Metal Spray Welding Process

This article throws light upon the four main steps involved in the process of metal spraying.

Metal spray welding process.

Dry compressed air atomizes the molten material and forms the coating. Spray transfer uses high voltage and amperage to produce an arc that is on at all times. Gas metal arc welding sometimes referred to by its subtypes metal inert gas welding or metal active gas welding is a welding process in which an electric arc forms between a consumable mig wire electrode and the workpiece metal which heats the workpiece metal causing them to melt and join. Spray arc welding is one of the processes used to transfer metal from the electrode or wire to the weld.

Thermal spray welding metalizing the spray process is an umbrella name for multiple processes. A constant voltage d. Spray transfer is ideal for use on thicker metals for butt or fillet joints. The heat from this arc melts the incoming wire which is then entrained in an air jet from the gun.

Welders use the spray transfer method for most mcaw procedures. Metal powder spray welding torch gun oxygen acetylene flame welder qh 2 h usa. Metallising materials and their selection 3. The tips of the wires meet melt and become molten.

These wires are then charged and an arc is generated between them. The molten metal is then atomised with compressed air to create a spray stream that applies the coating onto the surface being sprayed. Why apply arc spray coatings. Minute molten droplets of metal travel via the arc and on to the base metal or the joint being worked on.

Wire arc spray is a form of thermal spraying where two consumable metal wires are fed independently into the spray gun. Coating characteristics and evaluation. The droplets in this technique are minute and resemble that of water spouting out of a hose. Similar to globular transfer weld metal in the spray transfer method travels across an arc.

Selection of metallising processes 4. All involve the use of a coating material in the form of a wire rod or powder which is melted by one of the following sources of energy. Arc spray sometimes referred to as twin wire arc spray is a process that uses an electric arc to melt wires. During the twin wire arc spray process twa two wires of conductive materials are charged with opposing polarity and are fed into an arc gun at the same speed.

Along with the wire electrode a shielding gas feeds through the welding gun which shields the process from atmospheric contamination. The molten powder wire or rod is accelerated and propelled towards the substrate by gas or an atomization jet.