A Metal spray gun use for the thermal coating process in this we use a single wire, cord, and powder for coating. This feed material melt in an oxygen fuel gas flame or with the help of an electric arc. This molten metal atomizes by compressed air and impinges on the surface of the substrate.
For melting the coating material both flame and electric arc process used. In the electric arc process of a metal spray gun, the arc generates between the cathode and anode. In metalizing gun coating material having opposite polarity use. In the electric arc process, two methods used to forward the coating wire. One is an air drive and the other is an electric arc drive. In the air drive, compressed air uses to forward the wire, and in the electric drive, a motor used to forward the wire which connected to the electric panel.
In the flame, type compressed air use with oxygen and acetylene gas to melt the coating material. In thermal spray gun LPG gas also used sometimes at the place of acetylene with oxygen.
There are three operating controls in the Metal Gun:
1. The gas head valve controls the flow of gases air in both the gas head and the drive turbine.
2. The speed control rings adjust the rate of wire feed.
3. The wire valve thumb-slide (trigger) causes the drive rolls to grip or release the wire.
Suggestions-Flame Spray Gun