UPR-2.4S «Strizh» Air-plasma gouging

Plasma-arc planing is a method of metal removal by the plasma jet. This method is characterized by a high productivity, efficiency and safety for the environment.

In comparison with the traditional arc-air planing by carbon electrode and mechanical processing techniques, the plasma-arc planing provides:

• High productivity of metal removal;
• Reduction of energy consumption;
• Easy handling;
• Clear visibility of the working area;
• Reduced noise during the work;
• Reduced smoke formation;
• Lack of the material carburization;
• Work with any metal (including high-alloyed metals and aluminium);
• Minimization of the subsequent cleanup.

Process technique

Specialized plasma torch is turned cornerwise in the direction of movement by 35-45 degrees. Operator moves the torch, directing the plasma flow which partially penetrates the metal thickness and removes metal from the surface, without producing a burn-through. Plasma arc current intensity, torch relocation speed, distance from the nozzle to the metal surface, slope angle of the torch and tip size determine the metal removal productivity and section profile of the produced plane (groove).

Process variables

GASES IN USE
The most commonly used gas for the plasma planing is the air. It is available, and it provides a good quality during the planing of low-carbon steel and cast iron.

NOZZLE CHOICE
The depth and width of the forming groove depend on the nozzle hole diameter. The smaller the hole, the deeper the groove.

PLASMA ARC CURRENT
Adjusting the current intensity, the cutter also controls the arc diameter and groove width from the planing.

PLASMA ARC LENGTH
The farther the nozzle from the metal, the greater the width and the smaller the depth of the groove. The closer the nozzle the deeper the groove.

PLANING SPEED
Torch relocation speed makes it possible to regulate the depth and the width of the groove. The high relocation speed will provide a shallow groove regardless of the nozzle size. When the movement slows down, the groove increases and becomes much deeper.

SLOPE ANGLE OF PLASMATRON
The slope angle of plasmatron is very important for planing productivity regulation. Narrow slope angle will remove a small amount of metal. As the angle increases, the groove becomes wider and deeper. If the lead angle is too large, typically 50 degrees or more, the molten metal will be ejected back onto the plasmatron nozzle. Optimal plasmatron slope angle is equal to 35 degrees.