blastroom

A flame spray gun consists of a nozzle in which a combination of oxygen and fuel like acetylene, propane, or hydrogen is injected. The gas mixture is combusted in the front of the nozzle to make a flame external to the nozzle. Counting on the ratio of oxygen to fuel, the temperature of the flame ranges between 3000 and 3300°C. The selection of the nozzle design depends on the coating material, which may be in the form of either powder or wire. Powder Flame Spray Gun A cold air cover is used to collimate the flame to regulate the spray pattern. In the powder feed system, the coating material is gravity fed to the gun from a sand blasting hopper. The powder particles melt during the transition through the flame and deposit on the substrate. Within the wire feed system, the wire tip is continually fed into the flame by a roller drive mechanism. The molten material at the tip of the wire is fragmented and propelled to the substrate by compressed gas injection. The wire diameter and...

Flame spraying uses flame spray gun for coating. A thermal spray process variation in which the controlled explosion of a mixture of fuel gas, oxygen, and the powdered coating material is utilized to melt and propel the material to the work piece. A flame spray gun involves blowing a plastic powder through a flame that partially melts the powder and fuses it because it contacts the substrate. It includes low-velocity thermal spray powder, red, and wire flame processes, and high-velocity processes. A flame spray gun involves blowing a plastic powder through a flame that partially melts the powder and fuses it because it contacts the substrate. It includes low-velocity thermal spray powder, red, and wire flame processes, and high-velocity processes. The part's surface is preheated with the flame. The standard approach is to coat only a few square meters at a time, so the temperature can be controlled. The flame is then adjusted. When the coating is completed, the powder is shut o...