Spray & Fuse

With the aid of expanding combustion gases, a powdered spray additive is fused onto the prepared workpiece surface in an acetylene-oxygen flame. If necessary, an additional gas such as argon or nitrogen can be used to accelerate the powder particles.

A distinction is made between self-flowing and self-adhesive powders. Self-flowing powders generally require thermal post-treatment. This “melting process” is mainly carried out using acetylene-oxygen torches.

Advantages:

• Wide variety of spray materials
• The coating system is gas- and liquid-tight
• Pore-free layers
• Good wear resistance under linear, point and surface loads
• Very high adhesive strength
• Metallurgical bond to the base material
• Very good post-processing of the layer by turning, milling, grinding and lapping
• Good corrosion resistance to alkalis, weak acids, and aqueous solutions

Disadvantages:

• Cannot be applied partially
• Chrome steels are not suitable for fusion bonding
• High temperature load on the base material
• Limited component geometry

Layer thickness: 0.3–0.8 mm
Layer adhesion: good through diffusion
Temperature load: very high, up to 1150 °C
Base materials: CrNi/duplex steel, Ni-based alloy
Machining: turning, grinding, lapping of layers possible

Production capacities

Max. length	Max. diameter	Max. weight
550 mm	800 mm	250 kg