Simple to use

2 steps: deposit and fusing
0,1-3 mm thickness
cylindrical parts
smoother surface than wire

The flame spray process consists of two steps: firstly, apply powder by spraying with the gun, and secondly, fusing the deposit with a fusing torch. The powder is fed into an oxy-acetylene or oxy-hydrogen gun by injection. This is projected towards the base material at high speed. The hot particles flatten upon impact and interlock both with the base material and each other thus forming a mechanical bond. 
This is followed by a fusion treatment to obtain a dense and well-bonded coating of the surface layer. The applied spray coating is heated to a temperature between the solidus and liquidus temperature - arround 1000°C. The material is a mixture of melt and solid particles at the optimum temperature.

Shrinkage of 15 - 20 % occurs during fusing when the melt fills the gaps between the particles. 

Deposition rate 1-9 kg/hour

Deposition thickness 0,1 - 3 mm

Hardness  38 - 61 HRC