What is Wire flame spray gun and how does wire flame spray gun work?
The Process of Wire Flame Spray gun is essentially the spraying of molten metal* onto a surface to provide a coating. Material in the wire form is melted in a flame (oxy-acetylene flame most usual) and atomized using compressed air to form a fine spray. When the spray contacts the prepared component of substrate material, the fine molten droplets quickly solidify forming a coating. This flame spray process brought out correctly is called a “cold process” (relative to the substrate material being coated) as the substrate temperature can be kept low during processing avoiding damage, metallurgical changes, & distortion to the substrate component.
This flame spray process has been extensively utilized in the past and today for machine element work & anti-corrosion coatings.
Process Advantages:
Low capital investment
Simple to operate
Wire form cheaper than powder in wire flame spray gun
Deposit efficiency very high
Likely best for applying pure molybdenum coatings for wear resistance.
Portable system
Preheating facility built-in, unlike arc spraying
Likely to use system in areas without electricity supply
Common materials Sprayed:
Zinc & for anti-corrosion cathodic coatings on steel
Nickel/aluminum composite wire for bond coats & self-bonding coatings
Molybdenum for bond coats
Molybdenum for hard bearing applications, and excellent resistance to adhesive wear, used on piston rings, synchromesh cones & journals.
High Chromium steel for many applications requiring hard & wear-resistant coating
Bronzes, babbitt for bearing applications
Stainless steels, nickel, & Molybdenum for anti-corrosion and wear
Aluminum, nickel/aluminum for heat & oxidation resistance