ELECTRIC ARC SPRAY - ELECTRIC ARC:
During the electric arc spray is the added material melted while coming into the spray gun as two wires. The compressed air flow accelerates the melted material and sprays it on the prepared surface of machine part. Added material wires can be either from the same material or different composition. Using nitrogen or argon can reduce the oxidation of such surface.
Basic parameters of spray:
| Particles velocity [m.s-1] |
Adhesion [MPa] |
Oxygen content [%] |
Porosity [%] |
Spraying output [kg.h-1] |
Typical spraying thickness [mm] |
|---|---|---|---|---|---|
| < 100 | 10 ÷ 30 | 10 ÷ 20 | 5 ÷ 10 | 6 ÷ 60 | 0,2 ÷ 10 |
- Added material - Wire No. 1
- Added material - Wire No. 2 (same or different as wire No. 1)
- Background
- Surface
| Advantages | Disadvantages |
|---|---|
| Efficient spray method | Added material must be electrically conductive |
| The lowest prices of added materials | Higher porosity in the spray surface (ca 20%) |
| Broad range of added materials (also can be used welding materials) | Lower cohesion with the basic material (can be limited by so called interlayer) |
| Simple spray of great areas (hand spray) |
Our company uses JP-9000 equipment of American company Praxair TAFA. Positioner with automatic feed allows very accurately surface cylindrical and spherical surfaces up to 1100mm diameter and 3500mm length.