T E C N O - S A L D A T U R E | industrial robotic welding

WELDING | PTA WELDING

In the plasma welding PTA (Plasma Transfer Arc) has used the torch in the middle of it the tungsten electrode, which is infusible in the process. Around the electrode reaches a gas plasmogenico that, in the presence of the electric field present externally or internally to the torch, it becomes plasma, which is highly ionized gas. The key feature is that plasma can capture an enormous amount of heat and carry it on the cast to cast. A necessary condition for this to occur is that the plasma has to come in concentrated form to the piece, something made possible by using a suitable distance from the workpiece and a rate of leakage of gas high enough. In these applications, the temperature can reach, in more severe cases, in order of magnitude of 20.000 ° C, something unthinkable for other welding operations: it is precisely this high temperature responsible for high precision and speed of implementation of these operations. To prevent blowholes in the welded around the torch using a system that allows the issuance of special gas (usually mixtures of noble gases) that had almost no solubility at high temperatures, do not give way to atmospheric gases to penetrate the metal bath zone. The plasma welding process can be dedicated to sheet metal by melting points. The concentrated energy of the plasma arc restricted in its application, the distortions of sheet metal. In some cases the points of fusion welding may be partially overlapped to form the joints tight.

Advantages of plasma welding PTA
Minor distortion of the surface of the workpiece, including sheet metal;

Superior quality of the weld pool;

Streamline welding;

Absence of blowholes and weather in the bath of molten metal;

Ability to obtain tight joints;