Arc spray manufacturer, Shanghai Qingpu arc spray equipment wholesale, arc spray retail, French dry supply
Principle of arc spray
Two continuously fed metal wires with ends at a certain angle (°~°), Connect the positive and negative poles of the DC power supply (~) respectively, and an arc will be generated at the moment when the ends of the metal wires are short-circuited. The arc melts the metal wire, and the high-speed air flow ejected from the nozzle behind the arc point atomizes the molten metal into particles, which are then sprayed onto the surface of the workpiece under the acceleration of the high-speed air flow to form a coating.
Main process parameters of arc spraying
) Spraying voltage
Spraying working voltage of commonly used materials
Materials
Working voltage/
Zinc
~< br/>Carbon steel and stainless steel
～
Aluminum
～
Nickel-based alloy
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Zinc-aluminum alloy
～
Nickel aluminum alloy
～
Aluminum magnesium alloy
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Aluminum bronze
～
) Spraying current
Generally speaking, when spraying, increase the The working current can improve production efficiency on the one hand, and improve coating quality on the other hand. However, the increase in working current also brings side effects, that is, the degree of material burning increases and the deposition efficiency decreases.
) Atomizing air pressure
Atomizing air pressure and flow rate determine to a large extent the atomization degree and flight speed of spray particles, that is, the greater the atomizing air pressure and flow rate, the greater the particle atomization. The more sufficient, the denser the resulting coating. However, excessive pursuit of finer atomization will lead to adverse consequences: the degree of oxidation of spray particles increases. As the atomizing air pressure and flow rate increase, on the one hand, the oxygen content in the air flow increases, and on the other hand, the relative surface area of the spray particles increases sharply. The combined effect of the two causes the coating to become oxidized.
) Spraying distance.
At the outlet of the arc spray gun nozzle, the flow rate of the atomized gas is large, but the speed of the molten droplets is low. As the spraying distance increases, the spray particles are gradually accelerated, and the flow rate of the atomized gas gradually decreases. Generally, spray particles have a high flight speed and temperature within a certain spray distance, making it easy to obtain high-quality coatings.
Composition of pull-type arc spraying equipment
. &QD type pull-type arc spraying gun
.QD type arc spraying power supply
Features
Mainly suitable for Φ～Φ wire materials Spray. It has the characteristics of accurate and stable wire feeding, and can be customized for special requirements.
Arc spray manufacturer, Shanghai Qingpu arc spray equipment wholesale, arc spray retail, French dry supply