Understanding the PTA Welding Process

PTA welding is also known as Plasma Transferred Arc welding. In this method fused metallurgical deposits of high quality are deposited on relatively less expensive surfaces.This technique is predominantly used to deposit carbide composites,medium and high density materials and soft alloys on different kinds of substrates in order to achieve different properties that include resistance to wear and corrosion, mechanical strength.

The Benefits of PTA

PTA hardfacing offers a number of advantages over other traditional welding methods like GTAW or gas tungsten arc welding and Oxyfuel or OFW. Let us understand what the PTA process offers. One of the major advantages with PTA is that it can be automated quickly thus enhancing its reproductive abilities. Further, it enables you to precisely meter the use of various materials being used. This results in low wastage and use of less material quantity in comparison to other welding methods. Likewise, it also enables you to control vital welding aspects like gas flow rates, voltage, powder feed rates, heat input and amperage so that there is a greater degree of consistency in completing a task. Further, the alloy deposits produced under PTA welding method is more tough and resistant to corrosion than under OFW or GTAW methods. Weld deposits are generally characterized by oxides and the low levels of inclusion. The other advantage with this process is that very smooth deposits thereby making sure that there is no need for more machine work once the welding is completed.

Know more about Thermal Spray

If you are planning to create a new dimension to your surface, then you should consider thermal spray. The principle of this technology is quite simple really. It involves feeding the semi molten or molten alloys, ceramics or any other filler material onto the work surface through a jet stream of air. Once these alloys encroach upon the work surface, they dispel the heat and cool down quickly. At the same time it builds up and blends into a highly cohesive structure. The resultant finish, when sprayed ranges in the 100 to 400 inches range. Polishing, grinding or finishing is based on your requirements. Values of less than 10 micro inches can be achieved quite easily.

Thermal Spray Application

Thermal spray can be applied on almost all kinds of materials like cermets which are a combination of ceramic and metal, ceramic, carbide and tungsten. It can also be applied on organic compounds such as polyester. Mechanical adhesion is a better option than metallurgical bonding. A grit blast helps in surface preparation and at the same time ensures proper bonding. You can enhance the tensile strength by using a viable high temperature processes like diffusion or micro welding, based on the type of material being used.

Make sure you opt for processes that transfer very little heat onto your work surface. At the same time take care that your work surface does not suffer from distortion or warping. Lastly, thermal spray technology is used in a variety of applications like plastics, chemical processing, molding, packaging, paper processing and food processing.

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