the same time, a powdery material used as filler is inserted and it also gets melted.
What is Metal Spray used for?
Well this term can be very well coordinated with thermal spraying of ceramics and other alloys to increase the resistance of the base material. The process is entirely different from welding and brazing. All these procedures are although done to add a layer on the surface, the technique is entirely different.
Metal spraying doesn't use any base material. For this procedure, the surface temperature needs to be set up to 300 degrees F. This is done with non compatible materials like:
* Metal with dissimilar alloy
* Metal with carbide
* Metal with ceramic
* Wood with a metal, and so on.
The forms of energy used to melt the material are combustion gases, plasma flame, electric arc, etc. It is created using a thermal spray torch and these are designed to be hand held or else can also be mounted on some machine.
The sources of material that can be used in the procedure come in two different forms, i.e., a wire or powder. There are several post spray operations also held like sealing of the surface and heat treating. These decide the characteristics of the material after Metal Spray. So these are very important ones.
All such procedures are done to enhance the features and life of the structures and to prevent environmental effects.
